Mechanism Of Coal Fine-Bubble Coupling In The Unsaturated Flow Stage Of Coalbed Methane Drainage,
2023
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
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 …
Optimization Of Cemented Filling Material Ratio Based On Rsm-Bbd Method And Engineering Application,
2023
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
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 …
Mechanical Properties And Mechanism Of Co-Curing Saline Soil With Coal Solid Waste,
2023
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science, Wuhan 430071, China
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 …
Wavefield Separation Of P- And S-Waves Based On Modified Pseudo-Helmholtz Decomposition Operator In Transverse Isotropic Media,
2023
Shandong Provincial Key Laboratory of Deep Oil & Gas, China University of Petroleum (East China), Qingdao 266580, China
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, …
Forward Modeling Of Radio-Magnetotelluric Method Based On Julia Acceleration And Study On Effect Of Displacement Current,
2023
Engineering Research Center of Nuclear Technology Application (East China University of Technology), Ministry of Education, Nanchang 330013, China; School of Geophysics and Measurement-Control Technology, East China University of Technology, Nanchang 330013, China
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 …
One Surface Borehole With Multi-Usage Gas Drainage Key Technology For Abandoned Well And Its Application,
2023
CCTEG Chongqing Research Institute, Chongqing 400037, China; State Key Laboratory of Gas Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
One Surface Borehole With Multi-Usage Gas Drainage Key Technology For Abandoned Well And Its Application, Fu Junhui
Coal Geology & Exploration
Gas drainage from mining area could be realized through the reconstruction and reuse of abandoned surface gas wells in the coal mine area , which has multiple economic and environmental benefits such as ensuring the safe production of mining, the effective utilization of gas resources, and reducing the pressure of gas escape on the environment. In view of this purpose, the idea of “one surface borehole with multi-usage” gas drainage technology for abandoned wells was proposed based on the characteristics of the surface borehole and the abandoned wells in the mining area. By analyzing the conditions of the mining technology, …
New Understanding Of Coal Seam Distribution Law: Coal Accumulation Model Controlled By Paleoclimate Evolution,
2023
College of Mining, Liaoning Technical University, Fuxin 123000, China
New Understanding Of Coal Seam Distribution Law: Coal Accumulation Model Controlled By Paleoclimate Evolution, Hou Haihai, Chen Hongzhen, Shao Longyi, Pan Zizi
Coal Geology & Exploration
It is very important for coal and coal-measure gas exploration to correctly understand the distribution law of coal seam and its main control factors in different coal accumulation models. Based on the review of the theories and models of paleogeographic coal control, coal accumulation in sequence stratigraphy, allochthonous coal accumulation and multiple coal accumulation theoretical system, a new coal accumulation model under the control of climatic revolution was proposed through the analyses of the Jurassic coal-bearing strata in the southern margin of Junggar Basin. The paleotemperature and paleohumidity during Badaowan Formation(coal accumulation period), Sangonghe Formation, Xishanyao Formation (coal accumulation period) …
A New Model Of Surface And Underground Integrated Three-Dimensional Prevention And Control Of Rock Burst In Binchang Mining Area,
2023
Shaanxi Binchang Mining Group Co., Ltd., Xianyang 712000, China; Binchang Mining Area Disaster Comprehensive Control Engineering Research Center, Xianyang 713602, China
A New Model Of Surface And Underground Integrated Three-Dimensional Prevention And Control Of Rock Burst In Binchang Mining Area, Wu Xueming, Ma Xiaohui, Lyu Dazhao, Zheng Kaige, Wang Dongjie
Coal Geology & Exploration
