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2023

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Articles 271 - 300 of 366

Full-Text Articles in Mining Engineering

Cause, Countermeasures And Solutions Of Water Hazards In Coal Mines In China, Yin Shangxian, Wang Yuguo, Li Wensheng Mar 2023

Cause, Countermeasures And Solutions Of Water Hazards In Coal Mines In China, Yin Shangxian, Wang Yuguo, Li Wensheng

Coal Geology & Exploration

In the new century, the coal industry has experienced a decade of rapid development, and the coal output has been stabilized at about 4.5 billion tons. The coal mine safety situation is generally good, with the multiple, frequent and even catastrophic accidents reduced, the major accidents at sometimes developed to be single and occasional, and the extraordinarily serious accidents were controlled effectively. Water hazard of mine is still the main type of coal mine hazards in China, and it is the second largest lethal reason after gas hazard. The analysis shows that the complex mining environment and the insufficient attention …

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Characteristics Of Roof Water Hazard Of Coal Seam In Huanglong Coalfield And Key Technologies For Prevention And Control, Jin Dewu, Li Chaofeng, Liu Yingfeng, Cao Haitao, Ren Dengjun, Wang Hongliang,, Zhang Jinkui, Huang Yang, Yang Guodong, Guo Kang, Fan Min, Liu Chenkai Mar 2023

Characteristics Of Roof Water Hazard Of Coal Seam In Huanglong Coalfield And Key Technologies For Prevention And Control, Jin Dewu, Li Chaofeng, Liu Yingfeng, Cao Haitao, Ren Dengjun, Wang Hongliang,, Zhang Jinkui, Huang Yang, Yang Guodong, Guo Kang, Fan Min, Liu Chenkai

Coal Geology & Exploration

Huanglong Coalfield in Shaanxi is one of the main coal production bases in China. Coal mining is usually affected by the sandstone water of the thick Luohe Formation on the roof, resulting a significant difficulty in the prevention and control of water hazards. It is therefore of great importance to correctly analyze the characteristics of water inflow from the roof and successfully develop the key technologies for water hazard prevention and control, ensuring the safe production of coal mines. The types of roof water hazard and its main controlling factors were appropriately analyzed by collecting the information on water inflow …

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Theoretical Framework And Key Technology Of Advance Regional Control Of Water Inrush In Coal Seam Floor, Dong Shuning, Liu Qisheng, Wang Hao, Guo Xiaoming, Liu Zhaoxing, Zheng Shitian, Nan Shenghui, Liu Jianlin, Zhao Zhao, Shi Zhiyuan Mar 2023

Theoretical Framework And Key Technology Of Advance Regional Control Of Water Inrush In Coal Seam Floor, Dong Shuning, Liu Qisheng, Wang Hao, Guo Xiaoming, Liu Zhaoxing, Zheng Shitian, Nan Shenghui, Liu Jianlin, Zhao Zhao, Shi Zhiyuan

Coal Geology & Exploration

The shallow coal resources in North China have been nearly depleted so far, whereas deep coal development is challenged by karst water inrush in floor limestone. The conventional underground vertical hole grouting methods are troubled with inappropriate site location, thin drilling-met aquifer, large grouting blind area, and inaccurate target location. For this reason, we propose an advance regional control technology: bedding directional drilling-based grouting. We systematically study the slurry flow from near-horizontal grouting holes, advance grouting modes, grouting parameter control, advance identification of potential water diversion channels, as well as validation and assessment of a grouting treatment. On this basis, …

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Technological System Of Water-Conserving Coal Mining, Fan Limin, Sun Qiang, Ma Liqiang, Li Tao, Chen Haifu, Jiang Zequan Mar 2023

Technological System Of Water-Conserving Coal Mining, Fan Limin, Sun Qiang, Ma Liqiang, Li Tao, Chen Haifu, Jiang Zequan

Coal Geology & Exploration

The research on water-conserving coal mining is the theoretical basis of water resource protection and high-quality development of coal in the ecologically vulnerable mining areas in northwest of our country. In view of the impact and damage on aquifer and ecosystem in ecologically vulnerable mining areas due to intensive mining activities in northwest China, the development process and scientific connotation of water-conserving coal mining was expounded herein. Specifically, the research on water-conserving coal mining has gone through four stages: initiation, formation, development and maturation, and a relatively perfect technological system has been formed at present, which is mainly reflected in …

