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- Keyword
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- Coalbed methane (10)
- Numerical simulation (10)
- Coal-based graphite (6)
- Open-pit coal mine (6)
- Fracture (5)
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- Qinshui basin (5)
- Baode coal mine (4)
- CBM (4)
- Drilling fluid (4)
- High concentration slurry (4)
- Hydrogeochemistry (4)
- Prospect (4)
- Water cutoff curtain (4)
- Binchang mining area (3)
- Directional drilling (3)
- Fault (3)
- Fractal theory (3)
- Fracturing (3)
- Gas drainage (3)
- Geochemistry (3)
- Geothermal energy (3)
- Goaf (3)
- Main controlling factors (3)
- Microseismic events (3)
- Microstructure (3)
- Mudstone (3)
- Ordos basin (3)
- Shale (3)
- Surrounding well test (3)
- Thermal conductivity (3)
Articles 31 - 60 of 204
Full-Text Articles in Engineering
Hair Clip Type Core Lifter For Improving Coring Quality In Complex Formation And Its Ap-Plication, Liao Yuansu, Hu Qifeng, Miao Sai, Chen Haoxi, Zhuo Lianming
Hair Clip Type Core Lifter For Improving Coring Quality In Complex Formation And Its Ap-Plication, Liao Yuansu, Hu Qifeng, Miao Sai, Chen Haoxi, Zhuo Lianming
Coal Geology & Exploration
Based on the urgent need of accurate exploration of geological anomalous bodies such as collapse columns and small faults in underground coal mines for near-horizontal boreholes coring drilling of leakage formation, the double-wall hydraulic reverse circulation continuous coring technology was proposed, its technical principle and characteristics were analyzed, the matching ø89/42 mm double-wall coring drilling pipes and reverse circulation coring bits were developed. Three near-horizontal coring boreholes were drilled, the functional tests were carried out in a surface mine, the maximum core recovery rate of a single borehole was 83.6%, the maximum roundtrip footage was 69 m and the average …
Late Pleistocene Sedimentary Features And The Palaeoclimatic Background In Hongsibao Basin, Li Zhenhong, Cui Jiawei, Li Chaozhu, Jiang Boyu, Huang Ting
Late Pleistocene Sedimentary Features And The Palaeoclimatic Background In Hongsibao Basin, Li Zhenhong, Cui Jiawei, Li Chaozhu, Jiang Boyu, Huang Ting
Coal Geology & Exploration
The chuck is an important part of the coal mine tunnel drilling rig. The performance of the chuck directly affects the efficiency and quality of drilling. Aiming at the problems of the rubber cylinder hydraulic chuck. a new radial piston hydraulic chuck is studied. The objective of this paper is to devise a new radial piston hydraulic chuck instead of rubber-sleeve hydraulic chuck. Then, the motion mathematical model of radial piston hydraulic chuck was established based on the radial piston chuck clamping and loosening of system structure and working principle. At the same time, a dynamic co-simulation of chuck hydraulic …
Application Of Pre-Stack Denoising Technique In Full Digital High Density 3d Seismic Technique In Coal Mining Districts, Yu Jie
Coal Geology & Exploration
Coalbed methane resource conditions and reservoir physical conditions are the basis of CBM exploration and exploitation. The geological modeling of CBM reservoir was carried out to clarify the spatial distribution of coal reservoir, and explain the difference of single well productivity, which can provide theoretical basis for selection and well drilling. This paper took Baode unit I as research object. Based on the measured data of gas content and well test permeability, the inversion model of gas content and permeability in the study area was established by using support vector machine algorithm(SVM) and transformed F-S permeability calculation formula, and the …
Analysis On The Cbm Extraction Effect Of The Horizontal Wells In The Coal Seam Roof In Luling Coal Mine In Huaibei, Fang Liangcai, Li Guihong, Li Dandan, Li Haozhe, Liu Jia
Analysis On The Cbm Extraction Effect Of The Horizontal Wells In The Coal Seam Roof In Luling Coal Mine In Huaibei, Fang Liangcai, Li Guihong, Li Dandan, Li Haozhe, Liu Jia
Coal Geology & Exploration
Aiming at the scientific evaluation of coaxial casing heat transfer of geothermal resources with medium burial depth(1 500-4 000 m), a rock-water coupled heat transfer model of a vertical single well was built based on the simulation platform of COMSOL Multiphysics software. Taking the stratigraphic and geothermal characteristics of Xi'an area as the simulation background, the heat transfer capacity of single well(3 500 m)casing under two different geothermal gradients(0.027℃/m and 0.030℃/m) and four flow velocities(0.25, 0.50, 0.75, 1.00 m/s) was calculated and analyzed. Meanwhile, the numerical models of group wells with five kinds of well spacing were established, and the …
