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Monitoring, Warning, and control of Rockburst in Deep Metal Mines

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Engineering 2017年第4期3卷 538-545页

作者： Xia-Ting Feng Jianpo Liu Bingrui Chen Yaxun Xiao Guangliang Feng Fengpeng Zhang key laboratory of ministry of education on Safe mining of Deep Metal Mines Northeastern University Shenyang 110819 China State key laboratory of Ceomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China

This paper reviews the recent achievements made by our team in the mitigation of rockburst risk. It includes the development of neural network modeling on rockburst risk assessment for deep gold mines in South Af- rica, an intelligent microseismicity monitoring system and sensors, an understanding of the rockburst evolution process using laboratory and in situ tests and monitoring, the establishment of a quantitative warning method for the location and intensities of different types of rockburst, and the development of measures for the dynamic control of rockburst. The mitigation of rockburst at the Hongtoushan copper mine is presented as an illustrative example.

关键词： Deep metal mining Rockburst Monitoring Warning Mitigation

A comparative study of dust control practices in Chinese and Australian longwall coal mines

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International Journal of mining Science and Technology 2016年第2期26卷 199-208页

作者： Ji Yinlin Ren Ting Wynne Peter Wan Zhijun Ma Zhaoyang Wang Zhimin School of Mines Key Laboratory of Deep Coal Resource Mining Ministry of Education of China China University of Mining and Technology Xuzhou 221116 China School of Civil Mining and Environmental Engineering University of Wollongong Wollongong NSW 2522 Australia mining Consultant (Underground Coal) Wollongong NSW 2522 Australia

Mine dust is one of the main hazards in underground longwall mines *** order to solve the mine dust problem,a significant number of studies have been carried out regarding longwall mine dust control,both in china and *** paper presents a comparative study of dust control practices in Chinese and Australian longwall mines,with particular references to statutory limits,dust monitoring methods and dust management practices,followed by a brief discussion on the research status of longwall mine dust control in both *** study shows that water infusion,face ventilation controls,water sprays,and deep and wet cutting in longwall shearer operations are commonly practiced in almost all underground longwall mines and that both Chinese and Australian longwall mine dust control practices have their own advantages and *** is concluded that there is a need for further development and innovative design of more effective dust mitigation products or systems despite the development of various dust control *** on the examinations and discussions,the authors have made some recommendations for further research and development in dust control in longwall *** is hoped that this comparative study will provide beneficial guidance for scholars and engineers who are engaging in longwall mine dust control research and practice.

关键词： Dust control Longwall coal mine Dust monitoring Ventilation Water spray Foam technology for dust control(FTDC)

Flotation separation of spodumene and albite with activation of calcium ion hydrolysate components

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Rare Metals 2022年第11期41卷 3919-3931页

作者： Xian-Ping Luo Yong-Bing Zhang He-Peng Zhou Fan-Xin Xie Zhi-Zhao Yang Bo-Yuan Zhang Cai-Gui Luo Engineering Research Center for High-Efficiency Development and Application Technology of Tungsten Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou341000China Jiangxi Province key laboratory of mining and Metallurgy Environmental Pollution control Jiangxi University of Science and TechnologyGanzhou341000China

It is difficult to separate spodumene and albite by flotation with calcium ion as *** this study,microflotation experiment,solution chemistry calculation,density functional theory(DFT)calculation and X-ray photoelectron spectroscopy(XPS)analysis were conducted to investigate the effect mechanism of c alcium hydrolysate on the flotation separation of spodumene and *** show that the weak interaction intensity of Ca^(2+)with O atoms on the mineral surface makes it difficult to activate minerals *** O atom in the hydroxyl group of Ca(OH)^(+)and Ca(OH)_(2)can be strongly bonded with Al atom on the mineral surface,which greatly improves the adsorption *** the activation of Ca(OH)^(+),the adsorption forms of collectors on the surface of spodumene and albite are quite different,and the adsorption intensity on the surface of spodumene is higher,which is conducive to the flotation separation of spodumene and *** the action of Ca(OH)_(2),the adsorption of the collector on the albite surface is stronger than that of spodumene,which is not conducive to the flotation separation of the two *** adjusting the initial concentration of calcium ions and pulp pH,Ca(OH)^(+)is the main active component,which is the key to improve the separation effect of spodumene and albite.

