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Hydraulic support crushed mechanism for the shallow seam mining face under the roadway pillars of room mining goaf

International Journal of Mining Science and Technology 2017年第5期27卷 853-860页

作者： Wang Fangtian Duan Chaohua Tu Shihao Liang Ningning Bai Qingsheng State Key Laboratory of Coal Resources and Mine Safety China University of Mining&TechnologyXuzhou 221116China School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of Education of ChinaChina University of Mining&TechnologyXuzhou 221116China School of Economics and Management Longyan UniversityLongyan 364000China

While the fully-mechanized longwall mining technology was employed in a shallow seam under a room mining goaf and overlained by thin bedrock and thick loose sands, the roadway pillars in the abandoned room mining goaf were in a stress-concentrated state, which may cause abnormal roof weighting, violent ground pressure behaviours, even roof fall and hydraulic support crushed(HSC) accidents. In this case,longwall mining safety and efficiency were seriously challenged. Based on the HSC accidents occurred during the longwall mining of 3-1-2 seam, which locates under the intersection zone of roadway pillars in the room mining goaf of 3-1-1 seam, this paper employed ground rock mechanics to analyse the overlying strata structure movement rules and presented the main influence factors and determination methods for the hydraulic support working resistance. The FLAC3 D software was used to simulate the overlying strata stress and plastic zone distribution characteristics. Field observation was implemented to contrastively analyse the hydraulic support working resistance distribution rules under the roadway pillars in strike direction, normal room mining goaf, roadway pillars in dip direction and intersection zone of roadway pillars. The results indicate that the key strata break along with rotations and reactions of the coal pillars deliver a larger concentrated load to the hydraulic support under intersection zone of roadway pillars than other conditions. The ‘‘overburden strata-key strata-roadway pillars-immediate roof" integrated load has exceeded the yield load that leads to HSC accidents. Findings in HSC mechanism provide a reasonable basis for shallow seam mining, and have important significance for the implementation of safe and efficient mining.

关键词： Shallow seam Room mining goaf Longwall mining Hydraulic support crushed mechanism Safe and efficient mining

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Numerical simulation analysis of covering rock strata as mining steep-inclined coal seam under fault movement

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中国有色金属学会会刊：英文版 2011年第S3期21卷 556-561页

作者： MA Feng-hai, SUN Li, LI Dun College of Civil and Architectural Engineering, Dalian University, Dalian 116622, China College of Civil and Architectural Engineering Dalian University Dalian 116622 China

The fault is one important factor for the stability of overburden strata caused by steeply inclined coal seam. The stress and displacement change of overburden strata caused by steeply-inclined coal seam mining activity under faulting was simulated by FLAC2D finite differential program on the basis of Zhaogezhuang mining example belonging to Kailuan Mining Group. From the results, the stress and displacement clouding image after mining became complex because of the fault, that is, a kind of weak structural plane. The stress concentration region concentrated around the goaf, and also around the fault plane. As the mining depth increases, the stress and displacement within the fault zone change significantly. This movement and deformation characteristic of overburden strata can provide theoretical basis for the similar mining condition.

关键词： fault steep-inclined coal seam numerical simulation overburden distortion

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Strength criterion effect of the translator and destabilization model of gas-bearing coal seam

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International Journal of Mining Science and Technology 2019年第2期29卷 327-333页

作者： Gang Wang Rui Wang Mengmeng Wu Cheng Fan Xiang Song Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base Shandong University of Science & Technology College of Mining and Safety Engineering Shandong University of Science & Technology Department of Civil and Architectural Engineering City University of Hong Kong

Coal seam destabilization inflicts damage to equipment, causes property loss and personnel casualties,and severely threatens mining safety and efficient production. To further understand this destabilization based on the basic theory of Lippmann seam destabilization, a mathematical model was introduced for gas pressure distribution by considering intermediate principal stress and support ***, we established a translation model suitable for the entire roadway coal seam with rocky roof and floor by applying the unified form of yield criterion in the state of plane strain. We also obtained the analytic expressions of coal seam stress distribution on both sides of the roadway and the widths of plastic and disturbance zones. Afterward, we analyzed several typical cases with different material yield criteria, obtained the plastic zone widths of the coal seam under different gas pressures, and assessed the effects of support resistance, roadway size, and coal strength on coal seam destabilization. Results showed that: the results obtained on the basis of Wilson and Mohr–Coulomb criteria are considerably conservative, and the use of Druker–Prager criteria to evaluate the rockburst-induced coal seam destabilization is safer than the use of the two other criteria; coal seam stability is correlated with gas pressure;and high-pressure gas accelerates the coal seam destabilization.