With the continuous increase of coal mining intensity, the mine gradually moves to the deep, bringing about increasingly serious rock burst hazard. The deep rock burst mines often have one or more layers of hard and thick rock strata. These hard roofs are thick and strong integrity. When they suddenly rupture, they can release a large amount of elastic energies, which can easily to cause rock burst accidents and seriously restrict the safety of mine production. Herein, appropriate treatment measures were put forward for the special situation of deep burial depth of coal seam and general presence of many kinds …
Co2-Ecbm Simulation Study Considering Klinkenberg Factor State,
2023
School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
Co2-Ecbm Simulation Study Considering Klinkenberg Factor State, Sa Zhanyou, Wu Jingbo, Yang Yongliang, Zhang Xin, Lu Shouqing, Liu Jie, Wang Hao
Coal Geology & Exploration
In order to explore the role of Klinkenberg effect and Klinkenberg factor in different states in the process of CO2-Enhanced Coal Bed Methane (CO2-ECBM), the effects of Klinkenberg factor of zero, fixed Klinkenberg factor and dynamic Klinkenberg factor on CO2-ECBM were simulated and analyzed by COMSOL finite element software. The dynamic changes of CH4 and CO2 pressure with this factor were studied, and the CH4 gas production was compared with the engineering practice. The results show that the effective permeability of CH4 and CO2 increases slowly at first, then …
Study On The Time Law Of Water-Rock Interaction In Coal Mine Groundwater Reservoir,
2023
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Study On The Time Law Of Water-Rock Interaction In Coal Mine Groundwater Reservoir, Zhang Kai, Liu Shuyu, Cao Zhiguo, Gao Ju, Chen Xiangyu, Yan Jiayu
Coal Geology & Exploration
The retention time of mine water in the coal mine underground reservoir will affect the ion concentration of effluent, but the time law of water-rock interaction during operation of the reservoir is still unclear. In order to reveal the occurrence type and intensity of water-rock interaction in different operation stages of coal mine underground reservoir, two groups of static simulation tests of water-rock interaction were designed based on the test and analysis on-site samples, namely the fine sandstone-mine water (S-K) and mudstone-mine water (N-K). The types of water-rock interaction were analyzed from two aspects: the change of rock composition and …
Deformation Prediction Of Open-Pit Mine Slope Based On Abc-Grnn Combined Model,
2023
Department of Earth Science and Engineering, Shanxi Institute of Technology, Yangquan 045000, China; Shanxi Key Laboratory of Mine Ecological Restoration and Solid Waste Recycle, Shanxi Institute of Technology, Yangquan 045000, China
Deformation Prediction Of Open-Pit Mine Slope Based On Abc-Grnn Combined Model, Ning Yongxiang, Cui Ximin, Cui Jianguo
Coal Geology & Exploration
Accurate prediction of slope deformation in open-pit mine is an important guarantee for effective disaster early warning of slope. The traditional slope deformation prediction method is unable to characterize and comprehensively analyze the effect of various factors on slope deformation. In view of this, the combined prediction model (ABC-GRNN) of an artificial bee colony algorithm (ABC) and the optimized generalized regression neural network (GRNN) was proposed for slope deformation in open-pit mine. In this prediction model, the following 5 factors affecting the slope deformation of open-pit mine are considered comprehensively: mining disturbance, rainfall, rainfall duration, temperature and humidity. Herein, the …
Influence Of Coal Mining Disturbance On Soil Physiochemical Properties And The Response Mechanism Of Microbial Community,
2023
State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 100011, China
Influence Of Coal Mining Disturbance On Soil Physiochemical Properties And The Response Mechanism Of Microbial Community, Song Ziheng, Liu Gang, Sun Liping, Wang Fei, Guo Junting
Coal Geology & Exploration
The ecological problems caused by coal mining in Yellow River Basin are becoming more serious. In order to explore the influence characteristics of coal mining disturbance on soil factors and microbial community in Yellow River Basin, and to clarify the differences in soil microbial communities between the marginal coal mining subsidence area and the unmined area, equidistant sampling was performed from the marginal subsidence area, the start point (HD), to the unmined area in the study area of Shangwan Mine in Inner Mongolia. Specifically, sampling points at 150 (D1), 300 (D2), 450 (D3), 600 (D4) and 750 m (D5) from …
