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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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Identifcation of large-scale goaf instability in underground mine using particle swarm optimization and support vector machine

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International Journal of Mining Science and Technology 2013年第5期23卷 701-707页

作者： Zhou Jian Li Xibing Hani S.Mitri Wang Shiming Wei Wei School of Resources and Safety Engineering Central South University Hunan Key Lab of Resources Exploitation and Hazard Control for Deep Metal Mines Department of Mining and Materials Engineering McGill University

An approach which combines particle swarm optimization and support vector machine(PSO–SVM)is proposed to forecast large-scale goaf instability(LSGI).Firstly,influencing factors of goaf safety are analyzed,and following parameters were selected as evaluation indexes in the LSGI:uniaxial compressive strength(UCS)of rock,elastic modulus(E)of rock,rock quality designation(RQD),area ration of pillar(Sp),the ratio of width to height of the pillar(w/h),depth of ore body(H),volume of goaf(V),dip of ore body(a)and area of goaf(Sg).Then LSGI forecasting model by PSO-SVM was established according to the influencing *** performance of hybrid model(PSO+SVM=PSO–SVM)has been compared with the grid search method of support vector machine(GSM–SVM)*** actual data of 40 goafs are applied to research the forecasting ability of the proposed method,and two cases of underground mine are also validated by the proposed *** results indicated that the heuristic algorithm of PSO can speed up the SVM parameter optimization search,and the predictive ability of the PSO–SVM model with the RBF kernel function is acceptable and robust,which might hold a high potential to become a useful tool in goaf risky prediction research.

关键词： goaf Risk identifcation Underground mine Prediction Particle swarm optimization Support vector machine

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Study on numerical simulation of spontaneous combustion prevention mechanism by nitrogen injection in goaf

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Journal of Coal Science & Engineering(China) 2006年第1期12卷 73-78页

作者：李宗翔何保贾进章 College of Vocational Liaoning Technical University Fuxin 123000 China College of Resource and Environment Engineering Liaoning Technical University Fuxin 123000 China

Based on heterogeneous and porous medium seepage of air leakage-diffusion equation, as well as, gas and porous medium synthesis heat transferring equation, a spontaneous combustion non-steady numerical model of nitrogen injection goaf was established, which can be solved by upwind finite element numerical simulation method si- multaneously. Taking the working face for example; air leakage seepage, nitrogen flow and gas distribution can be described in visual display in nitrogen injection goaf and the oxygen （O2）, carbon monoxide （CO） concentration and temperature distribution, as well as, their change were described in theory during the coal left behind combustion in goaf, which above reveals the complex mechanics course （mechanism） of seepage, diffusion and oxidation heat releasing during coal spontaneous combustion and its restraining. During the calculation, the effect factors of gas springing out and working face advancing were considered fully, and the spontaneous combustion course under different amount of nitrogen injection was simulated. The conclusions were obtained that under nitrogen injection condition, the high spontaneous combustion temperature area lean to the inlet air, but the shape becomes narrower, with the amount of nitrogen rising, the spontaneous combustion period becomes longer till to it does not happen. Meanwhile the nitrogen injection accelerates gas springing out in goaf. The result that turns out in theory simulation fits to practical nitrogen injection.

关键词： goaf opening area nitrogen injection spontaneous combustion period

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Bayes discriminant analysis method to identify risky of complicated goaf in mines and its application

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Transactions of Nonferrous Metals Society of China 2012年第2期22卷 425-431页

作者：胡玉玺李夕兵中南大学资源与安全工程学院长沙410083 深部金属矿产开发与灾害控制湖南省重点试验室长沙410083

A Bayes discriminant analysis method to identify the risky of complicated goaf in mines was presented. Nine factors influencing the stability of goaf risky, including uniaxial compressive strength of rock, elastic modulus of rock, rock quality designation （RQD）, area ratio of pillar, ratio of width to height of pillar, depth of ore body, volume of goaf, dip of ore body and area of goal, were selected as discriminant indexes in the stability analysis of goal. The actual data of 40 goals were used as training samples to establish a discriminant analysis model to identify the stability of goaf. The results show that this discriminant analysis model has high precision and misdiscriminant ratio is 0.025 in re-substitution process. The instability identification of a metal mine was distinguished by using this model and the identification result is identical with that of practical situation.