关键词： Coal seam destabilization Strength criterion effect Gas Stress distribution

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Influential factors and control of water inrush in a coal seam as the main aquifer

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International Journal of Mining Science and Technology 2018年第2期28卷 187-193页

作者： Gao Rui Yan Hao Ju Feng Mei Xianchen Wang Xiulin Key Laboratory of Deep Coal Resource Mining Ministry of Education School of Mines China University of Mining and Technology State Key Laboratory for Geomechanics & Deep Underground Engineering China University of Mining and Technology Huadian Coal Industry Group Co. Ltd.

In this paper, a combination of field measurement, theoretical analysis and numerical simulation were used to study the main control factors of coal mine water inrush in a main aquifer coal seam and its control scheme. On the basis of revealing and analyzing the coal seam as the main aquifer in western coal mine of Xiao Jihan coal mine, the simulation software of PHASE-2D was applied to analyze the water inflow under different influencing factors. The results showed that water inflow increases logarithmically with the coal seam thickness, increases as a power function with the permeability coefficient of the coal seam, and increases linearly with the coal seam burial depth and the head pressure; The evaluation model for the factors of coal seam water inrush was gained by using nonlinear regression analysis with SPSS. The mine water inrush risk evaluation partition within the scope of the mining field was obtained,through the engineering application in Xiao Jihan coal mine. To ensure the safe and efficient production of the mine, we studied the coal mine water disaster prevention and control measures of a main aquifer coal seam in aspects of roadway driving and coal seam mining.

关键词： Coal seam Main aquifer Water inrush Influential factors Control

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Analysis of stability of coal pillars with multi-coal seam strip mining

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中国有色金属学会会刊：英文版 2011年第S3期21卷 549-555页

作者： ZHANG Li-ya, DENG Ka-zhong, ZHU Chuan-guang, XING Zheng-quan Jiangsu Key Laboratory of Resources and Environmental Information Engineering, China University of Mining and Technology, Xuzhou 221116, China Jiangsu Key Laboratory of Resources and Environmental Information Engineering China University of Mining and Technology Xuzhou 221116 China

Strip mining is one of the efficient measures to control surface subsidence and mining damage. However, the researches on the laws of the geological mining factors to upper and lower pillar's stability are still deficient in multi-coal seam strip mining at present. Based on the three dimension fast Lagrangian analysis of continua (short for FLAC3D) numerical simulation software, the laws of the stress increasing coefficient on the coal pillar and its stability were systematically studied for different depths, different mining widths, different interlayer spacings, different mining thicknesses, different properties of interstratified rock and the spacial relations of the upper and lower pillars in vertical alignment in multi-coal seam strip mining. The function relation between the stress increasing coefficient of upper and lower pillars with the mining depth, mining widths, interlayer spacing, mining thickness, property of interstratified rock and the spatial relationship were obtained.

关键词： multi-coal seam strip mining FLAC3D numerical simulation stability of coal pillar

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Discerning Weld seam Pro les from Strong Arc Background for the Robotic Automated Welding Process via Visual Attention Features

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Chinese Journal of Mechanical Engineering 2020年第1期33卷 170-181页

作者： Yinshui He Zhuohua Yu Jian Li Lesheng Yu Guohong Ma School of Environment and Chemical Engineering Nanchang UniversityNanchang 330031China School of Mechanical Engineering Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi ProvinceNanchang UniversityNanchang 330031China Institute of Technology.East China Jiao Tong University Nanchang 330100China

In the robotic welding process with thick steel plates,laser vision sensors are widely used to profile the weld seam to implement automatic seam *** weld seam profile extraction(WSPE)result is a crucial step for identifying the feature points of the extracted profile to guide the welding torch in real *** visual information processing system may collapse when interference data points in the image survive during the phase of feature point identification,which results in low tracking accuracy and poor welding *** paper presents a visual attention featurebased method to extract the weld seam profile(WSP)from the strong arc background using clustering ***,a binary image is obtained through the preprocessing ***,all data points with a gray value 255 are clustered with the nearest neighborhood clustering ***,a strategy is developed to discern one cluster belonging to the WSP from the appointed candidate clusters in each loop,and a scheme is proposed to extract the entire WSP using visual *** with the previous methods the proposed method in this paper can extract more useful details of the WSP and has better stability in terms of removing the interference *** WSPE tests with butt joints and T-joints show the anti-interference ability of the proposed method,which contributes to smoothing the welding process and shows its practical value in robotic automated welding with thick steel plates.

