Selected elements of rock burst state assessment in case studies from the Silesian hard coal mines

Exploitation of coal seams in the Upper Silesian Coal Basin is conducted in complex and difficult conditions. These difficulties are connected with the occurrence of many natural mining hazards and limitations resulting from the existing in this area surface infrastructure. One of the most important problems of Polish mining is the rock burst hazard and reliable evaluation of its condition. During long-years' mining practice in Poland a comprehensive system of evaluation and control of this hazard was de-veloped. In the paper the main aspects of rock burst hazard state evaluation will be presented, comprising: 1) rock mass inclination for rock bursts, I.e., rock strength properties investigation, comprehensive parametric evaluation of rock mass inclination for rock bursts, prognosis of seismic events induced by mining operations, methods of computer-aided modelling of stress and rock mass deformation parameters distribution, strategic rock mass classification under rock burst degrees; 2) immediate seismic and rock burst hazard state evaluation, I.e., low diameter test drilling method, seismologic and seismoacoustic method, comprehensive method of rock burst hazard state evaluation, non-standard methods of evaluation; 3) legal aspects of rock burst hazard state evaluation. Selected elements of the hazard state evaluation system are illustrated with specific practical examples of their applica-tion.     

介于岩浆岩型与剪切带型之间的脉状钨锡矿床--广西珊瑚钨锡矿床新认识

通过对广西珊瑚钨锡矿床矿脉的结构与构式研究,认为该矿床属“岩浆岩型”与“剪切带型”脉状矿床的过渡类型。早期,矿床受逆－平移脆－韧性剪切带控制,其初始破裂体系在平面上呈左行雁列,在横剖面上呈正花状构造;晚期,由于岩浆矿液的大量喷涌,早期破裂体系中的流体压力剧增,导致矿脉扩展由构造致裂转变为流体致裂,矿脉呈现树型分叉。矿脉分维值为1.39,其值介于流体型破裂与构造型破裂之间。根据珊瑚钨锡脉状矿床的新构造模型,认为该矿床F1断层东侧深部具有很大的找矿潜力。     

Analysis and application in controlling surrounding rock of support reinforced roadway in gob-side entry with fully mechanized mining

In order to optimize gob-side entry in fully-mechanized working face in moderate-thick-coal seams,we adopt a new attempt to pack roadside by pumping ordinary concrete,which is very important for the development of gob-side entry technology.The concrete has a long initial setting time and a low initial strength.So it is difficult to control the surrounding rock.In this paper,we analyze the effect of using roadside cable to reinforce supporting in gob-side entry surrounding rock controlling based on elastic-plastic and material mechanics knowledge.And then we propose a scheme that cable is used to reinforce roadside supporting and a single hydraulic prop is used as the temporary supporting in gob side.Using the numerical simulation software FLAC2D,we numerically simulated supporting scheme.Results of both the 2D modeling and the industrial test on No.3117 face in Jingang Mine prove that the scheme is feasible.The results show that the technology of protecting the roadway in gob-entry retained efficiently make up the deficiency of roadside packing with ordinary concrete,effectively control the roof strata and acquire a good result of retaining roadway.     

不确定性推理方法在金川二矿区西部岩体类型确定中的应用

采用围岩分类专家系统中的不确定性推理处理方法,以工程地质学家谷德振提出的岩体结构划分标准为基础,对金川二矿区岩（矿）体用模糊数学中择近原则的方法进行模糊综合判别。对于专家评判中涉及到的诸多模糊性因素,不确定性因素以及采用因素关系图来作定性描述;将被评定的岩（矿）体结构视为论域上的一个模糊子集;把推理过程抽象为多维论域上确定隶属度的过程,进而用连续隶属函数进行岩（矿）体结构的模糊推理;最后以隶属度的形式给出模糊识别结果,建立了各种结构类型岩组的岩体力学模型。     

元宝山北方红土崩解性灾害的防治对策

实验表明，元宝山红土含有伊－蒙混层矿物，孔隙－裂隙结构，超固结性，干时坚硬，遇水崩解的特征，是造成工程灾害的原因．采用改良红土性质或用覆盖法处理，可消除崩解特性，从而保证了工程建筑物的安全     

Study of electromagnetic characteristics of stress distribution and sudden changes in the mining of gob-surrounded coal face

The incidence of dynamic coal or rock disasters is closely related to the distribution of stress in the surrounding rock. Our experiments show that electromagnetic radiation (EMR) signals are related to the state of stress of a coal body. The higher the stress, the more intense the deformation and fractures of a coal body and the stronger the EMR signals. EMR signals reflect the degrees of concentrated stress of a coal body and danger of a rock burst. We selected EMR intensity as the test index of the No.237 gob-surrounded coal face in the Nanshan coal mine. We tested the EMR characteristics of the stress distribution on the strike, on the incline and in the interior of the coal body. The EMR rule of rock bursts, caused by sudden changes in stress, is analyzed. Our re-search shows that EMR technology can be not only used to test qualitatively the stress distribution of the surrounding rock, but also to predict a possible occurrence of rock burst. Based on this, effective distress measures are used to eliminate or at least weaken the incidence of rock bursts. We hope that safety in coalmines will be enhanced.     

基于C/S结构的面向中小型企业的ERP系统研究及开发

重点讨论了ERP(EnterpriseResourcePlanning)系统的内部集成和外部集成,并从信息集成的角度进行了ERP系统模型的分析和构建,在此模型基础上,进行了面向中小型制造企业的基于C/S(Client/Server)结构的ERP系统的实例开发,已将其应用于某中小型企业,并取得了较好的效果