Feasibility Study Of Nature Source In-Seam Exploration,
2023
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Feasibility Study Of Nature Source In-Seam Exploration, Hu Ze’An, Cao Lingkai, Liu Qinjie, Ji Guangzhong, Xi Chaoqiang, Wu Rongxin
Coal Geology & Exploration
The conventional explosive seismic sources are very tightly controlled in high-gas mine, and a novel non-explosive channel wave method is urgently needed as an alternative. Therefore through the theoretical analysis and numerical simulation experiments, we demostrated that the coal seam satisfied the geophysical conditions to develop the nature source in-seam wave. The time-domain numerical simulation experiment of the passive source channel wave was successfully realized by constructing the nature source in-seam wave model with three stochastic terms, including the stochastic spatial position, stochastic initial excitation time and stochastic amplitude of seismic source. We performed frequency dispersion spectrum calculation on the …
Inversion Of Self-Potential Data Based On Improved Sparrow Search Algorithm,
2023
School of Geophysics and Measurement Control Technology, East China University of Technology, Nanchang 330013, China
Inversion Of Self-Potential Data Based On Improved Sparrow Search Algorithm, Lang Jianxiang, Tang Hongzhi, Ai Hanbing
Coal Geology & Exploration
Self-potential (SP) method is a natural source geophysical prospecting technology with low cost and simple operation for field observation. Generally, the inversion of SP data has the characteristics of ill-posedness and non-linearity. The conventional inversion algorithms are classified into the types of local optimization and global search. However, it is hard for the gradient-based local optimization algorithm to obtain the global optimal solution, and the inversion results are dependent on the construction of initial model. The traditional global search algorithm has the disadvantages of low convergence rate, insufficient ability of escaping local minima and instability. Thus, a new global optimization …
Development Of Storage Equipment Of Continuous Cable Pipe For Borehole Rescue,
2023
College of Construction Engineering, Jilin University, Changchun 130061, China; Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun 130061, China
Development Of Storage Equipment Of Continuous Cable Pipe For Borehole Rescue, Gao Ke, Niu Xin, Zhao Yan, Qin Xiaolin, Lyu Xiaoshu, Xie Xiaobo
Coal Geology & Exploration
The double-bit bionic self-balancing continuous drilling technology has the advantages including requiring no drilling rig, high drilling speed and slight disturbance to the borehole wall. It is one of the key potential technologies for constructing the security and rescue passages against mine disasters. In this technology, as there are passages for power supply, signal, chip removal and other aspects that are built in the continuous cable pipe, it is required that there shall be no such interference, extrusion or arrangement of dynamic/static conductive electric conduction link as in using the existing drum hoist to store continuous pipes during storage. Therefore, …
A Fault Diagnosis Method Of Rescue Lifting Vehicle Based On Spectral Clustering,
2023
Xuzhou Heavy Machinery Co., Ltd., Xuzhou 221004, China
A Fault Diagnosis Method Of Rescue Lifting Vehicle Based On Spectral Clustering, Li Lijing, Chang Dashuai, Li Lei, Chai Junfei
Coal Geology & Exploration
In allusion to the characteristics of complex structure of rescue lifting vehicle, the poor independence of working condition and fault data, and the difficulty in fault diagnosis, we proposed a fault diagnosis algorithm of rescue lifting vehicle with the semi-supervised support vector machine in this paper. In the algorithm, the information on hidden features of the original fault data was mined with the idea of spectral clustering, to effectively distinguish the independent structural features of the fault information in the component system with different degrees of coupling. Firstly, a fault map was established based on the original input data. Then, …