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Experimental Study On Co2-Enhanced Coalbed Methane Production And Its Simultaneous Storage, Su Xianbo, Huang Jin, Wang Qian, Yu Shiyao Mar 2023

Experimental Study On Co2-Enhanced Coalbed Methane Production And Its Simultaneous Storage, Su Xianbo, Huang Jin, Wang Qian, Yu Shiyao

Coal Geology & Exploration

Experimental study on CO2-enhanced coalbed methane production and its simultaneous storage Abstract: For a long time, a lot of work has been done on CO2-enhanced coalbed methane (CO2-ECBM), but the limited industrial trials failed to achieve the expected purpose, which prevented the promotion and application of CBM enhancement technology. In recent years, with the establishment of carbon neutrality routes in different countries, CO2 geological storage has gradually gained attention, and the questions of whether coal reservoirs can be treated as CO2 storage space and whether simultaneous CO2 displacing CH4 and …

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Practice And Cognition Of Efficient Cbm Development Under Complex Geological Conditions: A Case Study Of Zhengzhuang Block, Qinshui Basin, Zhu Qingzhong, Li Zhijun, Li Zongyuan, Wang Sanshuai, Sun Ruixue, Wang Yuting, Xiao Yuhang, Wang Jingyue, Guan Xiaoqu Mar 2023

Practice And Cognition Of Efficient Cbm Development Under Complex Geological Conditions: A Case Study Of Zhengzhuang Block, Qinshui Basin, Zhu Qingzhong, Li Zhijun, Li Zongyuan, Wang Sanshuai, Sun Ruixue, Wang Yuting, Xiao Yuhang, Wang Jingyue, Guan Xiaoqu

Coal Geology & Exploration

The geological conditions of various CBM sites in China are complicated and features similarly. With the recent development of exploring CBM towards the medium-deep, ultra-low permeability and structurally complex areas, it is of great significance to develop a set of efficient exploring techniques in complex areas to revitalize a large number of domestic CBM resources. Taking an example of the successful development of Zhengzhuang Block with early low yield and relatively complex geology, it had faced a series of problems, including complex geological conditions with internal fracture, strong heterogeneity, low permeability, lack of corresponding developing technologies for the early stage …

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Coal Methane Control And Its Emission Reduction Potential In China, Sang Shuxun, Liu Shiqi, Han Sijie, Zheng Sijian, Liu Tong, Zhou Xiaozhi, Wang Ran, Wang Meng Mar 2023

Coal Methane Control And Its Emission Reduction Potential In China, Sang Shuxun, Liu Shiqi, Han Sijie, Zheng Sijian, Liu Tong, Zhou Xiaozhi, Wang Ran, Wang Meng

Coal Geology & Exploration

Methane is the most important non-CO2 greenhouse gas, which has attracted more and more attention. Coal methane is the most important methane emission source in China, and China is also the country with the largest amount of coal methane emissions in the world. Therefore, the effective emission control and the efficient development and utilization of coal methane have triple benefits, such as greenhouse gas emission reduction, energy gas development and utilization, and hazardous gas control. Based on the accumulation of systematic investigation and research, the background of coal methane emission control was summarized and conclusion was made for the …

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Discussion On Underground System Sealing Methods In In-Situ Pyrolysis Exploitation Of Tar-Rich Coal, Guo Wei, Liu Zhao, Sun Youhong, Li Qiang, Deng Sunhua Mar 2023

Discussion On Underground System Sealing Methods In In-Situ Pyrolysis Exploitation Of Tar-Rich Coal, Guo Wei, Liu Zhao, Sun Youhong, Li Qiang, Deng Sunhua

Coal Geology & Exploration

China has abundant tar-rich coal resource, in-situ underground pyrolysis is the main trend of green and efficient development of tar-rich coal resources. However, the underground in-situ pyrolysis of tar-rich coal is still in the stage of technology research and development, and it is necessary to focus on the key technology of tar-rich coal to carry out research . Underground system sealing is one of the key technologies to ensure the efficient use of energy and ecological protection of tar-rich coal in-situ pyrolysis mining, and there is an urgent need to develop and construct underground system closure technology suitable for the …