关键词： Weld seam profile extraction Visual attention features Clustering Robotic welding

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Mechanical mechanism of overlying strata breaking and development of fractured zone during close-distance coal seam group mining

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International Journal of Mining Science and Technology 2020年第2期30卷 207-215页

作者： Jianguo Ning Jun Wang Yunliang Tan Qiang Xu College of Mining and Safety Engineering State Key Laboratory Breeding Base for Mining Disaster Prevention and ControlShandong University of Science and TechnologyQingdao 266590China

This study mainly investigates the mechanical mechanism of overlying strata breaking and the development of fractured zones during close-distance coal seam group mining in the Gaojialiang coal ***,a mechanical model for the second"activation"of broken overlying strata is established,and the related mechanical"activation"conditions are obtained.A recursive formula for calculating the separation distance of overlying strata is ***,a height determining method for predicting the height of fractured zones during close-distance coal seam group mining is proposed based on two values,namely,the separation distance and ultimate subsidence value of overlying *** method is applied to calculate the fractured zone heights in nos.20107 and 20307 mining *** calculated results are almost equal to the field observation ***,a modified formula for calculating the height of a waterflowing fractured zone is proposed.A comparison of the calculated and observed results shows that the errors are *** height determining method and modified formula not only build a theoretical foundation for water conservation mining at the Gaojialiang coal mine,but also provide a reference for estimating the height of water-flowing fractured zones in other coal mines with similar conditions.

关键词： Coal seam group Activation mechanism Separation Water-flowing fractured zone Modified formula

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Analysis and Numerical Simulation for Tunnelling Through Coal seam Assisted by Water Jet

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Computer Modeling in Engineering & Sciences 2016年第5期111卷 375-393页

作者： Dengfeng Su Yong Kang Xiaochuan Wang andan Zheng Dongyang Li Binyuan Yan Fuwen Yan State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China Hubei Key Laboratory of Waterjet Theory&New Technology Wuhan UniversityWuhan 430072China

Tunnel though coal seam is one of the most difficult tunnels since its risk of coal and gas outburst and the complex geological *** to the directional cutting of water jet and the characteristic of the coal seam and rock mass,this paper presents a new method of tunnelling though coal seam assisted by water jet slotting,which can be divided into improving permeability of coal seam and directional cracking in the rock *** mechanism of improving permeability of coal seam was stated,and the crack criterion of rock during blasting was established based on fracture ***,the evolution law of pressure wave and the crack propagation were simulated by FEM software ANSYS/LS-DYNA,the results show that the shape of the crush zone formed by stress wave is different between the normal borehole blasting and the slotted borehole blasting,and the tension is the main factor which let crack *** is more,for normal borehole blasting,the tension concentration occurred along the direction of 45 degrees and let crack expand,while for slotted borehole blasting the tension concentration occurred along the direction of 0 degrees and 90 degrees,and the maximum tension along the direction of 0 degrees is larger than the maximum tension along the direction of 90 degrees,and the main crack expand along the direction of 0 degrees,which prove that the existence of the slot play a good role of orientation for directional cracking.

关键词： Tunnel though coal seam Directional cracking Water jet slotting ANSYS/LS-DYNA

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Evolution of a mining induced fracture network in the overburden strata of an inclined coal seam

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International Journal of Mining Science and Technology 2012年第6期22卷 775-779页

作者： Wei Xiujun Gao Mingzhong Lv Youchang Shi Xiangchao Gao Hailian Zhou Hongwei Institue of Energy & Chemical Industry China Pingmei Shenma Group School of Hydraulic and Hydropower Engineering Sichuan University State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology

The geological conditions of the Pingdingshan coal mining group were used to construct a physical model used to study the distribution and evolution of mining induced cracks in the overburden *** graphics technology and fractal theory are introduced to characterize the distribution and growth of the mining induced fractures in the overburden strata of an inclined coal seam.A relationship between fractal dimension of the fracture network and the pressure in the overburden strata is *** induced fractures spread dynamically to the mining face and up into the roof as the length of advance ***,the fractal dimension of the fracture network increases with increased mining length,in general,but decreases during a period from overburden strata separation until the main roof *** is a1so shown that overburden strata pressure plays an important role in the evolution of mining induced fractures and that the fractal dimension of the fractures increases with the pressure of the overburden.

关键词： Inclined coal seam Fracture network Evolution Fractal dimension

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Numerical simulation and damage analysis of fissure field evolution law in a single coal seam mining

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International Journal of Mining Science and Technology 2012年第6期22卷 853-856页

作者： Feng Gao Xingguang Liu Chaofeng Ge Hongmei Cheng State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology School of Mechanics and Civil Engineering China University of Mining & Technology

Based on the different deformation and failure laws of coal and rock materials under tensile or compressive loads,the damage variable was defined to divide three phases from the damage and rupture point of view in order to reveal the fissured field evolution characteristics and spatial distribution of coal and rock in the single coal seam mining with low permeability and rich *** to the corresponding damage constitutive equations,the secondary development of the finite element program was *** fissures field evolution law of a coal mine with single coal seam mining was calculated and analyzed by this new program and the distribution areas and failure degree of the surrounding coal and rock structures with damage,fissure or rupture are given on the condition of *** paper provides a scientific basis for quantitative research and evaluation of the safe simultaneous production of coal and gas.

关键词： Single coal seam Damage Fissure Rupture Finite element

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