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2023

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Articles 241 - 270 of 366

Full-Text Articles in Mining Engineering

A Preliminary Study On The Multiscale Effect Of Seismic Anisotropy Of Coal Seams At Long Wavelengths, Wang Yun, Zheng Yongqin, Yang Chun, Zhang Yi, Li Yingda, Zhang Huimin Apr 2023

A Preliminary Study On The Multiscale Effect Of Seismic Anisotropy Of Coal Seams At Long Wavelengths, Wang Yun, Zheng Yongqin, Yang Chun, Zhang Yi, Li Yingda, Zhang Huimin

Coal Geology & Exploration

Terrestrial coal-bearing strata in China are all typical thin interbeds given the seismic frequency bands of coal exploration. The isotropic thin interbeds are superimposed in the coal-bearing strata, exhibiting seismic anisotropy at long wavelengths among different seismic wavelengths, for which simplified equivalent processing, such as vertical transverse isotropy (VTI) or isotropy (ISO) approximation, is generally adopted in seismic exploration. However, the long-wave approximation has different applicable conditions for strata with different elastic properties. Taking the coal-bearing strata in the Huainan Coalfield as an example, this study established two-dimensional models of horizontal thin interbeds using acoustic and density logging curves of …

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Preparation And Characteristics Of Inorganic Curing Foam With Large-Volume Fly Ash In Goaf, Ma Li, Du Su, Zhang Zhaoyun, Wang Hui, Zhao Liang, Zhang Bo Apr 2023

Preparation And Characteristics Of Inorganic Curing Foam With Large-Volume Fly Ash In Goaf, Ma Li, Du Su, Zhang Zhaoyun, Wang Hui, Zhao Liang, Zhang Bo

Coal Geology & Exploration

Air leakage in the goaf of coal mine is an important cause of coal fire disaster. The traditional filling and plugging materials are easy to crack, with poor fluidity and high cost. Therefore, it is necessary to develop new materials for effective filling and plugging of the air leakage channels. Herein, the new filling and plugging material of inorganic curing foam with large-volume fly ash was developed by optimizing the mix ratio based on material fluidity, initial setting time and compressive strength using the single factor variable method. Meanwhile, the material hydration process was characterized by the infrared spectroscopy, X-ray …

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Technological Path And Geological Guarantee For Energy Storage In Underground Space Formed By Coal Mining, Sun Qiang, Zhang Weiqiang, Geng Jishi, Hu Jianjun, Zhang Yuliang, Lyu Chao, Ge Zhenlong, Li Pengfei, Jia Hailiang, Liu Yabin, Li Yuxiang Apr 2023

Technological Path And Geological Guarantee For Energy Storage In Underground Space Formed By Coal Mining, Sun Qiang, Zhang Weiqiang, Geng Jishi, Hu Jianjun, Zhang Yuliang, Lyu Chao, Ge Zhenlong, Li Pengfei, Jia Hailiang, Liu Yabin, Li Yuxiang

Coal Geology & Exploration

Coal resource is still in the main position of China’s energy structure, but the development of coal industry is facing the new challenge of “carbon peaking and carbon neutrality”. Actively developing coal underground space energy storage technology is an effective means to promote low-carbon and clean energy utilization, and also a key measure to ensure China’s energy strategic security. This study discussed the potential utilization of underground space formed by coal mining based on the current energy storage technologies. Focusing on new energy storage technologies such as underground pumped storage hydropower plants in coal mines (UPSHCM), thermal energy storage (TES), …

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Experimen On Mechanical Properties Of Various Graded Collapse Column Fills, Liu Weitao, Du Yanhui, Pang Lifu, Meng Xiangxi, Shen Jianjun, Hu Yingying Apr 2023

Experimen On Mechanical Properties Of Various Graded Collapse Column Fills, Liu Weitao, Du Yanhui, Pang Lifu, Meng Xiangxi, Shen Jianjun, Hu Yingying