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Tectonic Control On Enrichment And Metallogenesis Of Strategic Metal Elements In Coal Measures, Cao Daiyong, Wei Yingchun, Qin Guohong, Ning Shuzheng, Wang Anmin, Zhang Yun, Li Xin, Wei Jinhao, Xu Laixin Mar 2023

Tectonic Control On Enrichment And Metallogenesis Of Strategic Metal Elements In Coal Measures, Cao Daiyong, Wei Yingchun, Qin Guohong, Ning Shuzheng, Wang Anmin, Zhang Yun, Li Xin, Wei Jinhao, Xu Laixin

Coal Geology & Exploration

The accumulation and distribution of strategic metal minerals in coal measures is the comprehensive result of multi-factors, multi-stages and multi-levels, amongst which the tectonic control is an important factor. The tectonic controlling factors of strategic metal enrichment and mineralization in coal measures include tectonic background, tectonic movement, tectono-magmatic activity, etc., which are reflected in the control of the metal mineral carrier (i.e., coal-bearing rock series), the source of metallogenic materials and the initial aggregation of elements and the later migration and recombination. The entire process of formation and evolution of coal-bearing basins is pervasively influenced by the control of tectonic …

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The Mode Of “Five Modernization And Cooperation” In Coal Development Project, Fan Jingdao, Huang Kejun, Li Chuan, Liu Wei, Song Yue, Yan Zhenguo Mar 2023

The Mode Of “Five Modernization And Cooperation” In Coal Development Project, Fan Jingdao, Huang Kejun, Li Chuan, Liu Wei, Song Yue, Yan Zhenguo

Coal Geology & Exploration

Mining engineering plays a crucial role in providing energy and raw materials to human societies. With the integration of new information technology and traditional mining technology, traditional mining engineering management is struggling to keep up with the demands of efficient coal resource development and utilization. In response, this paper proposes a "Five Modernizations and Cooperation" project management method that combines traditional and modern technologies. The Five Modernizations include greenization, intellectualization, integration, professionalization, and refinement. This method emphasizes multi-objective, collaborative, open, servo, and self-organizing characteristics, with the ultimate goal of optimizing value. The full life cycle engineering framework system is built …

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Research And Practice On Key Technologies For Intelligentization Of Coal Mine, Wang Haijun, Cao Yun, Wang Honglei Mar 2023

Research And Practice On Key Technologies For Intelligentization Of Coal Mine, Wang Haijun, Cao Yun, Wang Honglei

Coal Geology & Exploration

Intelligentization of coal mine is an important way for coal industry to achieve sustainable development. It provides effective guarantee for coal mine enterprises to reduce workers, increase efficiency and improve the production safety. The new generation of information technologies, such as big data, robotics and artificial intelligence, strongly support the intelligent construction of coal mines. Firstly, the design ideas of intelligent mines are introduced in this paper, and the overall technical system of intelligent construction are developed. Secondly, the development status and trend of key technologies for the intelligentization of coal mine are analyzed, including the general heterogeneous control and …

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Construction Of Geological Guarantee System For Green Coal Mining, Wang Shuangming, Geng Jishi, Li Pengfei, Sun Qiang, Fan Zhangqun, Li Dan Mar 2023

Construction Of Geological Guarantee System For Green Coal Mining, Wang Shuangming, Geng Jishi, Li Pengfei, Sun Qiang, Fan Zhangqun, Li Dan

Coal Geology & Exploration

Large-scale and high-intensity mining of coal resources has induced damage to geological conditions and ecological environment in coal mining areas. It is of great significance to study the coupling mechanism of geological structure-groundwater environment-ecological environment dynamic evolution caused by coal mining. Development of the theory and technology of geological guarantee for green coal development is also critical for ensuring the high-quality development of coal industry in China. In additional to the current coal mining technology, research status of geological guarantee for green development of coal is analyzed in this paper Scientific connotation of “system of geological guarantee for green development …

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Research Progress And Thinking On Integrated Tunneling And Detection Technology Of Rock Roadway With Tbm, Yuan Liang, Zhang Pingsong Mar 2023