Development Characteristics Of Water-Conducting Fractured Zone In Deep Coal Seam Based On Microseismic Monitoring, Hou Enke, Fan Jichao, Xie Xiaoshen, Long Tianwen, Zhang Huanlan, Wang Jianhui, Fan Zhigang
Development Characteristics Of Water-Conducting Fractured Zone In Deep Coal Seam Based On Microseismic Monitoring, Hou Enke, Fan Jichao, Xie Xiaoshen, Long Tianwen, Zhang Huanlan, Wang Jianhui, Fan Zhigang
Coal Geology & Exploration
The development height of the water conducting fractured zone is one of the important technical parameters for mine water hazards prediction. In this paper, the combined well-surface microseismic monitoring technology was used to analyze the development characteristics of the water conducting fractured zone in working face 4103 in Wenjiapo coal mine. The results showed that for deep buried coal seams, the microseismic events occured in the advance mining face with advanced influence angle ranging from the minimum of 28° to the maximum of 35°. The stability of overburden decreased due to the faults. Thus, compared with normal bedrock, the overburden …
Study On Time-Frequency Characteristics And Field Test Of Giant Magnetostrictive Acoustic Wave Seismic Source, Wang Zelun, Gao Hongxin, Yu Shijian, Wang Yongshen
Study On Time-Frequency Characteristics And Field Test Of Giant Magnetostrictive Acoustic Wave Seismic Source, Wang Zelun, Gao Hongxin, Yu Shijian, Wang Yongshen
Coal Geology & Exploration
Wide-band, high-power and short-residual acoustic wave sources are the key technology for high-resolution detection of large-scale complex structures, in order to solve the contradiction between detection distance and resolution, a new acoustic wave detection instrument is developed by using the acoustic transmitter made of giant magnetostrictive material(GMM) as the source. The focal center frequency is 5 kHz, and the excitation voltage is 300-600 V, it has the characteristics of large radiated sound power, short residual vibration(3.5 cycles) and frequency band width(1-3 kHz), which solves the problem of the high resolution acoustic wave detection. Its greatest advantage is that the acoustic …
Hydrochemical Characteristics And Formation Mechanism Of Ordovician Limestone Water In Baode Coal Mine, Zhang Zeyuan, Xu Feng, Wang Shidong, Liu Qisheng
Hydrochemical Characteristics And Formation Mechanism Of Ordovician Limestone Water In Baode Coal Mine, Zhang Zeyuan, Xu Feng, Wang Shidong, Liu Qisheng
Coal Geology & Exploration
Ordovician limestone karst water is the main threatening water source for mining activities in Baode coal mine, and it is one of the main water supply sources. Ordovician limestone karst water samples were systematically collected in Baode coal mine, and the methods of correlation analysis, ion proportional coefficient, saturation index inversion simulation and Chlor-Alkali index were chosen to analyze the hydrochemical characteristics and its formation mechanism. The results showed that the water quality types of Ordovician limestone water changed from runoff zone to stagnant zone in a trend of HCO3-Na(Na·Ca)→HCO3·Cl-Na·Ca(Ca·Mg)→Cl-Na(Na·Ca). The mass concentration of each ion …
Multi Parameter Monitoring System And Device For Mine Gas Drainage, Dai Chenyu
Multi Parameter Monitoring System And Device For Mine Gas Drainage, Dai Chenyu
Coal Geology & Exploration
In order to make up for the deficiency of the regional monitoring of the traditional gas drainage monitoring system, this paper proposes to build a borehole gas drainage monitoring system with borehole as the monitoring unit, which can dynamically grasp the drainage effect of each borehole in the process of gas drainage in real time, change the large area regional measurement into the measurement of each borehole in the region, and realize the fine monitoring of gas drainage. According to the requirements of borehole gas drainage monitoring system, combined with the characteristics of gas drainage parameters at the borehole orifice, …
Aggregation And Sedimentation Experiments Of Coal Fines With Different Particle Sizes During Cbm Development, Wei Yingchun, Cui Maolin, Zhang Jin, Meng Tao, Yao Zheng
Aggregation And Sedimentation Experiments Of Coal Fines With Different Particle Sizes During Cbm Development, Wei Yingchun, Cui Maolin, Zhang Jin, Meng Tao, Yao Zheng