Coal Geology & Exploration

In order to study the mechanical properties of collapse column fill under different consolidation pressures and grain compositions. Base on similar simulated rock-soil mass sample under different states of geotechinal consolidation test preparing, we investigated the mechanical characteristics and microstructure evolution mechanism of collapse column filling by conducting the triaxial loading test, mercury intrusion porosimetry and scanning electron microscopy in different states of rock-soil mass. The results show that the rock-soil mass has obvious shaping characteristics and the stress-strain curve can be divided into four stages: pore compaction stage, stable deformation stage, deformation failure stage and creep-like stage. The compressive …

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Evaluation On Spatiaotemporal Variations Of Mine Water Quality And Water Source Identification Based On Key Dominant Factors In Loess Hilly And Gully Region, Shi Longqing, Qu Xingyue, Han Jin Apr 2023

Evaluation On Spatiaotemporal Variations Of Mine Water Quality And Water Source Identification Based On Key Dominant Factors In Loess Hilly And Gully Region, Shi Longqing, Qu Xingyue, Han Jin

Coal Geology & Exploration

It is difficult to accurately identify the sources of water inrush between sandstone-mudstone interbedded overburden in loess hilly and gully region, and these proportions of different water sources cannot be quantified. For this reason. Based on the systematic collection of surface water and groundwater samples from Zhujiamao Coal Mine in northern Shaanxi. This study revealed the hydrochemical evolution laws of water quality and the recharge relationship of various aquifer systems by mathematical statistics, Piper (trilinear) diagram, Gibbs diagram and the conventional hydrochemical characteristic method. Meanwhile, this study analyzed the evolution characteristics of stable isotopic composition in water, clarified the spatial …

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Progress Of Research On Key Technologies For Hydrogeochemical Prospecting In North China Type Coalfield, Chen Luwang, Hu Yongsheng, Zhang Jie, Zhang Miao, Zheng Jian, Zheng Xin, Zhang Yuanyuan, Cai Xinyue, Wu Minghui Apr 2023

Progress Of Research On Key Technologies For Hydrogeochemical Prospecting In North China Type Coalfield, Chen Luwang, Hu Yongsheng, Zhang Jie, Zhang Miao, Zheng Jian, Zheng Xin, Zhang Yuanyuan, Cai Xinyue, Wu Minghui

Coal Geology & Exploration

North China type coalfield is an important coal base in China, and hydrogeochemical prospecting is an important means to solve a series of hydrogeological problems in the process of coal mining. The typical hydrogeological problems under the influence of mining were analyzed based on the generalization of the typical hydrogeological structure of North China type coalfield. Meanwhile, the multi-field coupling relationship of groundwater and the mechanism of hydrogeochemical prospecting in North China type coalfield, as well as its testing, analysis and treatment technology, were revealed. Besides, the reliability of hydrogeochemical prospecting technology in North China type coalfield was pointed out …

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Effect Of Foliar Application Of Dse Fungal Solution On Growth Of Morus Alba And Its Prospects Of Ecological Restoration Application, Bi Yinli, Wang Zhuoyou, Ke Zengming Apr 2023

Effect Of Foliar Application Of Dse Fungal Solution On Growth Of Morus Alba And Its Prospects Of Ecological Restoration Application, Bi Yinli, Wang Zhuoyou, Ke Zengming

Coal Geology & Exploration

Microbial reclamation technology has been widely used in the ecological restoration of western arid and semi-arid coal mining areas. Convenient application of microbial agent has important significance for improving the efficiency of ecological management in coal-mining subsidence. Herein, this study tested with Morus alba as the study object, and the dark septate endophyte (DSE) as the test fungus. using a greenhouse pot experiment with three treatments, which including the root inoculation of DSE fungus (GXZR), foliar application of DSE fungus (YMTM) and control Morus alba (CK), this study investigated the effects of different inoculation methods on the growth of Morus …

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Progress And Typical Case Analysis Of Demonstration Projects Of The Geological Sequestration And Utilization Of Co2, Liu Shiqi, Huang Fansheng, Du Ruibin, Chen Shiheng, Guan Yiting, Liu Yinghai, Wang Tao Apr 2023

