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- Keyword
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- Numerical simulation (87)
- Coalbed methane (47)
- Coal mine (39)
- Ordos Basin (31)
- Gas drainage (28)
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- Deep learning (27)
- Permeability (27)
- Pore structure (27)
- Coalbed methane (CBM) (25)
- Deep coalbed methane (24)
- Hydraulic fracturing (23)
- Tar-rich coal (23)
- Directional drilling (21)
- Underground coal mine (20)
- Coal (17)
- Deep coalbed methane (CBM) (17)
- Qinshui Basin (15)
- Horizontal well (14)
- Open-pit coal mine (14)
- Rock burst (14)
- Shale gas (13)
- Underground coal gasification (UCG) (13)
- Fracture (12)
- Machine learning (12)
- Mine water (12)
- Prospect (12)
- Fractal dimension (11)
- Helium (11)
- Intelligent mining (11)
- Microstructure (11)
- Publication Year
Articles 1141 - 1170 of 1799
Full-Text Articles in Sustainability
Research Progress Of Multi-Source And Multi-Stage Genesis Of Co2-Enriched Cbm And The Enlightenments For Its Exploration And Development, Tang Shuling, Tang Dazhen, Sun Bin, Tao Shu, Zhang Taiyuan, Pu Yifan, Zhang Aobo, Zhi Yuanhao
Research Progress Of Multi-Source And Multi-Stage Genesis Of Co2-Enriched Cbm And The Enlightenments For Its Exploration And Development, Tang Shuling, Tang Dazhen, Sun Bin, Tao Shu, Zhang Taiyuan, Pu Yifan, Zhang Aobo, Zhi Yuanhao
Coal Geology & Exploration
CO2-enriched coalbed methane(CBM) carries important geological information on CBM genesis and accumulation, and is closely related to the exploration and evaluation of CBM resources. On the basis of the systematic summary of the current research progress of CBM genesis, the current research status of the genetic mechanism of CO2-enriched CBM reservoirs was scientifically analyzed by dissecting the special geological examples of CO2-enriched CBM reservoirs in the southern Junggar Basin, and the problems in the research process of CBM genesis were comprehensively pointed out. The study shows that the generation of CBM has multiple sources …
Theoretical Basis Of Dredging And Efficient Development Of High−Rank Coalbed Methane In China: A Case Study Of The Qinshui Basin, Zhu Qingzhong
Theoretical Basis Of Dredging And Efficient Development Of High−Rank Coalbed Methane In China: A Case Study Of The Qinshui Basin, Zhu Qingzhong
Coal Geology & Exploration
China is rich in high-rank coalbed methane(CBM) resources, which accounts for more than 90% of the total production of CBM in China. The efficient development and utilization of high-rank coal and coalbed methane(CBM) resources is of great practical significance for ensuring national energy strategic security and helping to achieve the strategic goals of “carbon peak and carbon neutrality”. The coalbed methane industry in China is generally characterized by low exploration and development degree, poor adaptability of main technology, low rate of return on investment and small development scale. The large-scale and efficient development of coalbed methane is faced with great …
Influence Of Coal Lithotypes On Adsorption/Desorption Characteristics In Coal Reservoirs And Its Practical Significance: A Case Study In Baode Block, Hou Wei, Xu Fengyin, Zhang Lei, Zhang Wei, Meng Yanjun, Liu Qihu, Li Yongchen, Fan Hongbo, Wang Hongya, Zhang Shuangyuan, Zhang Wen
Influence Of Coal Lithotypes On Adsorption/Desorption Characteristics In Coal Reservoirs And Its Practical Significance: A Case Study In Baode Block, Hou Wei, Xu Fengyin, Zhang Lei, Zhang Wei, Meng Yanjun, Liu Qihu, Li Yongchen, Fan Hongbo, Wang Hongya, Zhang Shuangyuan, Zhang Wen
Coal Geology & Exploration
The difference of coal lithotypes is an important factor affecting the adsorption/desorption characteristics of coalbed methane (CBM) and the productivity of CBM wells. According to four coal samples of different lithotypes from No. 8+9 Coal Seam in Well BX-2, proximate analysis, maceral, wettability and isothermal adsorption/desorption experiments are carried out, and the influence of coal lithotypes on CBM adsorption/desorption characteristics and its mechanism is discussed. The results show that vitrinite content in dull, semi-dark, semi-bright and bright coal samples increases gradually, water and ash content decreases gradually, hydrophilicity decreases gradually, and the Langmuir volume increases gradually. Bright and semi-bright coal …
