采动条件下煤层底板变形破坏特征研究  

Study on Deformation and Fracturing Characteristics of Seam Floor under Mining Influence

作　　者：高召宁[1,2] 孟祥瑞[1,2] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001 [2]安徽理工大学煤矿安全开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《矿业安全与环保》2010年第3期17-20,24,共5页Mining Safety & Environmental Protection

基　　金：高等学校博士学科点专项科研基金项目(200803610001);安徽省科技攻关计划重大科技专项项目(08010302064);安徽高校省级自然科学研究重点资助项目(KJ2009A66);淮南市科技计划项目

摘　　要：采用相似材料模拟试验方法,重点研究了煤层底板的应力和变形随工作面开采的变化规律,得出煤层底板应力与变形具有采动差异效应和这种采动差异效应是底板岩层破坏裂隙产生拉剪复合破坏的力学机制的结论;采用理论分析方法,对采动影响条件下煤层底板破坏程度进行了分析,得出煤层底板破坏深度与岩层内摩擦角φ、岩层单向抗压强度σc、最大应力集中系数n和开采深度H之间的关系,在此基础上,提出了降低底板岩层破坏的措施。研究结果可为煤矿的安全开采和矿井水防治提供科学依据。In this paper, the authors made an emphatical study on the variation law of the stress and deformation of the seam floor with the working face advance by using the similar material simulation method, and came to the conclusions that the stress and deformation of the seam floor had the differential effect under the mining influence and such differential effect was caused by both tension and shearing force which was produced by the fracturing fissures in the floor stratum. By using the theoretical analysis method, the authors also analyzed the fracturing degree of the seam floor under the mining influence, obtained the relationship of fracturing depth of the seam floor with the inner friction angle φ, the unidirectional compression strength σc of rock stratum, the maximum stress concentration coefficient n and the mining depth H, and put forward the measures for reducing the fracturing of floor stratum on this basis. This study result can provide a sicietific basis for the safe mining of coal and the prevention and control of mine water.

关 键 词：煤层底板 采动差异效应 拉剪复合破坏 破坏深度 

分 类 号：TD325[矿业工程—矿井建设]