Progress And Typical Case Analysis Of Demonstration Projects Of The Geological Sequestration And Utilization Of Co2, Liu Shiqi, Huang Fansheng, Du Ruibin, Chen Shiheng, Guan Yiting, Liu Yinghai, Wang Tao

Coal Geology & Exploration

The implementation of the geological sequestration and utilization of CO2 (CGSU) has considerable effects on CO2 emission reduction and is of great significance for the mitigation of global warming and the execution of the sustainable development strategy in China. Therefore, this study sorted the major methods for CGSU, made statistics of the global demonstration projects of CGSU, and primarily introduced the typical demonstration projects of CGSU in China. Furthermore, this study proposed prospects for the development trend of the CGSU technologies, which primarily include CO2 enhanced oil recovery (CO2-EOR), CO2 enhanced coalbed methane recovery …

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Evaluation Method Of Resistance To Seepage Failure Due To Mining Near Unconsolidated Aquifers I: Critical Hydraulic Gradient, Sui Wanghua Apr 2023

Evaluation Method Of Resistance To Seepage Failure Due To Mining Near Unconsolidated Aquifers I: Critical Hydraulic Gradient, Sui Wanghua

Coal Geology & Exploration

The evaluation on resistance to seepage failure is an important fundamental work for the prevention and control of water-sand mixture inrush during coal mining near the unconsolidated aquifers. However, no normative methods and standards have been developed at present. The key to evaluate the resistance to seepage failure of unconsolidated aquifers and weathered zones is to determine their hydraulic gradient and the critical hydraulic gradient. Herein, this study reviewed the determination method of critical hydraulic gradient for soil flow and internal erosion, and pointed out the different characteristics between the critical hydraulic gradient for water-sand mixture inrush near unconsolidated aquifers …

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Micro-Mechanism Of Geological Sequestration Of Co2 In Coal Seam, Yao Yanbin, Sun Xiaoxiao, Wan Lei Apr 2023

Micro-Mechanism Of Geological Sequestration Of Co2 In Coal Seam, Yao Yanbin, Sun Xiaoxiao, Wan Lei

Coal Geology & Exploration

The geological sequestration of CO2 in coal seam is a most promising carbon storage technology, which can help achieve the dual goals of CO2 emission reduction and coalbed methane stimulation. Compared with other sealing geological bodies, coal has extremely well-developed micropores. The mechanism of geological sequestration of CO2 in coal seam is closely related to the interaction of coal-gas-water. However, its internal influence mechanism is still unclear. Herein, the models of macromolecular structure and plat pore of the coals were constructed based on the systematic coal petrological analysis and testing of two bituminous coal samples. Meanwhile, the …

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Characteristics And Formation Mechanisms Of Microstructures In Coal Treated With Co2 Phase Transition Fracturing, Cao Yunxing, Zhang Xinsheng, Zhang Junsheng, Guo Shuaifang, Meng Bingbing Apr 2023

Characteristics And Formation Mechanisms Of Microstructures In Coal Treated With Co2 Phase Transition Fracturing, Cao Yunxing, Zhang Xinsheng, Zhang Junsheng, Guo Shuaifang, Meng Bingbing

Coal Geology & Exploration

CO2 phase transition fracturing (CPTF) is a newly developed technique for coal mine gas control and is characterized by high efficiency, high coal seam permeability, a high gas drainage rate, and outburst elimination. The core of CPTF is reinforced fracturing and the pressure-relief and permeability-enhancement effects of coal seams under high-pressure dynamic loading. Nevertheless, there is a lack of studies on the morphological characteristics and formation mechanisms of newly formed fractures. Current observation and description of the underground fractures on a centimeter-meter scale primarily aim to reveal the fracturing and permeability-enhancement mechanisms of low-permeability coal seams. However, the study …