Characteristics Of Coal Reservoirs And Favorable Areas Classification And Optimization Of Cbm Planning Blocks In Guizhou Province, Xiang Wenxin, Sang Shuxun, Wu Zhangli, Tu Bin, Guo Zhijun, Han Sijie, Zhou Xiaozhi, Zhou Peiming
Characteristics Of Coal Reservoirs And Favorable Areas Classification And Optimization Of Cbm Planning Blocks In Guizhou Province, Xiang Wenxin, Sang Shuxun, Wu Zhangli, Tu Bin, Guo Zhijun, Han Sijie, Zhou Xiaozhi, Zhou Peiming
Coal Geology & Exploration
The scientific evaluation of favorable CBM blocks concerns the deployment of CBM exploration and development and the maximization of benefits. On the basis of the existing geological and engineering data, the geological background, resource characteristics, occurrence characteristics and reservoir characteristics of CBM are studied in the 18 blocks with unregistered mining rights in Guizhou Province. According to the principle of coal rank classification and evaluation, the optimum block among the 18 blocks is selected by using the multi-level fuzzy comprehensive evaluation method. The results are as follows. (1) The coal seams of Longtan Formation in the 18 planning blocks of …
Multi-Scale Prediction Of Coal Seam Fracture Development In Mg Block, Eastern Margin Of Ordos Basin, Zhu Guanghui, Li Zhongcheng, Shi Suzhen, Shi Hao, Lin Liming, Liu Yancheng, Zhang Xin
Multi-Scale Prediction Of Coal Seam Fracture Development In Mg Block, Eastern Margin Of Ordos Basin, Zhu Guanghui, Li Zhongcheng, Shi Suzhen, Shi Hao, Lin Liming, Liu Yancheng, Zhang Xin
Coal Geology & Exploration
Finding out the development characteristics of coal seam fractures is of great significance for coalbed methane exploitation and safe production of underground coal mines. Logging and seismic are effective means of geophysical identification of coal seam fractures. Electrical imaging, resistivity, density, sonic differential time, natural gamma, neutron porosity and array acoustic logs are used to describe the small scale fracture morphology of No.8 and No.9 coal seams of MG block in the eastern margin of Ordos Basin. The middle-scale fracture of No.8 and No.9 coal seams was predicted by prestack Azimuth AVO inversion in OVT domain. And the large-scale fracture …
Water Inrush Warning System Of Deep Limestone In Panxie Mining Area Based On Multi-Source Data Mining, Bi Bo, Chen Yongchun, Xie Hao, An Shikai, Xu Yanfei
Water Inrush Warning System Of Deep Limestone In Panxie Mining Area Based On Multi-Source Data Mining, Bi Bo, Chen Yongchun, Xie Hao, An Shikai, Xu Yanfei
Coal Geology & Exploration
Under the long-term water-rock interaction, the hydrochemical composition of deep limestone water in each aquifer is different. Such factors as crustal movement and mining influence have led to the hydraulic connection between aquifers. Major water inrush accidents often occur when the deep high-pressure limestone water bursts into the mine with the shallow limestone water as a channel. On the basis of water level data of 182 surface hydrological observation holes in nine coal mines in Panxie Mining Area of Huainan Coalfield from 2015 to 2018, and the temporal and spatial law of water level change of each hydrological observation hole …
Characteristics Of Roof Water Inflow And Control Technology For High Intensity Mining In Dongsheng Mining Area，Shenfu Coalfield, Xu Feng, Jin Dewu, Yang Maolin, Wang Shidong, Huang Huan, Dang Yakun
Characteristics Of Roof Water Inflow And Control Technology For High Intensity Mining In Dongsheng Mining Area，Shenfu Coalfield, Xu Feng, Jin Dewu, Yang Maolin, Wang Shidong, Huang Huan, Dang Yakun
Coal Geology & Exploration
In view of the threat of roof water disasters in coal mining in western China, the water inflow data of 50 working faces are counted in Dongsheng Mining Area of Shenfu Coalfield, and five typical water inflow characteristics are summarized, which are dynamic recharge-led sustained growth type, the increasing first and then stabilizing type with “dynamic-static” reserves acting together, continuous stability of micro inflow, differential hydrogeological conditions locally prominent type, and the increasing first and then decreasing type dominated by static reserves. According to the law of each type of water inrush, the corresponding ideas and measures of water disaster …
