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Full-Text Articles in Engineering

Key Technology Of Automatic Loading And Unloading System For Dual-Pipe Directional Drilling Rig And Its Application In Soft–Fragmentized Coal Seam, Li Kun, Ting Ren, Yao Yafeng Apr 2023

Key Technology Of Automatic Loading And Unloading System For Dual-Pipe Directional Drilling Rig And Its Application In Soft–Fragmentized Coal Seam, Li Kun, Ting Ren, Yao Yafeng

Coal Geology & Exploration

To improve the automatic level and efficiency of loading and unloading of drilling rigs during the construction of dual-pipe directional drilling, an automatic loading and unloading device of dual pipe was developed to realize the fully automatic loading and unloading of drilling rigs under different working conditions and to solve the technical problems of loading and unloading the drill pipes and casing simultaneously during the dual-pipe directional drilling. Meanwhile, the device structure and control system was designed to restrict the load applied to the device during construction with the end-compliant technique. Besides, the key boundary conditions of the control program …

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Effects Of Mos2 On The Matrix Performance Of Hot-Pressed Fe-Based Diamond Drill Bit, Zhang Wenjiao, Tan Songcheng, Pan Bingsuo, Jin Xin, Kong Xiangqing, Long Shanglin Apr 2023

Effects Of Mos2 On The Matrix Performance Of Hot-Pressed Fe-Based Diamond Drill Bit, Zhang Wenjiao, Tan Songcheng, Pan Bingsuo, Jin Xin, Kong Xiangqing, Long Shanglin

Coal Geology & Exploration

Diamond drill bit is a common rock breaking tool in various exploration works, but the diamond in drill bit has poor thermal stability. As heat is constantly generated during the drilling process, the self-cooling of diamond drill bit under the condition of drought and water shortage is very important to improve the drilling efficiency. In order to decrease the friction coefficient between bit matrix and rock interface under dry drilling condition and reduce the thermal damage of diamond during drilling, molybdenum disulfide (MoS2) was added into the Fe-based diamond bit matrix, and research was performed for the effects …

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Study On Construction Of Microbial Solid-Free Drilling Fluid System And Its Borehole Wall Enhancement Mechanism, Li Zhijun, Zhu Mao, Zhi Jingzi, Han Yi, Chen Junxiu, Zhao Gan Apr 2023

Study On Construction Of Microbial Solid-Free Drilling Fluid System And Its Borehole Wall Enhancement Mechanism, Li Zhijun, Zhu Mao, Zhi Jingzi, Han Yi, Chen Junxiu, Zhao Gan

Coal Geology & Exploration

Broken formations are often encountered during drilling, which is prone to the instability of wellbore wall and induces serious downhole accidents. Enhancing the cementing force between the broken blocks and improving the mechanical strength of the surrounding rocks of a wellbore is one of the effective ways to solve the instability of wellbore in this type of formation, for which the microbially induced calcite precipitation (MICP) technology provides a good reference. To this end, the growth of Bacillus pasteurii in the solid-free drilling fluid system was analyzed through experimental study, and thus a solid-free drilling fluid suitable for its growth …

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Table Of Contents, The Editors Apr 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Effect Of Amf-Maize Combination On Water And Salt Distribution In Soil Under The Dump Reconstruction Mode Of “Topsoil-Aquifer-Aquitard”, Bi Yinli, Yang Wei, Ke Zengming, Wu Chao, Li Mingchao, Xue Chao Apr 2023

Effect Of Amf-Maize Combination On Water And Salt Distribution In Soil Under The Dump Reconstruction Mode Of “Topsoil-Aquifer-Aquitard”, Bi Yinli, Yang Wei, Ke Zengming, Wu Chao, Li Mingchao, Xue Chao