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Structure Optimization And Coal Breaking Effect Of Air Jet Nozzle For Post-Mixed Abrasive, Yang Heng, Wei Jianping, Cai Yubo, Zhang Lulu, Liu Yong Apr 2023

Structure Optimization And Coal Breaking Effect Of Air Jet Nozzle For Post-Mixed Abrasive, Yang Heng, Wei Jianping, Cai Yubo, Zhang Lulu, Liu Yong

Coal Geology & Exploration

Hydraulic pressure relief and penetration enhancement technology plays an important role in coal seam gas hozard control, but it is easy to lead to dynamic phenomena such as hole collapse, drill holding and hole spraying during its application in the soft coal seams. Non-hydraulic pressure relief and penetration enhancement is one of the feasible technologies to break through the bottleneck of efficient gas extraction technology in soft coal seams. To this end, the post-mixed abrasive air jet coal breaking and pressure relief technology was proposed with the efficient coal breaking capability of abrasive air jet. Specifically, the abrasive and air …

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Structural Characteristics Of Adsorption Pores In Low-Rank Coals And Their Effects On Methane Adsorption Performance, Li Shugang, Zhou Yuxuan, Hu Biao, Qin Xueyan, Kon Xiangguo, Bai Yang, Zhang Jingfei Apr 2023

Structural Characteristics Of Adsorption Pores In Low-Rank Coals And Their Effects On Methane Adsorption Performance, Li Shugang, Zhou Yuxuan, Hu Biao, Qin Xueyan, Kon Xiangguo, Bai Yang, Zhang Jingfei

Coal Geology & Exploration

The study of the CH4 adsorption characteristics of low-rank coals is of great significance for gas content prediction, gas drainage, and hazard prevention. Therefore, this study selected six typical low-rank coal samples from coal mines in Shaanxi Province, on which low-temperature N2 adsorption experiments, low-pressure CO2 adsorption experiments, and CH4 isothermal adsorption experiments were carried out. As a result, the structural characteristics of adsorption pores in low-rank coals were obtained. Moreover, this study quantitatively characterized the relationships between the parameters of CH4 adsorption characteristics and those of adsorption pore structure using the micropore filling and …

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An Evaluation Method For Geological Dynamic Environments Of Mines And The Classification Of Mines Subjected To Rock Bursts, Lan Tianwei, Zhang Zhijia, Yuan Yongnian, Han Jun, Liu Hongquan, Zhang Junjie, Zhang Hongwei, Luo Boyuan, Liu Mingwei Apr 2023

An Evaluation Method For Geological Dynamic Environments Of Mines And The Classification Of Mines Subjected To Rock Bursts, Lan Tianwei, Zhang Zhijia, Yuan Yongnian, Han Jun, Liu Hongquan, Zhang Junjie, Zhang Hongwei, Luo Boyuan, Liu Mingwei

Coal Geology & Exploration

The occurrence of dynamic disasters in mines, such as rock bursts, is affected by multiple factors and is the result of the coupling of the natural geological dynamic environment and mining engineering disturbances. The characteristics of rock bursts including their time, space, and intensity are related to the regional geological dynamic environment of mines. Different coal fields, mining areas, and mines have different regional geological dynamic environments. Accordingly, some coal mines do not have a geological dynamic environment of rock bursts, while some are subjected to different types of rock bursts. This study proposed an evaluation method for the geological …

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Coal And Gas Outburst Mechanism: Research Progress And Prospect In China Over The Past 70 Years, Zhang Chaolin, Wang Peizhong, Wang Enyuan, Xu Jiang, Li Zhonghui, Liu Xiaofei, Peng Shoujian Apr 2023

Coal And Gas Outburst Mechanism: Research Progress And Prospect In China Over The Past 70 Years, Zhang Chaolin, Wang Peizhong, Wang Enyuan, Xu Jiang, Li Zhonghui, Liu Xiaofei, Peng Shoujian