Research Progress And Thinking On Integrated Tunneling And Detection Technology Of Rock Roadway With Tbm, Yuan Liang, Zhang Pingsong

Coal Geology & Exploration

The construction of Full Face Tunnel Boring Machine (TBM) in coal mines is crucial for achieving efficient and modern high-intensity development and mining operations. However, TBM has poor adaptability to adverse geological conditions, such as fracture zones, faults, soft rock layers, and water-rich areas, which can cause problems such as collapses, equipment sticking, and water gushing, hindering their development. To fully utilize the rapid tunneling efficiency of TBM, integrated design between advanced detection instruments and TBM must be performed. The key technology is the breakthrough in detection-while-tunneling. This paper reviews recent advancements in the integrated tunneling and detection technology of …

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Status And Advance Of Seismic Diffraction Exploration In Coalfield, Peng Suping, Zhao Jingtao, Sheng Tongjie, Yang Jie, Tao Junhong Mar 2023

Status And Advance Of Seismic Diffraction Exploration In Coalfield, Peng Suping, Zhao Jingtao, Sheng Tongjie, Yang Jie, Tao Junhong

Coal Geology & Exploration

In China, there is an urgent need for intelligent and environmentally friendly coal mining practices to address the issue of accurately mapping transparent geological conditions, including coal rock structures, water-bearing bodies, goafs, and underground stress. These hidden disaster-causing bodies are prone to triggering mine accidents such as water inrush or gas outburst, which is the main obstacle to safe and intelligent coal mining. Three-dimensional seismic exploration is the main technology for detecting geological bodies such as faults and collapse columns. However, this technology, based on the framework of reflection theory, faces challenges in detecting small-drop faults and small-scale collapse columns. …

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Analysis And Jet Drilling Test Of Coiled Tubing Drilling String For Underground Coal Mine, Yao Ningping, Wang Li, Zhang Jinbao, Dou Xuqian, Wei Hongchao Mar 2023

Analysis And Jet Drilling Test Of Coiled Tubing Drilling String For Underground Coal Mine, Yao Ningping, Wang Li, Zhang Jinbao, Dou Xuqian, Wei Hongchao

Coal Geology & Exploration

Due to continuous tripping, uninterrupted circulation and other technical advantages, coiled tubing drilling has become one of the fastest developing oil-drilling-technologies in recent years. Developing the coiled tubing drilling technology for underground coal mine is an essential technical means to realize “less humanized” or even “unhumanized” coal drilling. Aiming at solving the key problems existing in the application of this technology in underground coal mine, such as pipe string optimization and drilling method, the coiled tubing jet directional drilling method was proposed. According to the mud pump capacity and borehole depth design for underground coal mine drilling, the fluid friction …

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Research On Low Illumination Video Enhancement Technology In Coal Mine Heading Face, Zhang Xuhui, Yang Hongqiang, Bai Linna, Shi Shuo, Du Yuyang, Zhang Chao, Wan Jicheng, Yang Wenjuan, Mao Qinghua, Dong Zheng Mar 2023

Research On Low Illumination Video Enhancement Technology In Coal Mine Heading Face, Zhang Xuhui, Yang Hongqiang, Bai Linna, Shi Shuo, Du Yuyang, Zhang Chao, Wan Jicheng, Yang Wenjuan, Mao Qinghua, Dong Zheng

Coal Geology & Exploration

Aiming at overcoming low illumination, uneven brightness, blurry texture and more noise in the video of coal mine heading face, a low illumination video enhancement algorithm was proposed for coal mine heading face. Firstly,the separability of convolution was utilized to carry out one-dimensional horizontal and vertical convolution of video images, then the perfect reflection method was used to achieve the automatic white balance, and the image hybrid enhancement technology was utilized to improve the overall brightness of the video images. Then, the image was divided into the highlight area, the middle tone area and the dark tone area by recursive …

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Review And Prospect Of Coal Mine Geological Guarantee System Inchina During 30 Years Of Construction, Jia Jiancheng, Jia Qian, Sang Xiangyang, Wu Yan Mar 2023

Review And Prospect Of Coal Mine Geological Guarantee System Inchina During 30 Years Of Construction, Jia Jiancheng, Jia Qian, Sang Xiangyang, Wu Yan