Coal Geology & Exploration
During the development process of coalbed methane, the aggregation and sedimentation of coal fines can block the migration channel of coalbed methane and lead to accidents such as stuck pump and buried pump. In order to find out the aggregation and sedimentation characteristics of coal fines with different particle sizes, the aggregation and sedimentation experiments of coal fines with the particle size>140 mesh(<106 μm), 70 to 140 mesh(106-212 μm) and 50 to 70 mesh(212-300 μm) in deionized water were carried out. The aggregation and sedimentation characteristics of coal fines with different particle sizes in deionized water suspension were investigated from the suspension observation, the concentration characteristics of coal fines and the particle size distribution of coal fines in suspension. The results show that with the increase of the time, the color of coal fines suspension becomes lighter to different degrees, and the stratification of coal fines suspension gradually appears, and the suspension of coal fines with the particle size more than 140 mesh was the first to stratify among three suspensions. The smaller the particle sizes of coal fines, the more coal fines float on the top of the suspension, and the larger the particle sizes of coal fines, the more coal fines sink to the bottom of the suspension. The concentration of coal fines in the suspensions decreased to different degrees with the increase of the time. The concentration of coal fines decreased the fastest within 3 minutes after stopping the stirring. The concentration of coal fines with the particle sizes of 70 to 140 mesh in suspension was the largest among three suspensions. According to the particle size distribution curves, the process of aggregation and sedimentation of coal fines was divided into three stages: single peak to double peak(rapid floating and settlement of coal fines), double peak to single peak(rapid accumulation and settlement of coal fines) and single peak(slow sedimentation of coal fines). Coal fines with particle size more than 140 mesh in the suspension was the first to reach the stage of slow sedimentation, and coal fines with particle size of 70-140 mesh in the suspension reached the stage of slow sedimentation at the latest among three suspensions. The mechanism of aggregation and sedimentation of coal fines was discussed from the aspects of the force of coal fines, the extended DLVO theory, and the organic molecular structure of coal fines. The coal samples contain a large number of hydrophobic groups, such as aliphatic hydrocarbon and aromatic hydrocarbon, therefore, they have strong hydrophobicity and low wettability. With the decrease of particle sizes of coal fines, its specific surface area increases significantly, and a large amount of air is absorbed on the surface of coal fines, forming an air film. At the same time, particles of coal fines are adsorbed and aggregated with each other, and many micro pores are formed inside, resulting in that coal fines with small particle size is easy to aggregate and float on the suspension surface.
Evaluation And Analysis Of Paleoenvironments Of The Neogene Oil Shale Of Zhangcun Formation, Qinshui Basin, Liu Yanhai, Li Kunjie, Liu Dongna, Xue Shubin, Liu Yangfe, Chu Yonghui
Evaluation And Analysis Of Paleoenvironments Of The Neogene Oil Shale Of Zhangcun Formation, Qinshui Basin, Liu Yanhai, Li Kunjie, Liu Dongna, Xue Shubin, Liu Yangfe, Chu Yonghui
Coal Geology & Exploration
In order to deeply analyze the indication of oil shale development characteristics on paleoenvironments and provide theoretical guidance for oil shale resource evaluation, the organic geochemistry and elemental geochemistry characteristics of the Neogene Zhangcun Formation oil shale in the central part of the Qinshui basin were analyzed by Rock-Eval and TOC and the paleoclimate and paleogeographic environments of the depositional period were discussed as well. The results show that the oil shale of Zhangcun Formation has the low oil content which Tar=4.15%, higher hydrocarbon potential, kerogen is of sapropel type(I1), which has relatively shallow burial depth. The element …
Pyrolysis Characteristics And Pyrolysis Product Composition Of Bituminous Coal Under Weak Oxidizing Atmosphere, Zang Libin, Cui Hufeng, Li Qingchun
Pyrolysis Characteristics And Pyrolysis Product Composition Of Bituminous Coal Under Weak Oxidizing Atmosphere, Zang Libin, Cui Hufeng, Li Qingchun
Coal Geology & Exploration