Coal Geology & Exploration

The effective prevention and control of coal and gas outbursts have always been a challenge for safe coal mining in China, and their prerequisite and basis are in-depth research on the coal and gas outburst mechanism. This study expatiated the efforts and achievements of China made in research on the coal and gas outburst mechanism over the past 70 years, which can be divided into four stages, namely active exploration (1955‒1977), the establishment of the theoretical foundation (1978‒2002), rapid development (2003‒2015), and stable development (2016 to the present). This study explored the hot research topics and frontier trends of the …

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Characteristics And Coal-Controlling Effects Of Structures In The Zhundong Coalfield, Wang Meng, Ma Ruying, Shan Yadi, Yan Yichao Apr 2023

Characteristics And Coal-Controlling Effects Of Structures In The Zhundong Coalfield, Wang Meng, Ma Ruying, Shan Yadi, Yan Yichao

Coal Geology & Exploration

The coal controlling of structures is critical to mining safety. However, few studies have been conducted on the structures of the Zhundong coalfield according to existing data. To ensure safe and efficient coal mining, it is necessary to conduct a study targeting the geological conditions for the coal mining of the coalfield. This study investigated the structural characteristics of the Zhundong coalfield. Based on the statistics of the fault structures, this study quantitatively characterized the structural complexity of the coalfield using fractal dimension, explored the current structural characteristics and tectonic dynamic genesis of the structures in Zhundong coalfield, and analyzed …

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The Toxicology Of Particulate Matter Emitted From Coal Combustion And The Geological Origin Of Lung Cancer Epidemic In Xuanwei City, Yunan Province, China, Shao Longyi, Zhang Mengyuan, Feng Xiaolei, Jiao Jiewei, Wang Wenhua, Zhou Yiping Apr 2023

The Toxicology Of Particulate Matter Emitted From Coal Combustion And The Geological Origin Of Lung Cancer Epidemic In Xuanwei City, Yunan Province, China, Shao Longyi, Zhang Mengyuan, Feng Xiaolei, Jiao Jiewei, Wang Wenhua, Zhou Yiping

Coal Geology & Exploration

Xuanwei City in Yunnan Province is the area struck by the most severe lung cancer in China, with the incidence and mortality of lung cancer ranking first in the world. The study of genomics of lung cancer patients has shown that lung cancer in Xuanwei City has distinctive genetic characteristics and a unique incidence mode related to the environment. This study reviewed the epidemiological characteristics of the lung cancer epidemic in Xuanwei, as well as the level of pollution and toxicological characteristics of emissions from coal combustion. Moreover, this study discussed the geological origins of the lung cancer epidemic in …

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Orientation And Major Research Problems Of Coal Geological Exploration In China Under New Conditions, Wang Tong, Han Xiaozhong, Deng Jun, Sun Yajun, Li Zengxue, Tang Shuheng, Mao Shanjun, Lin Zhongyue, Li Congcong, Zhao Xin, Sun Jie, Song Hongzhu, Zhang Biao, Meng Fanbin, Wu Zhaojian, Deng Xiaoli, Jiang Tao Apr 2023

Orientation And Major Research Problems Of Coal Geological Exploration In China Under New Conditions, Wang Tong, Han Xiaozhong, Deng Jun, Sun Yajun, Li Zengxue, Tang Shuheng, Mao Shanjun, Lin Zhongyue, Li Congcong, Zhao Xin, Sun Jie, Song Hongzhu, Zhang Biao, Meng Fanbin, Wu Zhaojian, Deng Xiaoli, Jiang Tao

Coal Geology & Exploration

Coal is a major energy source in China and an important raw material in the coal chemical industry in the country. Over the past 70 years since the founding of New China, coal geological exploration has been carried out in close combination with the national strategic demand, discovering the urgently needed coal resources for the country and ensuring the sufficient supply of national coal energy. This paper systematically summarizes the primary achievements made in coal geological surveys in recent years, analyzes the major research problems with the development of coal geological exploration under the current new conditions, and positions coal …