Comprehensive Correlation Technology Of Coal And Rock Layers In Mines For Intelligent Mining, Wang Haijun, Liu Shande, Ma Liang, Zhu Yuying, Shu Jiansheng, Wang Xiangye
Comprehensive Correlation Technology Of Coal And Rock Layers In Mines For Intelligent Mining, Wang Haijun, Liu Shande, Ma Liang, Zhu Yuying, Shu Jiansheng, Wang Xiangye
Coal Geology & Exploration
The coal-rock correlation runs through the whole process of the coal geological exploration and the mine production stage. In view of the difficult problems of the coal-rock correlation in the mine production stage, such as short distance, multi-coal seams and complex structure, taking Huoshaopu Coal Mine in Panxian Coalfield of Guizhou Province as the research object, through the analysis of the geological exploration data, combined with the surface gas investigation boreholes, the underground geological survey, the gas parameter test, the marker layer suitable for the mine production stage was extracted from the coal-rock correlation marker layers established during the geological …
Application Of Advanced Regional Treatment Technology Of Hard Roof In Buertai Coal Mine Of Shendong Coal Group, Yang Junzhe, Wang Zhenrong, Lyu Qingxu, Yang Sen, Li Guo, Zheng Kaige
Application Of Advanced Regional Treatment Technology Of Hard Roof In Buertai Coal Mine Of Shendong Coal Group, Yang Junzhe, Wang Zhenrong, Lyu Qingxu, Yang Sen, Li Guo, Zheng Kaige
Coal Geology & Exploration
The hard roof is a difficult problem in rock stratum control. The breaking and instability of high hard rock strata often induces strong coal pressure disasters, seriously threatening the safety production in coal mines. Hard roof control is one of the major problems in coal mine safety production. In response to the problems of large thickness, high hardness of the coal seam roof and its difficulty in collapse in Buertai Coal Mine in Shendong Mining Area, the hydraulic fracturing mechanism and technical advantages of directional long borehole segmented hydraulic fracturing are analyzed. The location of boreholes is determined based on …
Evaluation Of Coalbed Methane Extraction Effect Based On 3d Geological Modeling Technology: An Example Of Sihe Mine In Jincheng City, Jiang Zaibing, Yang Jianchao, Li Yong, Pang Tao
Evaluation Of Coalbed Methane Extraction Effect Based On 3d Geological Modeling Technology: An Example Of Sihe Mine In Jincheng City, Jiang Zaibing, Yang Jianchao, Li Yong, Pang Tao
Coal Geology & Exploration
Three-dimensional geological modeling can intuitively and visually evaluate the effect of coalbed methane(CBM) dynamic drainage, and provide guidance for subsequent adjustments to development plans. With the help of 3D geological modeling software, No.3 Coal Seam of west-second panel is taken as the research object. A geological model that can reflect the spatial geometric changes and structural characteristics of coal seams, and the dynamic changes of coal reservoir attribute parameters is established based on the analysis of geological and productivity data and numerical simulation, to realize the dynamic evaluation of the CBM extraction effect in the study area. The constructed three-dimensional …
Table Of Contents, The Editors
Geochemical Characteristics And Significance Of Water Produced By Coalbed Methane Wells In Lu’An Mining Area, Hua Mingguo, Tian Lin, Zhang Yan, Li Jia, Cao Yongheng
Geochemical Characteristics And Significance Of Water Produced By Coalbed Methane Wells In Lu’An Mining Area, Hua Mingguo, Tian Lin, Zhang Yan, Li Jia, Cao Yongheng
Coal Geology & Exploration
Hydro-geochemistry analysis is an important method for CBM exploration and development research. In this paper, the distribution characteristics of salinity, H/O stable isotope and ion concentration in sample water was investigated, and the optimal CBM development area was analyzed by the characteristics of regional structural distribution and the CBM development history. The testing water was from the No.3 CBM well of the Shanxi Formation Permian system in the Lu’an Mining area in the south-central part of Qinshui Basin. The results show that there are three high salinity areas in the mining area, with an average groundwater salinity of 2 000-3200 …
Mechanical Properties And Acoustic Emission Characteristics Of Sandstone Under Natural And Saturated Conditions, Zhang Yin, Li Zhe, Song Shikang, Zhao Yi, Li Hao