Coal Geology & Exploration

The distribution of soil water and salt severely affects the ecological reconstruction and plant configuration modes at coal mine dumps. To investigate the characteristics of soil water and salt distribution under the three-layer reconstruction mode of “topsoil-aquifer-aquitard” in coal mine dump under the influence of mycorrhizal plants, laboratory soil column test was conducted, in which the soil was treated in three ways: planting maize and inoculating with arbuscular mycorrhizal fungi (YM+AMF), planting maize (YM) only, and no planting of maize + no inoculation with bacteria (CK). The results showed that: (1) The different treatments have no significant effect on the …

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Effects Of Actinomycetes On Root Growth Of Onobrychis Viciaefolia And Rhizosphere Soil Fertility In Dumping Site Of Open-Pit Mine In Arid Area, Cao Shumiao, Wang Qiangmin, Yang Fan, Yang Jian, Zhang Haihan, Xu Ganggang, Zhu Shibin Apr 2023

Effects Of Actinomycetes On Root Growth Of Onobrychis Viciaefolia And Rhizosphere Soil Fertility In Dumping Site Of Open-Pit Mine In Arid Area, Cao Shumiao, Wang Qiangmin, Yang Fan, Yang Jian, Zhang Haihan, Xu Ganggang, Zhu Shibin

Coal Geology & Exploration

In order to resolve the issue of soil degradation in the dumping site of open-pit coal mine in arid area, the effects of actinomycetes on the root growth and rhizosphere soil fertility of onobrychis viciaefolia in the dumping site of Xinjiang Heishan Open-pit Coal Mine were investigated by highly efficient actinomycete inoculation and in-situ pot experiment. The results show that: (1) Under the drought conditions, actinomycetes inoculation could significantly promote the development of root morphology and the growth of onobrychis viciaefolia. Compared with the control without actinomycetes inoculation, the total root length, average root diameter, root surface area and …

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Progress And Reflection Of Intelligent Geological Guarantee Technology In Coal Mining Face, Wang Guofa, Zhang Jianzhong, Xue Guohua, Liu Zaibin, Liu Qing, Li Mei, Liu Junfeng, Cheng Jian, Zhang Xueliang Apr 2023

Progress And Reflection Of Intelligent Geological Guarantee Technology In Coal Mining Face, Wang Guofa, Zhang Jianzhong, Xue Guohua, Liu Zaibin, Liu Qing, Li Mei, Liu Junfeng, Cheng Jian, Zhang Xueliang

Coal Geology & Exploration

Coal mine geological guarantee technology is the key path to achieve accurate and green coal mining. In view of the requirements of intelligent mining and geological guarantee, the main problems faced by the geological guarantee of the mining face were analyzed, mainly including the weak basic theoretical research, insufficient geological exploration accuracy, modeling accuracy unable to meet the engineering application, difficulties in model dynamic updating, and lack of optimal decision-making means for global path of intelligent mining based on spatio-temporal evolution. According to the faced difficulties and technical status, the author explored and practiced the geological guarantee technology of intelligent …

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Electromagnetic Methods In The Detection Of Water Hazards In Coal Mines: A Review, Zhang Jifeng, Sun Naiquan, Liu Zuiliang, Qi Zhipeng Apr 2023

Electromagnetic Methods In The Detection Of Water Hazards In Coal Mines: A Review, Zhang Jifeng, Sun Naiquan, Liu Zuiliang, Qi Zhipeng

Coal Geology & Exploration

Water hazards in coal mines are a major type of hidden danger in safe coal mining. The accurate detection of hidden factors to cause hazard is the prerequisite to solving the water hazards. Electromagnetic methods, which are sensitive to low-resistivity bodies and have multiple types and high adaptability, can be used to effectively detect water-rich hazard-causing factors. Traditional ground electromagnetic methods, including the controlled source audio-frequency magnetotellurics (CSAMT) method and the loop source transient electromagnetic method, play an important role in detecting hidden hazard-causing factors in coal mines. With the continuous development of new technologies, near-source electromagnetic methods have developed …

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A Review On Research Of Reflected In-Seam Wave Detection Technology In Coal Mine, Wang Ji, Ye Hongxing, Zhang Guangzhong, Li Gang, Wu Guoqing, Niu Huan, Yang Yanjun, Guan Qi Apr 2023