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Geothermal Energy Exploitation And Storage In Coal Field Under The Dual Carbon Goal, Wang Jiyang, Kong Yanlong, Duan Zhongfeng, Zhang Jixiong, Luo Xilian, Huang Yonghui, Luo Naning, Cheng Yuanzhi, Zhou Nan, Zhang Weizun, Pang Zhonghe Apr 2023

Geothermal Energy Exploitation And Storage In Coal Field Under The Dual Carbon Goal, Wang Jiyang, Kong Yanlong, Duan Zhongfeng, Zhang Jixiong, Luo Xilian, Huang Yonghui, Luo Naning, Cheng Yuanzhi, Zhou Nan, Zhang Weizun, Pang Zhonghe

Coal Geology & Exploration

The development of geothermal energy in coalfield can not only improve the temperature environment of coal mining, but also turn waste into treasure through the clean utilization of geothermal energy. Especially, it is of great prospect to store energy in the mined-out area of coalfield under the “dual carbon” goal at present. Herein, in this paper, it was estimated that the geothermal reserves in the main coal-bearing areas of China were 1.12 × 1019 kJ, equivalent to 379.539 billion tons of standard coal, and the recoverable geothermal reserves were 1.71 × 1018 kJ, equivalent to 56.931 billion tons …

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Infrasound Detection Of Approaching Lahars, J B. Johnson, A Roca, A Pineda, R Mérida, R. Escobar-Wolf, J F. Anderson, J Mock, A Bosa, G Bejar, G. P. Waite Apr 2023

Infrasound Detection Of Approaching Lahars, J B. Johnson, A Roca, A Pineda, R Mérida, R. Escobar-Wolf, J F. Anderson, J Mock, A Bosa, G Bejar, G. P. Waite

Michigan Tech Publications, Part 1

Infrasound may be used to detect the approach of hazardous volcanic mudflows, known as lahars, tens of minutes before their flow fronts arrive. We have analyzed signals from more than 20 secondary lahars caused by precipitation events at Fuego Volcano during Guatemala's rainy season in May through October of 2022. We are able to quantify the capabilities of infrasound monitoring through comparison with seismic data, time lapse camera imagery, and high-resolution video of a well-recorded event on August 17. We determine that infrasound sensors, deployed adjacent to the lahar path and in small-aperture (10 s of meters) arrays, are particularly …

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Review Of Current Coal Rib Control Practices, Dogukan Guner, Samuel Nowak, Taghi Sherizadeh, Maurice Sunkpal, Khaled Mohamed, Yuting Xue Apr 2023

Review Of Current Coal Rib Control Practices, Dogukan Guner, Samuel Nowak, Taghi Sherizadeh, Maurice Sunkpal, Khaled Mohamed, Yuting Xue

Mining Engineering Faculty Research & Creative Works

The instability of coal ribs in underground mines continues to result in the injuries and fatalities of mine workers. The proper estimation and evaluation of primary and secondary support for coal ribs is still a challenging problem in the field of ground control science and requires further research and study. Although mining operations have various support design criteria and support methodologies for strata control, most rib support designs are still based on experience and local practices. This review study is intended to summarize the currently applied practices for rib support and control in various countries and mining conditions. Firstly, critical …

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Review Of Current Coal Rib Control Practices, Dogukan Guner, Samuel Nowak, Taghi Sherizadeh, Maurice Sunkpal, Khaled Mohamed, Yuting Xue Apr 2023

Review Of Current Coal Rib Control Practices, Dogukan Guner, Samuel Nowak, Taghi Sherizadeh, Maurice Sunkpal, Khaled Mohamed, Yuting Xue

Mining Engineering Faculty Research & Creative Works

The instability of coal ribs in underground mines continues to result in the injuries and fatalities of mine workers. The proper estimation and evaluation of primary and secondary support for coal ribs is still a challenging problem in the field of ground control science and requires further research and study. Although mining operations have various support design criteria and support methodologies for strata control, most rib support designs are still based on experience and local practices. This review study is intended to summarize the currently applied practices for rib support and control in various countries and mining conditions. Firstly, critical …