Mechanical Properties And Acoustic Emission Characteristics Of Sandstone Under Natural And Saturated Conditions, Zhang Yin, Li Zhe, Song Shikang, Zhao Yi, Li Hao
Coal Geology & Exploration
In order to study the mechanical properties and acoustic emission (AE) characteristics of sandstone with different grain sizes in the process of damage and failure under saturated and natural conditions, we carried out uniaxial compression tests and AE tests on three kinds of sandstone under saturated and natural conditions to study the mechanical properties and AE characteristics under the uniaxial stress state. The test results show that the average compressive strength of coarse-grained sandstone, medium-grained sandstone, and fine-grained sandstone are 54.23 MPa, 53.56 MPa, 59.46 MPa respectively under natural conditions, and 35.62 MPa, 31.79 MPa and 29.10 MPa under saturated …
The Reflected Radio Wave Method For Detecting Coal Seam Faults In Mining Face, Gu Huanqi, Wu Rongxin, Shen Guoqing, Hu Ze
The Reflected Radio Wave Method For Detecting Coal Seam Faults In Mining Face, Gu Huanqi, Wu Rongxin, Shen Guoqing, Hu Ze
Coal Geology & Exploration
Mine radio wave exploration can be used for coal seam geological structure exploration. With its advantages of portability and good effect, it has become a conventional and necessary means for coal seam geological structure exploration. At present, the energy attenuation of radio wave signal in coal seam is fast, and the transmission radio wave detection of working face is restricted in large width coal seam. On this basis, the radio wave reflection exploration method of coal seam working face is proposed. Firstly, the electric model of two-dimensional coal measure strata is constructed by numerical simulation to analyze the field strength …
Down-Hole Ø550 Mm Super Large Diameter Coal Seam Borehole Drilling Technology And Equipment And Its Engineering Application, Sun Yongxin
Coal Geology & Exploration
For the prpose of improving the gas control efficiency and reduce the cost in the goaf of “U” ventilation face, the ø550 mm super-large diameter borehole was used to replace the cross-heading buried pipe for gas drainage in goaf. According to the characteristics of super-large diameter borehole and the technical problems existed in construction, a ZDY15000LP super-large diameter spiral drilling rig with maximum torque 15000 N·m, maximum penetration 700 kN, and maximum stroke 1.3 m has been developed, which adopted the two-body layout of main engine and pump station, and the innovative design of key parts such as main engine, …
Acoustic Emission Characteristics And Fracture Response Behavior Of Hard Rock-Like Material Under Influence Of Loading Rate, Zhang Zekun, Song Zhanping, Cheng Yun, Huo Runke, Song Wanxue, Wang Kuisheng, Wang Tong, Yang Tengtian, Liu Wei
Acoustic Emission Characteristics And Fracture Response Behavior Of Hard Rock-Like Material Under Influence Of Loading Rate, Zhang Zekun, Song Zhanping, Cheng Yun, Huo Runke, Song Wanxue, Wang Kuisheng, Wang Tong, Yang Tengtian, Liu Wei
Coal Geology & Exploration
For the purpose of clarifying the correlation between Acoustic Emission(AE) and rupture response characteristics and loading rate in the failure and instability of hard rocks, uniaxial compression tests and acoustic emission tests were conducted on hard rock-like material samples at different loading rates to analyze the characteristics of mechanical parameters, AE phenomena and rupture response characteristics of hard rock-like material, and to obtain the early warning information of the rock failure based on the information on AE parameters. The results show that the peak strength, elastic modulus and peak strain of hard rock-like material have the loading rate effect. The …
Effects Of The Agglomerated Fracturing Fluid On The Transportation Of Pulverized Coal And Its Mechanism, Song Jinxing, Shi Junke, Liu Jianzhuang
Effects Of The Agglomerated Fracturing Fluid On The Transportation Of Pulverized Coal And Its Mechanism, Song Jinxing, Shi Junke, Liu Jianzhuang
Coal Geology & Exploration