A Review On Research Of Reflected In-Seam Wave Detection Technology In Coal Mine, Wang Ji, Ye Hongxing, Zhang Guangzhong, Li Gang, Wu Guoqing, Niu Huan, Yang Yanjun, Guan Qi

Coal Geology & Exploration

Reflected in-seam wave can be used in one roadway to detect the abnormal geological structures such as faults in some area on both sides of the roadway or in front of tunneling. In this paper, the data and processing method of the reflected in-seam wave were compared based on the 2 different detection areas on side of the roadway and in front of tunneling. In particular, the technical principles, applicable conditions and research progress of three imaging methods of reflected in-seam wave were analyzed and sorted out, including the stack imaging, migration imaging and advance imaging of tunneling face. Besides, …

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Detection Of Change In The Coal Thickness Of A Fully Mechanized Mining Face Based On Electromagnetic Wave Penetration, Wu Rongxin, Li Xiang, Xiao Yulin Apr 2023

Detection Of Change In The Coal Thickness Of A Fully Mechanized Mining Face Based On Electromagnetic Wave Penetration, Wu Rongxin, Li Xiang, Xiao Yulin

Coal Geology & Exploration

A fully mechanized mining face tend to show great change in coal thickness, which affects the safe, efficient coal mining. Therefore, it is necessary to detect the change in the coal thickness before stoping. To determine the response of electromagnetic (EM) wave penetration to the change in the coal thickness, this study established a three-dimensional model of fully mechanized mining faces using simulation software. On this basis, this study simulated the change in the coal thickness under different ratios of the coal-to-rock resistivity based on EM wave penetration. The results are as follows: (1) With a decrease in the coal …

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Development Status And Trend Of High-Density 3d Seismic Exploration Technology For Coal Fields, Dong Shouhua, Huang Yaping, Jin Xueliang, Yang Guangming, Nie Ailan, Qi Xuemei, Cheng Yan, Wu Haibo Apr 2023

Development Status And Trend Of High-Density 3d Seismic Exploration Technology For Coal Fields, Dong Shouhua, Huang Yaping, Jin Xueliang, Yang Guangming, Nie Ailan, Qi Xuemei, Cheng Yan, Wu Haibo

Coal Geology & Exploration

Traditional 3D seismic exploration in coal mining areas is difficult to meet the requirements of transparent and accurate geological exploration for safe and efficient coal mining due to its low precision for complex structures, lower coal seams, and limestones. In this case, high-density 3D seismic exploration technology for coal fields emerged. This technology has undergone three developmental stages in China, namely the exploration and test stage during 2005‒2007, the test and demonstration stage during 2008‒2014, and the promotion and application stage since 2015. After nearly 20 years of development, its accuracy for the exploration of complex geological structures has been …

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Source And Release Law Of Fluorine In Water-Rock System Of Coal Mine Goaf In Contiguous Area Of Shaanxi And Inner Mongolia, Wang Tiantian, Jin Dewu, Xue Jiankun, Ji Hongying, Shang Hongbo, Zhou Zhenfang, Yang Jian, Cao Yu Apr 2023

Source And Release Law Of Fluorine In Water-Rock System Of Coal Mine Goaf In Contiguous Area Of Shaanxi And Inner Mongolia, Wang Tiantian, Jin Dewu, Xue Jiankun, Ji Hongying, Shang Hongbo, Zhou Zhenfang, Yang Jian, Cao Yu

Coal Geology & Exploration

The coal mine goaf is the key area for the formation of high-fluoride mine water, and the source and release of fluorine in goaf water-rock system determines the enrichment or depletion of fluorine in mine water. Aiming at the unclear source and release rule of fluorine in the mine water of 3-1 coal goaf in the contiguous area of Shaaxi and Inner Mongolia, hydrochemical test, mineral composition analysis, mineral scanning electron microscopy and energy spectrum detection, as well as laboratory water-rock simulation experiment, were conducted to determine the source and occurrence carrier of fluorine in coal mine water, and to …

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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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