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Review Of Current Coal Rib Control Practices, Dogukan Guner, Samuel Nowak, Taghi Sherizadeh, Maurice Sunkpal, Khaled Mohamed, Yuting Xue Apr 2023

Review Of Current Coal Rib Control Practices, Dogukan Guner, Samuel Nowak, Taghi Sherizadeh, Maurice Sunkpal, Khaled Mohamed, Yuting Xue

Mining Engineering Faculty Research & Creative Works

The instability of coal ribs in underground mines continues to result in the injuries and fatalities of mine workers. The proper estimation and evaluation of primary and secondary support for coal ribs is still a challenging problem in the field of ground control science and requires further research and study. Although mining operations have various support design criteria and support methodologies for strata control, most rib support designs are still based on experience and local practices. This review study is intended to summarize the currently applied practices for rib support and control in various countries and mining conditions. Firstly, critical …

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Diagnostic Gold Deportment Studies And Leaching Behaviour Of Small-Scale Gold Mining Tailings From Eastern Region, Ghana, Ishmael Quaicoe, Martin Beyuo, Solomon Quaicoe, Nikao A. Lasidzi Mar 2023

Diagnostic Gold Deportment Studies And Leaching Behaviour Of Small-Scale Gold Mining Tailings From Eastern Region, Ghana, Ishmael Quaicoe, Martin Beyuo, Solomon Quaicoe, Nikao A. Lasidzi

Journal of Sustainable Mining

Artisanal and small-scale gold mining (ASGM) sector employs about 80% of the mining workforce but only contributes about 20-30% of Ghana’s gold production. The low gold production is linked to low recoveries associated with the activities because ofinadequate understanding of the chemical, mineralogical and metallurgical characteristics of the ores. This study examined the metallurgical characteristics of typical small-scale gold mining tailings to understand their grinding characteristics, gold deportment and cyanidation behaviour. The gold deportment results showed that 96.1% of the gold in the samples is free milling (can be leached directly with cyanide and recovered through carbon adsorption), whilst the …

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Research On Aquifer Water Abundance Evaluation By Borehole Transient Electromagnetic Method Based On Fcnn, Cheng Jiulong, Wang Huijie, Xu Zhongzhong, Huang Qisong, Jiang Guoqing Mar 2023

Research On Aquifer Water Abundance Evaluation By Borehole Transient Electromagnetic Method Based On Fcnn, Cheng Jiulong, Wang Huijie, Xu Zhongzhong, Huang Qisong, Jiang Guoqing

Coal Geology & Exploration

Predicting the location and water abundance of aquifers by drilling or geophysical methods before tunneling is very important to prevent water disasters in advance for the safety of coal mine production. The use of borehole transient electromagnetic method (BTEM) for advanced detection has obvious advantages. At present, the interpretation method is based on the calculated resistivity to qualitatively analyze rock water abundance, and it is impossible to predict the aquifer water abundance grade. So, the fully convolutional neural network (FCNN) method is proposed to predict the aquifer water abundance grade for BTEM. Firstly, according to the Archie formula, Kozeny-Carman formula, …

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Challenges And Solutions To High-Resolution Data Processing For Seismic Exploration, Cao Siyuan, Sun Yaoguang, Chen Siyuan Mar 2023

Challenges And Solutions To High-Resolution Data Processing For Seismic Exploration, Cao Siyuan, Sun Yaoguang, Chen Siyuan

Coal Geology & Exploration

The seismic resolution has long been limited to the quarter wavelength. To compress the seismic wavelet, the key problems are signal-to-noise ratio (SNR) and resolution in early stages, and high resolution and high fidelity in late stages. Meanwhile, by using well data, many inversion methods of spanning quarter wavelength have been developed. The success of these methods depends on the preservation of seismic wave amplitude, the accuracy of seismic interpretation, and the compatibility between well data and seismic data. Afterward, researchers achieved seismic inversion without well data constraint, and the corresponding resolution reached the level of reflectivity. Meanwhile, the key …