In order to improve the light tar and gas yield, the yield distribution and composition characteristics of pyrolysis products of bituminous coal from Shaanxi Hongliulin in the nitrogen atmosphere and weak oxygen atmosphere were studied in a fixed bed reactor. The results showed that the yield of char and tar were reduced under the weak oxygen atmosphere, and the yield of CO and CO2 increased significantly, leading to the increase of total gas yield. Due to the oxidation combustion reaction, the yield of H2, CH4 and C2-C3 gradually decreased with the increase of …
Quantitative Evaluation Of The Contamination Degree Of The Drilling Fluid For Fractures Of Different Scale In Coal, Zhang Jingshuo, Ni Xiaoming, Li Yang, Li Zongyuan, Cao Yunxing
Quantitative Evaluation Of The Contamination Degree Of The Drilling Fluid For Fractures Of Different Scale In Coal, Zhang Jingshuo, Ni Xiaoming, Li Yang, Li Zongyuan, Cao Yunxing
Coal Geology & Exploration
During coalbed methane well drilling, the drilling fluid contaminates and blocks the pores and fractures of coal seam. In order to find out the difference of pollution degree of drilling fluid coal and the contribution rate of the pores and fractures of different scale to permeability, the coal of Changping mine was taken as the research object, the scanning electron microscopy(SEM) and the Image Pro Plus(IPP) processing technology were used, the parameters such as the average length, the average width, the total area and the total perimeter of the fractures of different scales in coal before and after contamination were …
Discussion On The Three-Dimensional Development Model Of The Old Well Pattern In Coalbed Methane Field, Li Jun, Zhang Cong, Zhang Jianguo, Peng He, Cui Xinrui, Zhu Min
Discussion On The Three-Dimensional Development Model Of The Old Well Pattern In Coalbed Methane Field, Li Jun, Zhang Cong, Zhang Jianguo, Peng He, Cui Xinrui, Zhu Min
Coal Geology & Exploration
In order to increase the degree of production of CBM development blocks, when the production of a single well enters a decline period, the development plan needs to be adjusted, and the production increase and stability can be achieved through the measures such as layer adjustment or layer compensation. In terms of time, it is believed that the main coal seam should be developed first when it is put into production. After the decline period, the secondary main coal seam should be supplemented and combined; in space, combined with the development dynamics, the analytic hierarchy process is used to determine …
Model Of Surface Subsidence Basin For Long-Wall Working Face Along Strike Of Gently Inclined Coal Seam, Tang Yichuan, Xing Congcong, Liu Donghai, Deng Niandong, Yao Ting, Shang Hui
Model Of Surface Subsidence Basin For Long-Wall Working Face Along Strike Of Gently Inclined Coal Seam, Tang Yichuan, Xing Congcong, Liu Donghai, Deng Niandong, Yao Ting, Shang Hui
Coal Geology & Exploration
In order to accurately describe the distribution of surface subsidence basin, and based on the power exponential function model and the subsidence features, the surface subsidence basin model of long-wall working face along strike with gently inclined coal seam was established concerned the combination of theoretical analysis and numerical simulation method. The influencing factors of model parameters and the changing patterns of parameters were analyzed, and the applicability and the predicting accuracy of the model were verified. The results showed that parameter n reflected the range of the bottom size of the sinking basin, which was mainly related to the …
Sedimentary Response To The Uplift Of The Liupan Shan Since The Late Pleistocene And Its Environmental Effects, Ma Zhaoying, Dong Xiaopeng, Zhang Qing, Cui Jiawei
Sedimentary Response To The Uplift Of The Liupan Shan Since The Late Pleistocene And Its Environmental Effects, Ma Zhaoying, Dong Xiaopeng, Zhang Qing, Cui Jiawei
Coal Geology & Exploration
Liupan Shan lies between the Tibetan plateau and Ordos block and has been under the remote effect of the northeastward extension of the Tibetan plateau. The former research about the uplift of Liupan Shan mainly focused on the petrology, structural deformation or tectonic evolution study from the Cretaceous to early period of Cenozoic. However, the Late Pleistocene geological study closely connected with the human activities was rarely mentioned. In this study, we carried out systematic sedimentary research in the Qingshuihe basin adjacent to the Liupan Shan tectonic belt, re-determine the sedimentary sequence at first, then reverse the uplift history of …