关键词： goaf risky identification Bayes discriminant analysis metal mines

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Integration system research and development for three-dimensional laser scanning information visualization in goaf

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Transactions of Nonferrous Metals Society of China 2016年第7期26卷 1985-1994页

作者：罗周全黄俊杰罗贞焱汪伟秦亚光中南大学资源与安全工程学院长沙410083

An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.

关键词： goaf laser scanning visualization integration system 1 Introduction The goaf formed through underground mining of mineral resources is one of the main disaster sources threatening mine safety production . Effective implementation of goaf detection and accurate acquisition of its spatial characteristics including the three-dimensional morphology, the spatial position as well as the actual boundary and volume, are important basis to analyze, predict and control disasters caused by goaf. In recent years, three-dimensional laser scanning technology has been effectively applied in goaf detection . Large quantities of point cloud data that are acquired for goaf by means of the three-dimensional laser scanning system are processed relying on relevant engineering software to generate a three-dimensional model for goaf. Then, a general modeling analysis and processing instrument are introduced to perform subsequent three-dimensional analysis and calculation . Moreover, related development is also carried out in fields such as three-dimensional detection and visualization of hazardous goaf, detection and analysis of unstable failures in goaf, extraction boundary acquisition in stope, visualized computation of damage index, aided design for pillar recovery, and three-dimensional detection

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Mechanism and control of ground residual deformation over longwall goaf

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中国有色金属学会会刊：英文版 2005年第S1期15卷 76-79页

作者： GUO Guang-li~1, WEI Kuang-ling~2, MU Bin-shan~3, Gao Jing-xiang~1, HE Guo-qing~1 (1. China University of Mining and Technology, Xuzhou 221008, China 2. Chongqing University, Chongqing 400044, China 3. Qiwu Coal Mine, Jining 277606, China)

The deformation of rupture rock mass in goaf is the main reason for ground terrene residual deformation. Based on field measurement and similar material simulation, the rupture strata structure and its residual deformation characteristics in the longwall goaf and its overburden are pointed out. On the basis of these achievements, the authors propose the mechanism of strengthening rupture rock mass ground and the control measures of deformation resistant structure. Using the case of main coal building in Xinzhuangzi Coal Processing Plant, this paper introduces the influence of strengthening rupture rock mass and deformation resistant structure.

关键词： abandoned goaf residual deformation rupture rockmass deformation mechanism deformation control

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Three-dimensional numerical modeling of fullspace transient electromagnetic responses of water in goaf

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Applied Geophysics 2016年第3期13卷 539-552,581,582页

作者： Chang Jiang-Hao Yu Jing-Cun. Liu Zhi-Xin School of Resources and Geosciences China University of Mining and Technology Xuzhou 221116 China.

The full-space transient electromagnetic response of water-filled goaves in coal mines were numerically modeled. Traditional numerical modeling methods cannot be used to simulate the underground full-space transient electromagnetic field. We used multiple transmitting loops instead of the traditional single transmitting loop to load the transmitting loop into Cartesian grids. We improved the method for calculating the z-component of the magnetic field based on the characteristics of full space. Then, we established the full- space 3D geoelectrical model using geological data for coalmines. In addition, the transient electromagnetic responses of water-filled goaves of variable shape at different locations were simulated by using the finite-difference time-domain （FDTD） method. Moreover, we evaluated the apparent resistivity results. The numerical modeling results suggested that the resistivity differences between the coal seam and its roof and floor greatly affect the distribution of apparent resistivity, resulting in nearly circular contours with the roadway head at the center. The actual distribution of apparent resistivity for different geoelectrical models of water in goaves was consistent with the models. However, when the goal water was located in one side, a false low-resistivity anomaly would appear on the other side owing to the full-space effect but the response was much weaker. Finally, the modeling results were subsequently confirmed by drilling, suggesting that the proposed method was effective.