Coal Geology & Exploration

Geological guarantee is the indispensable basis for the safe, efficient and green mining of coal mine. The primary objective of this paper is to present a detailed review of the construction progress of China’s geological guarantee system over the past three decades, covering the key aspects of its intention, basic theoretical research, and technological and equipment development. The statement outlines five complex technical problems faced by the geological guarantee system in the context of green and intelligent mining, which include the low level of intelligence in geological information collection and interpretation, the need to improve advance prediction reliability based on …

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Theoretical And Technological Difficulties And Countermeasures Of Deep Cbm Exploration And Development In The Eastern Edge Of Ordos Basin, Xu Fengyin, Yan Xia, Li Shuguang, Xiong Xianyue, Wang Yuxin, Zhang Lei, Liu Chuanqing, Han Jinliang, Feng Yanqing, Zhen Huaibin, Yang Yun, Wang Chengwang, Li Yuxin Mar 2023

Theoretical And Technological Difficulties And Countermeasures Of Deep Cbm Exploration And Development In The Eastern Edge Of Ordos Basin, Xu Fengyin, Yan Xia, Li Shuguang, Xiong Xianyue, Wang Yuxin, Zhang Lei, Liu Chuanqing, Han Jinliang, Feng Yanqing, Zhen Huaibin, Yang Yun, Wang Chengwang, Li Yuxin

Coal Geology & Exploration

Deep coalbed methane (CBM) resources (hereinafter referred to the CBM resources with the buried depth greater than 2 000 m) are abundant in China and have great potential in exploration and development. Since 2019, Daning‒Jixian block in the eastern edge of Ordos Basin has entered the stage of "scaled exploration + pilot test" of deep CBM, with the daily gas production exceeding 2 × 104 m 3in vertical wells and 10 × 104 m 3in horizontal wells. This remarkable achievement has broken through the traditional depth limitation in CBM exploration and development. Thus,the total resource of …

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Table Of Contents, The Editors Mar 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Present Situation And Technical Research Progress Of Coalbed Methane Surface Development In Coal Mining Areas Of China, Zhang Qun, Jiang Wenping, Jiang Zaibing, Sun Siqing, Li Bingang, Du Xinfeng, Wu Xiuping, Zhao Jizhan, Fan Yao, Fan Zhangqun, Han Baoshan, Xu Yaobo, Liu Baigen Mar 2023

Present Situation And Technical Research Progress Of Coalbed Methane Surface Development In Coal Mining Areas Of China, Zhang Qun, Jiang Wenping, Jiang Zaibing, Sun Siqing, Li Bingang, Du Xinfeng, Wu Xiuping, Zhao Jizhan, Fan Yao, Fan Zhangqun, Han Baoshan, Xu Yaobo, Liu Baigen

Coal Geology & Exploration

The exploration and development process of coalbed methane (CBM) in coal mining areas, which was implemented under the organization and cooperation of the coal enterprises in China, was reviewed in this paper. After more than 30 years of hard work and unremitting efforts, gratifying achievements have been made in the research, engineering experiments and industrial development on CBM surface development technology, including the successful CBM development of anthracite coal in Jincheng mining area, Shanxi Province, for the first time at home and abroad, the largescale commercial production of CBM, the major breakthrough made in the CBM development technology by horizontal …

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Table Of Contents, The Editors Mar 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Ecological Environment Assessment Of Shanxi Province And Planned Mining Area Based On Coupling Remote Sensing Ecological Index (Rsei) Model, Ji Xianglin, Yan Yueguan, Guo Wei, Teng Yongjia, Zhao Chuanwu Mar 2023

Ecological Environment Assessment Of Shanxi Province And Planned Mining Area Based On Coupling Remote Sensing Ecological Index (Rsei) Model, Ji Xianglin, Yan Yueguan, Guo Wei, Teng Yongjia, Zhao Chuanwu