Simulation Of The Cutter Arrangement Pattern Of The Arc Pdc Drill Bit, Ju Pei, Wang Chuanliu
Simulation Of The Cutter Arrangement Pattern Of The Arc Pdc Drill Bit, Ju Pei, Wang Chuanliu
Coal Geology & Exploration
When drilling in a complex heterogeneous formation, due to the limitation of bit crown shape, the cutters of each part of the bit are subjected to non-uniform force, and the cutters at the local location are subjected to large impact load, which lead to the occurrence of bit vortex. In order to solve the problem, a “multi-level force balance” cutter circumferential arrangement scheme is proposed. By establishing the rock breaking finite element simulation model of the bit, the mechanical characteristics of the cutter and the bit under three circumferential cutter distribution modes(clockwise, counterclockwise and “multi-level force balance”) are analyzed. Simulation …
Simulation And Experimental Study On Dynamic Characteristics Of Radial Piston Hydraulic Chuck, Liang Chunmiao, Yao Ningping, Yao Yafeng, Li Kun, Peng Tao, Song Haitao
Simulation And Experimental Study On Dynamic Characteristics Of Radial Piston Hydraulic Chuck, Liang Chunmiao, Yao Ningping, Yao Yafeng, Li Kun, Peng Tao, Song Haitao
Coal Geology & Exploration
The chuck is an important part of the coal mine tunnel drilling rig. The performance of the chuck directly affects the efficiency and quality of drilling. Aiming at the problems of the rubber cylinder hydraulic chuck. a new radial piston hydraulic chuck is studied. The objective of this paper is to devise a new radial piston hydraulic chuck instead of rubber-sleeve hydraulic chuck. Then, the motion mathematical model of radial piston hydraulic chuck was established based on the radial piston chuck clamping and loosening of system structure and working principle. At the same time, a dynamic co-simulation of chuck hydraulic …
Progress In The Research On The Raw Materials And The Preparation Techniques Of Coal-Based Graphene, Li Ruiqing, Tang Yuegang, Huan Xuan, Fan Jiangtao, Che Qili
Progress In The Research On The Raw Materials And The Preparation Techniques Of Coal-Based Graphene, Li Ruiqing, Tang Yuegang, Huan Xuan, Fan Jiangtao, Che Qili
Coal Geology & Exploration
Graphene is an emerging carbon nanomaterial in the 21st century, has excellent properties and shows great application potential in many fields. Coal is the most abundant and the cheapest carbon source with unique structure and material composition. The application of coal in the development and the application of new carbonaceous materials such as graphene and their composites is a work worthy of further exploration. The development of coal-based graphene can both promote the clean utilization of coal and enhance the added value of coal resources. In this paper, the research developments in coal structure, the mechanism of coal graphitization, as …
H2S Occurrence Conditions And Genetic Types Of Low Rank Bituminous Coal In Binchang Mining Area, Liu Huibin, He Wanying, Jiang Bo
H2S Occurrence Conditions And Genetic Types Of Low Rank Bituminous Coal In Binchang Mining Area, Liu Huibin, He Wanying, Jiang Bo
Coal Geology & Exploration
Based on the analysis of geological characteristics of the study area, it is considered that the geological conditions of H2S occurrence are the capping effect of dense surrounding rock on the roof and floor, the water-conducting fractured zone is unable to guide the overlying aquifer, and the low degree of coal metamorphism is not conducive to H2S adsorption, resulting in maximum H2S concentration of about 0.001 4% in the main mined coal seam 4 during the construction of Yadian mine at the north of Binchang mining area. Through the analysis of sulfur distribution, sulfate …
Table Of Contents, The Editors
Progressive Gas Extraction Technology In Broken Soft Coal Seam Of Qinglong Coal Mine, Guizhou Province, Liang Daofu, Cao Jianming, Dai Mao, Chu Zhiwei, Zhang Lei
Progressive Gas Extraction Technology In Broken Soft Coal Seam Of Qinglong Coal Mine, Guizhou Province, Liang Daofu, Cao Jianming, Dai Mao, Chu Zhiwei, Zhang Lei
Coal Geology & Exploration
Aiming at the problems of uncontrollable trajectory, shallow borehole depth and poor gas extraction effect in gas treatment drilling of broken soft coal seam in Qinglong coal mine, the regional progressive gas extraction technology in broken soft coal seam based on compressed-air directional drilling was proposed, on the basis of analyzing the technical bottleneck of existing gas extraction borehole with rotary drilling. The principle and advantage of the technology was expounded, the technology of directional drilling by compressed-air, the technology of long distance in-seam drilling, and the technology of compound slag discharge by double power were integrated. The field test …