关键词： goaf water mine transient electromagnetic method fullspace finite-difference time-domain method

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Monitoring of coal-mine goaf based on 4D seismic technology

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Applied Geophysics 2020年第1期17卷 54-66,168页

作者： Zhang Xian-Xu Ma Jin-Feng Li Lin Xi’an Research Institute of China Coal Technology and Engineering Group Xi’an 710077China National&Local Joint Engineering Research Center of Carbon Capture and Storage Technology Department of GeologyNorthwest UniversityXi’an 710069China

The range of coal-mine underground goaf has continuously expanded over ***,fracture,and deformation zones have also changed,thereby inducing coal-mine water inrush and other environmental *** this study,4 D seismic monitoring technology that is effective in reservoir development was used to monitor abnormal changes in coal-mine underground goaf to explore the feasibility of the *** a coal mine in Hancheng,Shaanxi as an example,we used the aforementioned technology to dynamically monitor the abnormal changes in the *** on the 4 D seismic data obtained in the experiment and the abnormal change characteristics of the coal-mine goaf,the method of 4 D seismic data processing in reservoir was improved.A set of 4 D data processing flow for the goaf was established,and the anomalies in the surface elevation and overlying strata velocity caused by collapse were *** have made the following improvements to the method of 4 D seismic data processing in the reservoir:(1)the static correction problem caused by the changes of surface elevation and destruction of the low-velocity layer has been solved through fusion static correction to comb the low-frequency components of elevation statics with the high-frequency components of refraction statics;(2)the problem of overlying strata velocity changes in the goaf caused by collapse has been solved through the velocity consistency method;(3)the problem of reflection event pull-down in the disturbance area has been solved through space-varying moveout correction based on cross-correlation;and(4)amplitude anomalies in the coal seam caused by the goaf have been addressed using the correction method of space-varying *** show that the 4 D seismic data processing and interpretation method established in this study is reasonable and effective.

关键词： 4D seismic technology coal mining goaf difference map cross-equalization processing

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Application of high density resistivity method in accuracy of goaf detection

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Global Geology 2011年第2期14卷 110-114页

作者： LIU Huiming LI Guangjie DU Lizhi College of Construction Engineering Jilin University Changchun 130026 China

Based on the relationship between the diameter and buried depth of goal, the authors establish the forward modeling by Res2dmod and inverse the model by Res2dinv. Thus, three kinds of models are obtained ： the model of single resistivity anomalous body, model of double different distance resistivity anomalous body, and model of layered resistivity anomalous body. Using forward and inversion, the image of detection is simulated, and the reliability is proved by comparing with the engineering examples.

关键词： high density resistivity method inversion goaf

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Study on goaf Hazards of Non-Coal Mine in China

Study on Goaf Hazards of Non-Coal Mine in China

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2008（沈阳）国际安全科学与技术学术研讨会

作者： MA Haitao WANG Yunhai FU Shigen (China Academy of Safety Science & Technology Beijing 100029 China)

＜正＞At the end of 2006,about 91,998 non-coal mines were permitted to be in operation in ***,with the rapid increase of ore output,and the quick expanding of the underground open areas,the goal hazards have emerged to be a more and more serious *** paper has done a synthetic analysis of the dimensions,distribution,and disaster phases of the non-coal mine goal in China,and has conducted a comprehensive study of the classification method of the non-coal mine goaf and the types of the goaf *** finally,five technical problems and their research proposals are put forward,providing a possible way to deal with the hazards of non-coal mine goal for the Chinese safety administration department.

关键词： non-coal mine goaf geologic hazard mine safety

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