关键词： Spodumene Albite Calcium ions Hydrolysate components Flotation Separation

Coupling control on pillar stress concentration and surface cracks in shallow multi-seam mining

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International Journal of mining Science and Technology 2021年第1期31卷 95-101页

作者： Qingxiang Huang Junwu Du Jie Chen Yanpeng He College of Energy Engineering Xi’an University of Science and TechnologyXi’an 710054China key laboratory of western Mine Exploitation and hazard Prevention Ministry of EducationXi’an 710054China College of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China

In order to ensure safe mining and reduce surface damage in shallow multi-seam mining,the failure characteristics of interburden strata with different coal pillars offset distances between pillars in the upper and lower seams,the distribution characteristics of stress concentration in coal pillars,and the development characteristics of stratum cracks and subsidence were investigated by physical and UDEC2D ***,the effect of different coal pillar offset distances on stress concentration of coal pillar and development of stratum cracks were *** on those results,a formula for safe mining and reducing surface damage was established,which provided a theoretical basis for safe and environmentally friendly mining in shallow *** to the results,the optimal coal pillar offset distance(the side to side horizontal distance of the upper and lower coal pillars)between the upper and lower coal seams was developed to reduce the stress concentration of coal pillars and surface *** results of this study have been applied in Ningtiaota coal mine and have achieved good results in safe and environmentally friendly mining.

关键词： Shallow multi-seam Coal pillar offset Stress concentration Surface cracks Strata control

Research on Reliability of Desorption Indexes of Drilling Cuttings(K_(1)andΔh_(2)):A Case-Based on Pingdingshan mining Region,china

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Energy Engineering 2021年第3期118卷 605-614页

作者： Jianguo Zhang Biao Hu Xiyuan Li Hongxing Zhou Zhixu Dai Yanlei Lu Deyang Wang State key laboratory of Coking Coal Exploitation and Comprehensive Utilization China Pingmei Shenma GroupPingdingshan467009China laboratory of Gas and Fire control for Coal Mines(china University of mining and Technology) Ministry of EducationXuzhou221116China Pingdingshan Tian’an Coal mining Co. Ltd.Pingdingshan467000China

To accurately predict the risk of coal and gas outburst and evaluate the reliability of desorption indexes of drilling cuttings(K_(1) andΔh_(2))in No.16 coal seam of Pingmei No.12 coal mine,two sets of coal samples were selected from the target coal seams for proximate analyses,methane adsorption/desorption tests,and desorption indexes of drilling cuttings *** results indicated that the desorption volume in the initial stage of desorption is large,and increases slowly in the later *** methane desorption volume of PMD1 and PMD2 coal samples accounts for 15.14%-18.09%and 15.72%-18.17%respectively in the first 1 min,and 43.92%-48.55%and 41.87%-52.25%respectively in the first 10 min in the 120 min desorption *** K_(1) andΔh_(2) present power function relationships with methane ***,the power function relationships also can be found between the initial desorption characteristics(Q1 and Q4-5)and the methane ***,the average relative error between the measured value and the calculated value of Q1 based on K_(1) is less than that of Q4-5 based onΔh_(2),which indicates that K_(1) is a more reliable index thanΔh_(2) to predict the risk of coal and gas outburst in the No.16 coal seam of Pingmei No.12 coal mine.

关键词： Coal and gas outburst methane desorption desorption indexes of drilling cuttings

Insights into the floatability between spodumene and albite from crystal chemistry standpoint

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International Journal of mining Science and Technology 2022年第6期32卷 1329-1339页

作者： Hepeng Zhou Fanxin Xie Yongbing Zhang Boyuan Zhang Siqi Yang Xianping Luo Engineering Research Center for High-efficiency Development and Application Technology of Tungsten Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou 341000China Jiangxi Province key laboratory of mining and Metallurgy Environmental Pollution control Jiangxi University of Science and TechnologyGanzhou 341000China

Spodumene is a silicate mineral rich in ***,the gangue mineral,albite has similar crystal chemical structure and composition to *** this work,the density functional theory(DFT)calculation was taken to research the floatability from the perspective of crystal *** contact angle test and reagent adsorption test were used to support the simulation *** addition,the weighted total density of broken bonds is proposed for the first time to judge the generation probability of cleavage *** DFT calculation results display that the Na and Al sites on the albite surface are the adsorption sites of water *** the water molecules only bond with Al atom on the surface of spodumene and each Al site can adsorb only one water ***,the wetting effect of water molecules on the albite surface is stronger than that of *** is consistent with the result of contact *** sodium oleate system,the oleic acid anion is adsorbed on the spodumene surface in form of a multicomponent ring while the albite is a single ***,oleic acid anion can be strongly adsorbed on the surface of spodumene and albite under *** adsorption strength of spodumene is higher than that of ***,on hydrated surface,the adsorption strength of oleic acid anion on mineral surface is greatly reduced due to the interaction between water molecules and metal site on mineral ***,spodumene and albite are hard to float without external activated ions in sodium oleate system.

