损伤变量在煤层底板开采破坏深度计算中的应用

发布时间：2018-01-24 04:43

本文关键词： 采动损伤 FLAC~(D) 并行电法煤层底板破坏深度损伤变量　出处：《矿业安全与环保》2017年05期 　论文类型：期刊论文

【摘要】：针对煤层底板破坏深度的计算很少考虑实际存在的采动损伤的现状,以某矿A组煤开采为背景,提出一种基于数值模拟与理论计算的底板岩层损伤变量,进而确定底板破坏深度的方法。通过在该矿工作面巷道特定位置施工井下钻孔,采用并行电法探测技术验证该方法的有效性。结果表明:底板应力在推进至断层附近时达到峰值19.70 MPa,底板岩层等效损伤变量D'=0.79;基于损伤变量计算得出的底板岩层的最大破坏深度为20.27 m,对比井下实测结果,其准确率达到93.32%。研究结果为快速准确地确定底板采动破坏深度提供了一个新思路。
[Abstract]:In view of the fact that the actual mining damage is seldom taken into account in the calculation of the failure depth of coal seam floor, a kind of damage variable of floor strata based on numerical simulation and theoretical calculation is put forward in the background of A group coal mining in a certain mine. Furthermore, the method of determining the depth of floor failure is used to construct underground borehole in the specific position of roadway in the coal face. The effectiveness of the method is verified by using the parallel electrical detection technique. The results show that the stress of the bottom plate reaches a peak value of 19.70 MPa when it is pushed to the vicinity of the fault, and the equivalent damage variable of the floor rock is DJ0.79; The maximum damage depth of the bottom rock is 20.27 m, which is compared with the measured results. The accuracy of the method is 93.32. The research results provide a new idea for determining the mining failure depth of the bottom plate quickly and accurately.
【作者单位】：安徽理工大学地球与环境学院;
【基金】：安徽省高等学校省级自然科学研究重大项目(KJ2014ZD11) 深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1313) 国家自然科学基金项目(41472235)
【分类号】：TD745
【正文快照】： 网络出版地址:http://kns.cnki.net/kcms/detail/50.1062.TD.20171009.1642.032.html随着我国浅部煤炭资源的逐渐枯竭,煤炭资源的开采深度不断增加,底板突水问题不断增多[1]。许多学者对煤层底板突水进行了大量的研究,突水系数(Ts)[2-3]、Ts—q、脆弱性指数法[4]等指标和方法

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