During the drainage process, the pulverized coal moves with the carrier fluid in supporting fractures, resulting in the blockage of the fractures and then a decrease in the permeability of the coal reservoir and the conductivity of the supporting fractures. For the purpose of exploring the effects of the properties of the agglomerated fracturing fluid on the transportation of pulverized coal and its mechanism, the coal samples from Urumqi Hedong Mining Area in southern Junggar Basin coalfield are selected as the research object, with distilled water, active water fracturing fluid(1.5%KCl), and agglomeration fracturing fluid(1.5%KCl+0.05%AN) as the carrier fluids. Through the …
Potential Of Oil-Rich Coal Resources In Shaanxi Province And Its New Development Suggestion, Ma Li, Wang Shuangming, Duan Zhonghui, Yang Fu, Fu Deliang, He Dan, Zhang Liwei
Potential Of Oil-Rich Coal Resources In Shaanxi Province And Its New Development Suggestion, Ma Li, Wang Shuangming, Duan Zhonghui, Yang Fu, Fu Deliang, He Dan, Zhang Liwei
Coal Geology & Exploration
Under the requirement of carbon peak and carbon neutral targets, the low carbon development and utilization of coal resources in Shaanxi Province is imperative. The law of tar yield from high to low in each coalfield of Shaanxi Province was revealed based on more than 5 000 sets of coal quality data: northern Shaanxi Triassic Coalfield, northern Shaanxi Jurassic Coalfield, Shanbei carboniferous Permian Coalfield, Huanglong Jurassic Coalfield, Weibei carboniferous Permian Coalfield. And three types of oil-rich coal were classified: oil-rich coal type, oil-rich coal-high oil-coal type, oil-rich coal-oil-coal type. According to the calculation method of coal resources, Shaanxi Province has …
Research On The Graphitization Potential Of Coal In Sichuan And Chongqing, Li Jing, Wang Lu, Liu Yongwang, Luan Jinhua, Zhang Ruigang, Zhang Sen, Wang Anmin
Research On The Graphitization Potential Of Coal In Sichuan And Chongqing, Li Jing, Wang Lu, Liu Yongwang, Luan Jinhua, Zhang Ruigang, Zhang Sen, Wang Anmin
Coal Geology & Exploration
The graphitization of coal is beneficial to enhancing the strategic guarantee ability of graphite resources and promoting the efficient utilization of coal measures mineral resources and transformation and upgrading of coal enterprises. The development potential of coal-based graphite resources in Sichuan and Chongqing is evaluated in the critical period of energy and mineral reform and transformation. On the basis of the analysis of coal graphitization, the precursors for coal-based carbon materials and coalfield geology, the major coal types, coal quality and characteristics of macerals, Principal Component Analysis(PCA) is applied to explore the development potential of coal-based graphite in Sichuan and …
Present Situation And Prospects Of Coal-Derived Gas Exploration And Development In Shanxi Province, Gong Jieli, Li Guofu, Li Dehui, Liu Liangliang, Wang Zheng, Xu Yun, Wang Xuchao
Present Situation And Prospects Of Coal-Derived Gas Exploration And Development In Shanxi Province, Gong Jieli, Li Guofu, Li Dehui, Liu Liangliang, Wang Zheng, Xu Yun, Wang Xuchao
Coal Geology & Exploration
Coal-derived gas includes coalbed methane(CBM), shale gas and tight sandstone gas. CBM development is of practical significance to ensure coal mine safety, increase clean energy supply, improve regional energy consumption structure, and promote the clear water and blue sky program, which is more in line with the national strategic requirements of developing green energy, achieving carbon neutrality and peaking carbon dioxide emissions. Shale gas and tight sandstone gas are of great significance to improve China’s energy structure and achieve the goal of carbon neutrality and peaking carbon dioxide emissions. Based on the comprehensive analysis of the beneficial exploration and successful …
Risk Assessment Of Water Inrush From Coal Seam Floors Based On Multiple Methods, Ren Junhao, Wang Xinyi, Wang Qi, Wang Junzhi, Zhang Bo, Guo Shuitao
Risk Assessment Of Water Inrush From Coal Seam Floors Based On Multiple Methods, Ren Junhao, Wang Xinyi, Wang Qi, Wang Junzhi, Zhang Bo, Guo Shuitao
Coal Geology & Exploration
Five factors including the thickness of the aquifer, the complexity of the fault, the water pressure of the aquifer, the unit water inflow of the aquifer, and mining height of 51 boreholes in No.2, No.10 and No.12 Coal Mines of Pingdingshan Coalfield are selected as the index factors. On the basis of the constant weight calculated by the analytic hierarchy process and grey relational analysis, the variable weights of each index factor are determined by applying the variable weight theory. By using the matter-element extension method, fuzzy variable set theory, catastrophe theory, and fuzzy comprehensive evaluation method, the water inrush …