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Research Status And Development Trend Of Mine Electrical Prospecting, Yue Jianhua, Yang Haiyan, Ran Huageng Mar 2023

Research Status And Development Trend Of Mine Electrical Prospecting, Yue Jianhua, Yang Haiyan, Ran Huageng

Coal Geology & Exploration

Transparency of hidden geological factors is critical to intelligent and precise coal mining and therefore the prevention and control of major accidents in coal mine. The significant electrical property change can be resulted from several factors, such as the structure of coal and rock mass, the fluid occurrence, etc., providing a basis of physical property for mine electrical prospecting. For more than 30 years, mine electrical prospecting has played a key role to water prevention and control of coal mine in China. Definitely, many symbolized results on theory, technique and application of mine electrical prospecting have been produced through several …

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From 1d To 4d: Advances And Thoughts On Coal Seismic Technology, Cheng Jianyuan, Zhang Xianxu, Jiang Bici, Wang Pan, Shan Rui Mar 2023

From 1d To 4d: Advances And Thoughts On Coal Seismic Technology, Cheng Jianyuan, Zhang Xianxu, Jiang Bici, Wang Pan, Shan Rui

Coal Geology & Exploration

As one of the key technologies for safe and efficient support of coalmine geology, the seismic technology, has gone through one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D), and progressed from resource exploration to mining area exploration, and from structural exploration to lithological exploration. The latest 4D seismic will further leapfrog from static detection to dynamic detection. Based on the concepts of time-space dimensions and the four seismic development stages, we propose three transitional stages from 1.5D (e.g., non-zero offset VSP), 2.5D (e.g., wide line 2D seismic exploration) to 3.5D (e.g., 3D seismic dynamic interpretation), and also present the time-space characteristics …

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Simulation Test On Water-Rock Interaction In Coal Mine Goaf, Sun Yajun, Zhao Xianming, Xu Zhimin, Guo Juan, Zhang Li, Chen Ge, Chen Tianci, Zhu Lulu, Gao Yating, Chen Weiyang Mar 2023

Simulation Test On Water-Rock Interaction In Coal Mine Goaf, Sun Yajun, Zhao Xianming, Xu Zhimin, Guo Juan, Zhang Li, Chen Ge, Chen Tianci, Zhu Lulu, Gao Yating, Chen Weiyang

Coal Geology & Exploration

Water accumulation is widely present in the goaf of coal mine in China. It is of great significance to clarify the water-rock interaction mechanism in the closed and semi-closed goaf environment for water pollution reduction and groundwater resource protection in coal mine area. Taking the water accumulation in the goaf of a coal mine in Inner Mongolia as the research object, we designed a box simulation test to highly restore the goaf environment. X-ray diffractometer (XRD) and X-ray fluorescence spectrometer (XRF) were used to analyze the mineral composition and element composition of the simulated filler of goaf (coal and caving …

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Domestic And Foreign Progress Of Mine Water Treatment And Resource Utilization, Wang Hao, Dong Shuning, Shang Hongbo, Wang Tiantian, Yang Jian, Zhao Chunhu, Zhang Quan, Zhou Zhenfang, Liu Ji, Hou Yue Mar 2023

Domestic And Foreign Progress Of Mine Water Treatment And Resource Utilization, Wang Hao, Dong Shuning, Shang Hongbo, Wang Tiantian, Yang Jian, Zhao Chunhu, Zhang Quan, Zhou Zhenfang, Liu Ji, Hou Yue

Coal Geology & Exploration

The treatment and resourceful utilization of mine water is an important thrust to achieve the dual goals of high-quality development of coal industry and ecological civilization construction in mining area. The decision to effectively treat and use mine water as an unconventional water resource will inevitably be made in the future due to the restrictions of a global water resource deficit and ecological environment protection. From the standpoint of the quality features of mine water in various mining sites, the formation mechanism and evaluation techniques of mine water quality were completely detailed here. Meanwhile, there were two stages in the …

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