基于主应力差影响的底板应力分布状态研究  

Study on Stress Distribution State of Floor Based on the Influence of Principal Stress Difference

作　　者：何富连[1,2] 郑铮 杨增强[3] 郭延定 朱恒忠 HE Fulian;ZHENG Zheng;YANG Zengqiang;GUO Yanding;ZHU Hengzhong(College of Resources&Safety Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Inter grown Energy and Resources,China University of Mining&Technology(Beijing),Beijing 100083,China;School of Architecture Engineering,Huaiyin.Institute of Technology,Huai,an 223003,China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室,北京100083 [3]淮阴工学院建筑工程学院,江苏淮安223003

出　　处：《煤矿安全》2019年第11期67-71,共5页Safety in Coal Mines

基　　金：国家自然科学基金资助项目（51574243）;中国矿业大学（北京）越琦杰出学者奖励计划资助项目（800015Z1138）;中央高校基本科研业务费专项资金资助项目（800015J6）

摘　　要：了研究上煤层中留设煤柱对底板岩层的应力传递规律影响,创新性地引入“主应力差值”作为岩层承压状态的动态指标,代替传统的垂直应力、水平应力和剪切应力的方法,摆脱了传统模型无法定量描述煤岩体变形破坏程度的研究现状,以传统模型研究为基础,得出3个应力的底板应力分布状态,而后进一步分析“主应力差”的表征特性和求解公式,最终解算模型得到底板主应力差传递形式呈“扇形扩散状”,底板约20 m内浅部岩层内应力曲线呈“双峰状”,且随着埋深增大,曲线逐渐向“单峰状”转变,在下层位煤层顶板位置主应力差基本呈现单峰,且煤柱底板中线位置破坏程度最大。In order to study the influence of coal pillar in the upper coal seam on the stress transfer law of the floor rock, the"principal stress difference"is introduced innovatively as a dynamic index for the strata bearing state. It takes the place of the traditional methods of vertical stress, horizontal stress and shear stress, and gets rid of the research status that traditional models cannot quantitatively describe the degree of deformation and failure of coal and rock mass. In this paper, based on the traditional model research, the stress distribution state of the three stresses is obtained. Then the characteristic and solution formula of"principal stress difference"are further analyzed. Finally, the solution model shows that the transfer form of the principal stress difference on the floor is"fan-shaped diffusion", and the stress curve in the shallow strata within 20 m of the floor is"double peak".With the increase of buried depth, the curve gradually changes to a"single peak shape", and the principal stress difference at the lower seam roof presents single peak, and the damage degree of the center line of the coal pillar floor is the largest.

关 键 词：近距离煤层 半平面理论 主应力差 扇形扩散状 岩体变形破坏 底板应力 

分 类 号：TD327.3[矿业工程—矿井建设]