Quantification And Mechanism Analysis Of Meso-Damage Of High-Temperature Granite Under Different Cooling Modes, Zhang Sen, Shu Biao, Liang Ming, Lu Wei, Hu Yongpeng, Xue Hui
Quantification And Mechanism Analysis Of Meso-Damage Of High-Temperature Granite Under Different Cooling Modes, Zhang Sen, Shu Biao, Liang Ming, Lu Wei, Hu Yongpeng, Xue Hui
Coal Geology & Exploration
Cooling shock is an effective method to increase the permeability of geothermal reservoir by causing fractures on high temperature rock. For the purpose of quantitatively analyze the damage degree of granite caused by cooling shock at different heating temperatures and explore the damage mechanism under the action of cooling shock, the damage of high temperature granite samples under was analyzed under natural cooling and water cooling conditions by means of thin section observation and SEM scanning technology. The results show that when the heating temperature is increased from 200°C to 800°C, the crack density of the section A at the …
Prediction Of Burnt Rock Areas And Water Abundance Based On The Electrical-Magnetic Method, Yan Shunshang, Wang Ling, Dong Fangying, Liu Xiao, Lyu Xiaolei
Prediction Of Burnt Rock Areas And Water Abundance Based On The Electrical-Magnetic Method, Yan Shunshang, Wang Ling, Dong Fangying, Liu Xiao, Lyu Xiaolei
Coal Geology & Exploration
For the purpose of accurately ascertaining the distribution range and water abundance degree of the burnt rock mass in the mining area, a new set of methods for prediction and exploration of burnt area boundaries and water-richness is presented based on overall consideration of the electrical-magnetic characteristics of the geological body. Three geophysical prospecting methods including high-precision magnetic survey, transient electromagnetic method and high-density electrical method are used for joint exploration are applied to the exploration of the burnt area of Shajihai No.1 Minefield in Xinjiang. The results show that the southern boundary of the burned area moves slightly compared …
Detection Performance Of The Azimuthal Electromagnetic Wave Logging Instrument At Coal-Rock Interface In Horizontal Wells, Zhang Yi, Kang Zhengming, Feng Hong, Han Xue, Li Fei, Li Xin
Detection Performance Of The Azimuthal Electromagnetic Wave Logging Instrument At Coal-Rock Interface In Horizontal Wells, Zhang Yi, Kang Zhengming, Feng Hong, Han Xue, Li Fei, Li Xin
Coal Geology & Exploration
The advance and accurate identification of coal-rock interfaces is one of the key technologies to realize intelligent mining, improve mining efficiency and reduce cost. Azimuthal electromagnetic wave logging has achieved good results in lithologic interface identification of petroleum logging, but the identification of coal-rock interface is seldom studied. For the purpose of studying the applicability and detection performance of azimuthal electromagnetic wave in the coalfield logging environment, the one-dimensional generalized reflection coefficient method is used to calculate the magnetic field component, and the fast Hankel transform is used to accelerate the integral calculation speed. What is more, the effects of …
Development Of A Methane Concentration Monitoring Sensor In Underground Boreholes Of Coal Mines, Cong Lin
Development Of A Methane Concentration Monitoring Sensor In Underground Boreholes Of Coal Mines, Cong Lin
Coal Geology & Exploration
At present, during underground drilling operations in coal mines, the methane concentration monitoring system can only reflect the total drainage volume of methane at the borehole, and cannot observe the effect of methane drainage of a certain section of the borehole. With the increase of the borehole depth for underground methane drainage, the effect of methane drainage changes greatly along the length of the borehole. There is a big difference in the effective extraction radius at different hole depths, leading to greater difficulty in arranging the boreholes for methane extraction, and increased uncertainty. In response to this problem, a methane …