Geological Modeling-Based Productivity Response Characteristics Of The Cbm Well In Baode Unitⅰ, Chen Bo, Tang Dazhen, Lin Wenji, Li Song, Zhong Guanghao, Zhu Xueguang
Geological Modeling-Based Productivity Response Characteristics Of The Cbm Well In Baode Unitⅰ, Chen Bo, Tang Dazhen, Lin Wenji, Li Song, Zhong Guanghao, Zhu Xueguang
Coal Geology & Exploration
Coalbed methane resource conditions and reservoir physical conditions are the basis of CBM exploration and exploitation. The geological modeling of CBM reservoir was carried out to clarify the spatial distribution of coal reservoir, and explain the difference of single well productivity, which can provide theoretical basis for selection and well drilling. This paper took Baode unit I as research object. Based on the measured data of gas content and well test permeability, the inversion model of gas content and permeability in the study area was established by using support vector machine algorithm(SVM) and transformed F-S permeability calculation formula, and the …
The Pca-Logistic Method For Identification Of Water Burst In Nalinhe No.2 Coal Mine, Ji Zhuochen, Ding Xiang, Hou Enke, Pu Zhiguo, Xie Peng
The Pca-Logistic Method For Identification Of Water Burst In Nalinhe No.2 Coal Mine, Ji Zhuochen, Ding Xiang, Hou Enke, Pu Zhiguo, Xie Peng
Coal Geology & Exploration
Nalinhe No.2 coal mine is the first pair of large-scale mines in the Nalinhe mining area. The water inrush events occur from time to time due to its own complex hydrogeological conditions and strong disturbance of excavation in the initial stage of production, which has caused serious threat to the mining activity safety. Finding the source of gushing water quickly and effectively is the key to control the mine water disaster. Based on the water quality analysis of main aquifers and goaf water samples in Nalinhe No.2 coal mine, and drawing the piper trilinear nomograph water samples, the hydrogeochemical characteristics …
Experimental Study On Bearing Characteristics Of Filled Piers In Coal Mine Goaf, Zhu Shibin
Experimental Study On Bearing Characteristics Of Filled Piers In Coal Mine Goaf, Zhu Shibin
Coal Geology & Exploration
The high concentration slurry is poured into the goaf to form filled piers. The bearing capacity of the piers to the superstructure are affected by the overlap size. In order to grasp the influence of the overlap size on the bearing capacity of the overlying rock layer, high concentration slurry was prepared which selected cement as the cementing material, standard sand as the aggregate. 3D printing technology was used to make the mold to produce the overlapped round table samples. The uniaxial compression test was carried out. Test results show that, when the top area and height of each single …
Method And Practice Of Quality Test After Grouting In Coal Mine Goaf, Liu Xiaoping, Li Shan, Liu Xinxing, Cao Xiaoyi, Wang Yutao
Method And Practice Of Quality Test After Grouting In Coal Mine Goaf, Liu Xiaoping, Li Shan, Liu Xinxing, Cao Xiaoyi, Wang Yutao
Coal Geology & Exploration
Grouting quality test is the key technology for efficient development and utilization of waste land in the goaf of a coal mine, it is of great significance to evaluate the stability of the site and the safety of construction after goaf management. Based on many engineering practices, this paper summarizes the evaluation method of the qualified standards of the grouting quality and the errors existed in the testing work. The results proved that the quality inspection after grouting is a systematic work. The test method could be optimized according to the characteristics of the construction and grouting design requirements, following …
Expansion Mechanism And Control Measures Of High Concentration Slurry Filling In Cavity Goaf Of Coal Mine, Wu Boqiang, Wang Xiaodong, Zhu Shibin
Expansion Mechanism And Control Measures Of High Concentration Slurry Filling In Cavity Goaf Of Coal Mine, Wu Boqiang, Wang Xiaodong, Zhu Shibin
Coal Geology & Exploration