关键词： Spodumene Albite Floatability Crystal chemistry DFT calculation

A critical review on the developments of rock support systems in high stress ground conditions

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International Journal of mining Science and Technology 2020年第5期30卷 555-572页

作者： Masoud Ghorbani Korosh Shahriar Mostafa Sharifzadeh Reza Masoudi Department of mining and Metallurgical Engineering Amirkabir University of TechnologyTehranIran key laboratory of ministry of education on Safe mining of Deep Metal Mines Northeastern UniversityShenyangLiaoning 110819China Department of mining and Metallurgical Engineering Curtin UniversityKalgoorlieWA 6430Australia

Extreme ground behaviour in high-stress rock masses such as rockburst prone and squeezing ground conditions are encountered in a range of underground projects both in civil and mining *** occurrence of such ground behaviour types are difficult to predict and special design and construction measures must be taken to control *** the most appropriate support system in such grounds is one of the major challenges for ground control engineers because there are many contributing factors to be considered,such as the rock mass parameters,the stress condition,the type and performance of the support systems,the condition of major geological structures and the size and geometry of the underground *** main characteristics and support requirements of rockburst-prone and squeezing ground conditions are herein critically reviewed and characteristics of support functions are *** types of energy-absorbing rockbolts and other support elements applicable for ground support in burst-prone and squeezing grounds are *** differences in the choice and economics of ground support strategies in high-stress ground conditions between civil tunnels and mining excavations are *** support benchmarking data and mitigation measures for mines and civil tunnels in burst-prone,squeezing and heavily swelling grounds conditions are briefly presented by some examples in practice.

关键词： High in-situ stress Rockburst Squeezing Swelling Energy-absorbing rockbolts Yielding supports

Productivity of coalbed methane wells in southern of Qinshui Basin

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mining Science and Technology 2010年第5期20卷 765-769,777页

作者： ZOU Mingjun WEI Chongtao PAN Haiyang SESAY K Santigie CAO Jia School of Resources and Geoscience China University of Mining & Technology Xuzhou 221116 China key laboratory of CBM Resource and Reservoir-Generating Process Ministry of Education Xuzhou 221008 China

Based on regional CBM geological characteristics and drainage data of three typical Coalbed Methane(CBM) wells in the southern Qinshui Basin,history matching,productivity prediction and factor analysis of gas production control are conducted by using COMET3 reservoir modeling *** results show that in the next 20 years,the cumulative and average daily gas production of the QN01 well are expected to be 800×104 m3 and 1141.1 m3/d,for the QN02 well 878×104 m3 and 1202.7 m3/d and 97.5×104 m3 and 133.55 m3/d for the QN03 *** content and reservoir pressure are the key factors controlling gas production in the area;coal thickness,permeability and porosity are less important;the Langmuir volume,Langmuir pressure and adsorption time have relatively small *** the process of CBM recovery,the material source and driving force are the key features affecting gas productivity,while the permeation process is relatively important and the desorption process has some impact on gas recovery.

关键词： reservoir modeling history matching productivity prediction COMET3

Pore structure characterization and seepage analysis of ionic rare earth orebodies based on computed tomography images

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International Journal of mining Science and Technology 2022年第2期32卷 411-421页

作者： Xianping Luo Yongbing Zhang Hepeng Zhou Kunzhong He Boyuan Zhang Dongming Zhang Weijing Xiao National Innovation Center for Rare Earth Functional Material Jiangxi University of Science and TechnologyGanzhou 341000China key laboratory of Ionic Rare Earth Resources Development and Application Ministry of EducationJiangxi University of Science and TechnologyGanzhou 341000China Jiangxi key laboratory of mining&Metallurgy Environmental Pollution control Jiangxi University of Science and TechnologyGanzhou 341000China State key laboratory of Coal Mine Disaster Dynamics and control Chongqing UniversityChongqing 400044China

Pore network structure of ore body is a diffusion channel of leaching agent solution that exerts a significant influence on *** ore body structure,pore distribution,pore and throat size,and pore network characteristics of topsoil,weathered,and semiweathered layers of ionic rare earth ore in southern Jiangxi Province were explored in this *** effect of leaching operation on the pore structure was investigated,and main factors affecting the seepage were *** showed that the semiweathered layer presents a dense structure and a small number of unconnected *** of topsoil and weathered layers are mainly long and narrow column openings with some planar *** pore distribution and large size span were *** with the weathered layer,the topsoil layer demonstrates larger voids,smaller average pore volume and equivalent radius,and fewer coordination throats;however,the average equivalent radius of the throat in the topsoil layer is larger and largescale channels exist through ore body ***,permeability of the topsoil layer is significantly higher than that of the weathered *** clay minerals migrate easily and the occurrence of silting in the small porosity blocks the throat and significantly decreases the permeability of the ore body in the leaching *** equivalent radius of the throat is the key to the *** the migration of fine particles is an effective measure to protect the throat and shorten the leaching period.

关键词： Ionic rare earth ore CT scanning 3D visualization Pore characteristics Permeability