Coal Geology & Exploration

Ecological environment quality is an important indicator to evaluate the livability, and quantitative assessment on the change rule of regional ecological environment quality could provide scientific basis for the regional ecological environment protection and governance. Taking Shanxi Province and its planned mining area as the research area, the original Remote Sensing Ecology Index (RSEI) is added with Net Primary Productivity (NPP) and Habitat Quality (HQ) to characterize the carbon sink level and habitat suitability respectively based on Google Earth Engine (GEE) platform. Herein, three representative years from 2000 to 2018 were selected for analysis. Specifically, the temporal and spatial heterogeneity …

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Influencing Mechanism Of Rock Thermal Resistance On Convective Heat Transfer Of Fracture, Wang Yaning, Lu Chuan, Wang Guiling Mar 2023

Influencing Mechanism Of Rock Thermal Resistance On Convective Heat Transfer Of Fracture, Wang Yaning, Lu Chuan, Wang Guiling

Coal Geology & Exploration

The convective heat transfer characteristics between high temperature rocks and fluids in Enhanced Geothermal Systems (EGS) have been an important fundamental element of research on Hot Dry Rock (HDR). The thermal resistance of rock has an important influence on the convective heat transfer characteristics of fracture. In order to study its specific influence, two research methods, i.e., the theoretical analysis and the numerical simulation, were used in combination to study the heat transfer law between two parallel smooth flat plates by discussing the analytical solution and establishing the numerical model. The results show that the local Nusselt number Nux …

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Research On Control System Of Drill Pipe Conveying Device Based On Fuzzy Particle Swarm Optimization, Zhang Ning, Liu Qi, Shao Junjie, Chang Jianghua, Luo Pengping, Zou Zujie Mar 2023

Research On Control System Of Drill Pipe Conveying Device Based On Fuzzy Particle Swarm Optimization, Zhang Ning, Liu Qi, Shao Junjie, Chang Jianghua, Luo Pengping, Zou Zujie

Coal Geology & Exploration

In the tripping operation of large-diameter rescue well construction, the drill pipe conveying device used for large-diameter drilling tool transportation and drill string connection. In view of the problem that it is difficult to quickly and accurately lift the drill pipe to the angle of power head for make-up due to its easy vibration in the process of positioning, the structural characteristics and working principle of the drill pipe conveying device were analyzed at first. The kinematic model for the lifting of drill pipe was deduced with the structural relationship, obtaining the mapping relationship in the motion law of the …

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Numerical Simulation Of Co2 Storage In Bedded Salt Rock Storage Cavern In Subei Basin, Zong Shi, Liu Shiqi, Xu Hui, Wang Wenkai, Cao Bo, Huang Fansheng Mar 2023

Numerical Simulation Of Co2 Storage In Bedded Salt Rock Storage Cavern In Subei Basin, Zong Shi, Liu Shiqi, Xu Hui, Wang Wenkai, Cao Bo, Huang Fansheng

Coal Geology & Exploration

Underground salt cavern is an effective geological body for CO2 storage. The leakage of CO2 along the weak interlayer of salt rock and the interface of salt layer and interlayer is the key to restrict the safe storage of CO2 in underground salt cavern. A fluid-solid coupling mathematical model of CO2 storage in bedded salt cavern gas storage was established based on the CO2 salt cavern storage in Jintan area of Subei basin. On this basis, the leakage and migration law of CO2 in salt rock and mudstone interlayer, as well as its influence …

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Mechanism Of Coal Fine-Bubble Coupling In The Unsaturated Flow Stage Of Coalbed Methane Drainage, Han Wenlong, Li Yong, Chen Xiangsheng, Zhuo Qiming, Wang Yanbin Mar 2023

Mechanism Of Coal Fine-Bubble Coupling In The Unsaturated Flow Stage Of Coalbed Methane Drainage, Han Wenlong, Li Yong, Chen Xiangsheng, Zhuo Qiming, Wang Yanbin

Coal Geology & Exploration

To reveal the mechanism of interaction between coal fines and gas in the unsaturated flow stage of coalbed methane (CBM) drainage, it is essential to formulate the drainage system and improve the gas production. The effect of air bubbles with different diameters on coal fines with different particle sizes and densities was systematically experimented through the experiment device for microscopic interaction between the air bubble and the coal fines. Meanwhile, the influence of air bubbles on the migration trajectory and velocity of coal fines and the characteristics of coal fine capturing by air bubbles were also analyzed. The results show …