Development And Test Analysis Of Borehole In-Situ Rock Mass Shear Measurement System, Zhang Youzhen, Liu Yanjie, Zhong Zicheng
Development And Test Analysis Of Borehole In-Situ Rock Mass Shear Measurement System, Zhang Youzhen, Liu Yanjie, Zhong Zicheng
Coal Geology & Exploration
The pre-drilled rock shear measurement system can measure the internal friction angle and cohesion of in-situ rock in mines. Compared with the traditional laboratory test and field tests, such method can keep the essential state of rock mass to the maximum extent, and obtain the test data conveniently and quickly. Firstly, the overall design idea of the system was elaborated, and the pre-drilled in-situ rock shear equipment was successfully developed and the data acquisition and storage software platform was built. Secondly, the test data processing method was developed, based on the working principle of the shearing instrument, and the specific …
Effects Of Different Tempering Temperatures On The Microstructure And Mechanical Properties Of A Low-Carbon High-Strength Steel, Lu Tian, Wen Guodong, Ma Xiaolin, Li Jun, Ju Pei, Wang Shiqing
Effects Of Different Tempering Temperatures On The Microstructure And Mechanical Properties Of A Low-Carbon High-Strength Steel, Lu Tian, Wen Guodong, Ma Xiaolin, Li Jun, Ju Pei, Wang Shiqing
Coal Geology & Exploration
The mechanical properties of low carbon high strength steel materials used in drilling equipment can be improved effectively by adjusting tempering temperatures of different heat treatments to obtain different material composition. The heat treatment and tempering temperatures were set at 610℃, 630℃ and 650 ℃ respectively, and the microstructure of this low-carbon high-strength steel was compared and analyzed by metallographic microscope and Scanning Electron Microscope(SEM). After tempering, the microhardness, tensile properties and impact energy of the structure were measured respectively by the microhardness tester, universal material testing machine and impact testing machine. The research results show that the performance of …
Table Of Contents, The Editors
Characteristics And Detection Performance Of The Source Of Seismic While Excavating In Underground Coal Mines, Wang Baoli, Cheng Jianyuan, Jin Dan, Yang Xiaogang, Yang Hui
Characteristics And Detection Performance Of The Source Of Seismic While Excavating In Underground Coal Mines, Wang Baoli, Cheng Jianyuan, Jin Dan, Yang Xiaogang, Yang Hui
Coal Geology & Exploration
Against a background of intelligent coal mines, seismic while excavating has become one of the key geological guarantee technologies for safe excavation in the mining face. It can detect hidden geological structures in real-time, in advance and finely, such as goafs, faults, and collapsed columns, effectively promoting safe and efficient excavation and production. Different from the widely used advanced detection technology of reflection in-seam wave, the vibration signal of the tunneling machine is used as the excitation source, which replaces the explosive source in conventional seismic exploration. It has the advantages of environmental frendliness, safety, low cost, recyclability and combined …
Application Of Borehole Transient Electromagnetic Method In Detecting The Cross-Border Mining Goaf, Fan Tao, Li Ping, Zhao Zhao, Li Wei, Zhao Rui, Zhang Peng, Yao Weihua, Li Yuteng, Fang Zhe
Application Of Borehole Transient Electromagnetic Method In Detecting The Cross-Border Mining Goaf, Fan Tao, Li Ping, Zhao Zhao, Li Wei, Zhao Rui, Zhang Peng, Yao Weihua, Li Yuteng, Fang Zhe
Coal Geology & Exploration
Cross-border mining in underground coal mines disrupts the order of coal resource development, and has huge hidden safety danger. Accurate detection of goafs caused by cross-border mining and their boundaries is extremely important for safe mining. Conventional mine transient electromagnetic detection methods are susceptible to interference from metal and electromagnetic signals in the roadway, and its detection accuracy is limited, which makes it difficult to meet the needs of accurate interpretation of goaf boundary. For the purpose of solving this problem, a drilling transient electromagnetic method and construction technology for transmitting and receiving signals in drilling is proposed to increase …