The filling expansion mechanism and control measures of high concentration slurry in goaf is one of the difficult problems to be solved in the filling treatment of cavity goaf. Based on this, combined with the high concentration slurry transportation and rheological theory, a high concentration slurry filling process model was constructed to reveal its expansion mechanism, the dynamic and resistance calculation methods of filling expansion process were studied, the main influencing factors and control methods of filling accumulation body morphology were determined, and the theoretical results were verified by outdoor filling test.The results show that the the relative error between …
Damaged Constitutive Model Of Frozen Sand Under The Influence Of Intermediate Principal Stress, Ma Shilong, Yao Zhaoming, Liu Shuang, Pan Xuan
Damaged Constitutive Model Of Frozen Sand Under The Influence Of Intermediate Principal Stress, Ma Shilong, Yao Zhaoming, Liu Shuang, Pan Xuan
Coal Geology & Exploration
Artificial freezing is a commonly used method for stopping water and providing temporary support during the excavation of saturated sand. This study on the damage characteristics of frozen soil lays the foundation for the analysis of the mechanical properties of frozen soil and the stability of frozen bodies. In order to study the damage mechanical properties of frozen sand, three-dimensional laboratory tests on frozen sand with different intermediate principal stress coefficients were carried out at -5℃. Based on the Weibull random distribution of micro element failure of frozen soil, the Drucker-Prager strength criterion was invoked as the statistical distribution variable, …
Numerical Experiment On Damage And Fracture Of Shale Based On Micro-Scale, Cui Hengtao, Wu Zhonghu, Lou Yili, Zuo Yujun, Sun Wenjibin, Liu Hao
Numerical Experiment On Damage And Fracture Of Shale Based On Micro-Scale, Cui Hengtao, Wu Zhonghu, Lou Yili, Zuo Yujun, Sun Wenjibin, Liu Hao
Coal Geology & Exploration
Correctly understanding the micro-scale fracture characteristics of the Lower Cambrian shale and the evolution law of acoustic emission signals are of great reference value in the study of shale mechanical characteristics, fracture mechanism and shale gas development and utilization. In this paper, based on digital image processing technology, the non-uniform characterization of quartz-filled shale is carried out, and a numerical model is established using the real rock fracture analysis system RFPA2D-DIP to simulate the failure process of shale under different confining pressures. The test results show that under the micro-scale structure, the shale failure mode can be roughly …
Characteristics Of In-Situ Stress Field And Stability Analysis Of Roadway In Hongqingliang Coal Mine, Rong Hai, Han Yongliang, Zhang Hongwei, Xin Jinxin, Cao Yu, Lan Tianwei
Characteristics Of In-Situ Stress Field And Stability Analysis Of Roadway In Hongqingliang Coal Mine, Rong Hai, Han Yongliang, Zhang Hongwei, Xin Jinxin, Cao Yu, Lan Tianwei
Coal Geology & Exploration
The in-situ stress of 3-1 coal seam in Hongqingliang coal mine was measured by hollow core inclusion measurement, and distribution characteristics of in-situ stress field were obtained in order to solve the problem of serious deformation in mining roadway. Fault structures of grade Ⅰ-Ⅴ in Hongqingliang coal mine were divided by geo-dynamic division method, and the stress areas were divided and the stability of roadways was analysis by rock stress state analysis system. The research showed that the in-situ stress field in Hongqingliang coal mine belongs to the horizontal tectonic stress field, which is dominated by horizontal compressive stress. The …
Numerical Simulation Of Coaxial Heat Transfer Capacity Of Deep Vertical Wells, Zhao Chunhu, Shang Hongbo, Jin Dewu, Wang Hao, Xu Shuanhai, Wang Xiaodong, Zhang Weidong
Numerical Simulation Of Coaxial Heat Transfer Capacity Of Deep Vertical Wells, Zhao Chunhu, Shang Hongbo, Jin Dewu, Wang Hao, Xu Shuanhai, Wang Xiaodong, Zhang Weidong
Coal Geology & Exploration
Aiming at the scientific evaluation of coaxial casing heat transfer of geothermal resources with medium burial depth(1 500-4 000 m), a rock-water coupled heat transfer model of a vertical single well was built based on the simulation platform of COMSOL Multiphysics software. Taking the stratigraphic and geothermal characteristics of Xi'an area as the simulation background, the heat transfer capacity of single well(3 500 m)casing under two different geothermal gradients(0.027℃/m and 0.030℃/m) and four flow velocities(0.25, 0.50, 0.75, 1.00 m/s) was calculated and analyzed. Meanwhile, the numerical models of group wells with five kinds of well spacing were established, and the …