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Optimization Of Cemented Filling Material Ratio Based On Rsm-Bbd Method And Engineering Application, Wang Shushuai, Xu Bin, Li Yang, Yang Zhen Mar 2023

Optimization Of Cemented Filling Material Ratio Based On Rsm-Bbd Method And Engineering Application, Wang Shushuai, Xu Bin, Li Yang, Yang Zhen

Coal Geology & Exploration

In view of the problems of large stacking of solid waste caused by roof caving method in coal seam mining and imbalance between mining and filling in long-wall cemented backfilling, the No.31 ming area of Chahasu Coal Mine in Inner Monogolia uses continuous mining and filling roadway cemented backfilling mining technology, adopting the “mining at intervals of three” mining method and the “three with high strength filling and one with low strength filling” filling mode. The filling material ratio has an important influence on the filling cost and effect. In order to solve the problems of high cement consumption and …

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Mechanical Properties And Mechanism Of Co-Curing Saline Soil With Coal Solid Waste, Dong Chenxi, Wang Nianqin, Li Jiangshan, Chen Xin, Yan Xusheng, Ma Wei Mar 2023

Mechanical Properties And Mechanism Of Co-Curing Saline Soil With Coal Solid Waste, Dong Chenxi, Wang Nianqin, Li Jiangshan, Chen Xin, Yan Xusheng, Ma Wei

Coal Geology & Exploration

Under the research background of resource utilization of solid wastes in the arid and semiarid regions, a new curing material was developed with the coal wastes (such as the coal gangue (CG) and coal metakaolin (CMK)), the carbide slag (CS) that is a waste material readily available in the arid region, and the ordinary Portland cement (OPC). Besides, its mechanical properties and microscopic change mechanism in curing of saline soil in the arid and semi-arid regions were discussed. Based on the laboratory experiment, the unconfined compressive strength (UCS) characteristics of curing saline soil in different ages were studied by replacing …

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Wavefield Separation Of P- And S-Waves Based On Modified Pseudo-Helmholtz Decomposition Operator In Transverse Isotropic Media, Liu Zhaoshun, Du Qizhen, Lyu Wenhao, Zhou Shihao, Fu Liyun Mar 2023

Wavefield Separation Of P- And S-Waves Based On Modified Pseudo-Helmholtz Decomposition Operator In Transverse Isotropic Media, Liu Zhaoshun, Du Qizhen, Lyu Wenhao, Zhou Shihao, Fu Liyun

Coal Geology & Exploration

The separation of P- and S-wave fields is a significant step in elastic reverse-time migration (ERTM), which can effectively eliminate the waveform crosstalk and image artifacts, thus improving the precision of imaging. In anisotropic media, nonstationary spatial filters or low-rank approximation methods are commonly used to separate the wavefields. However, the application of multiple Fourier transforms results in the high computation costs of the above wavefield separation methods. Based on the idea of constructing the isotropic decoupling equations of P- and S- waves with the Helmholtz operator, a modified pseudo-Helmholtz decomposition operator was proposed to eliminate the amplitude distortion. Then, …

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Forward Modeling Of Radio-Magnetotelluric Method Based On Julia Acceleration And Study On Effect Of Displacement Current, Mei Zhuxu, Yuan Yuan, Zhou Feng, Zhou Cong, Zhang Lincheng Mar 2023

Forward Modeling Of Radio-Magnetotelluric Method Based On Julia Acceleration And Study On Effect Of Displacement Current, Mei Zhuxu, Yuan Yuan, Zhou Feng, Zhou Cong, Zhang Lincheng

Coal Geology & Exploration

Radio-magnetotelluric method (RMT) is one of the important tools for shallow surface electromagnetic exploration. Since the exploration frequency band is 10‒300 kHz, the propagation of electromagnetic fields is greatly affected by the dielectric permittivity of the earth. The electromagnetic response calculated with traditional quasi-static conditions severely restricts the accuracy of RMT forward modeling and further affects the resolution of the inversion imaging. In response to this problem, a numerical simulation method of full-current RMT electromagnetic response based on Julia parallel acceleration was proposed. Then, the calculation of each frequency point was sent through the distributed computing in Julia to different …

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