Incorporating Environmental Impacts Into Short-Term Mine Planning: A Literature Survey,
2023
Université Laval
Incorporating Environmental Impacts Into Short-Term Mine Planning: A Literature Survey, Milad Rahnema, Bahar Amirmoeini, Ali Moradi Afrapoli
Mining Engineering Faculty Publications
This paper aims to address the significant financial, environmental, and social risks posed by climate change to the mining industry, which is responsible for approximately 8% of global greenhouse gas emissions. With 70% of mining projects for the six largest mining companies located in water-stressed regions, the industry is facing increasing pressure to reduce its impact. Our study investigates the applicability of multi-objective optimization to integrate environmental impact considerations into short-term planning for mining operations. To achieve this, we have reviewed similar studies in various industries and developed an integrated planning framework that incorporates environmental considerations into production planning for …
Are Natural Fractures In Sandstone Reservoir: Water Wet – Mixed Wet – Or Oil Wet?,
2023
Missouri University of Science and Technology
Are Natural Fractures In Sandstone Reservoir: Water Wet – Mixed Wet – Or Oil Wet?, Salah Almudhhi, Laila Abdullah, Waleed Al-Bazzaz, Saleh Alsayegh, Hussien Alajaj, Ralph E. Flori
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
This study accurately measures the wettability contact angle of native Kuwaiti sandstone reservoir that hosts mixed pore size distributions in both the tight sandstone matrix as well as the natural fracture (NF) embedded in it. Also, this study, effectively, investigates the geometrical size and shape of natural available voids whether matrix voids or NF voids captured in the rock 2D image frame system. Correspondingly, this study is, successfully, measure tight matrix, NF Pore wall, and NF pore opening wettability performance and recovery efficiency contributions inside the sandstone reservoir. A model pore/ grain contact angle wettability is generated. Therefore, this study …
Studies On The Enrichment Feasibility Of Rare Earth-Bearing Minerals In Mine Tailings,
2023
Missouri University of Science and Technology
Studies On The Enrichment Feasibility Of Rare Earth-Bearing Minerals In Mine Tailings, Jose L. Corchado-Albelo, Lana Z. Alagha
Mining Engineering Faculty Research & Creative Works
This Study Aimed to Investigate the Potential of Enrichment of Rare-Earth-Bearing Minerals in Historic Mine Tailing using the Froth Flotation Process. Characterization Studies Indicated that Tailings Contained 11,000 Ppm of Rare Earth Elements (REEs). the Major Mineral in the Tailings Was Apatite at ~84%, Which Was Associated with Iron Oxides (~16%). TESCAN's Integrated Mineral Analysis (TIMA) Showed that Monazite Was the Main REE Mineral, and 69% of Monazite Was Locked in Apatite Grains. Characterization Studies Suggested that the Separation of REEs-Bearing Apatite from Iron Oxides is Possible using Froth Flotation, Wherein Apatite Was Floated and Iron Oxides Were Depressed. Zeta …
Evaluating The Effect Of Overburden Depth, Mining Height, And Support Density On Coal Rib Damage Using Dem Modeling,
2023
Missouri University of Science and Technology
Evaluating The Effect Of Overburden Depth, Mining Height, And Support Density On Coal Rib Damage Using Dem Modeling, Maurice Sunkpal, Taghi Sherizadeh, Dogukan Guner
Mining Engineering Faculty Research & Creative Works
There Has Been a Global Effort in the Past Decade, Especially in Major Coal-Producing Countries, toward Understanding the Mechanics Involved in the Stability of Coal Mine Ribs. Buckling and Spalling of Mine Ribs Are Known to Have an Impact on their Stability and Degradation. the Generation, Propagation, and Coalescence of Cracks in Mine Pillar Ribs Are Significantly Affected by the overburden Depths. in Addition, the in Situ Stress Magnitudes Tend to Affect the Rib Damage Process. High Horizontal Stresses and Increased Depths Can Lead to Unfavorable Stress Conditions, Inducing Coal Mass Damage and Strength Loss. Understanding the Dynamics Involved in …
