榆神矿区双煤层开采错距方案优化数值模拟  

Optimization numerical simulation of staggered distance scheme for double coal seam mining in Yushen Mining Area

作　　者：孙学阳[1,2] 卢明皎 李成 苗霖田[3] SUN Xueyang;LU Mingjiao;LI Cheng;MIAO Lintian(School of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Mine Geological Hazards Mechanism and Control,Xi’an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Xi’an 710054,China)

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054 [2]矿山地质灾害成灾机理与防控重点实验室,陕西西安710054 [3]煤炭资源勘查与综合利用重点实验室,陕西西安710054

出　　处：《煤矿安全》2021年第2期182-187,193,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(41272388)。

摘　　要：为研究双煤层开采错距最优方案和对覆岩结构关键层的影响,以榆神井田地质条件为工程背景,采用FLAC3D数值模拟手段,从开采错距5种模拟方案中比选出最优方案,并基于Mohr-Coulomb强度准则与数值模拟结果,讨论了不同开采错距对覆岩结构关键层的影响。研究表明:双煤层错距开采工作面覆岩拉应力呈现“谷-峰-谷”形分布,错距煤柱影响范围内最大主应力呈“平峰”状分布,下沉值呈现“尖峰”状分布;最优错距为40 m,最不利错距为0 m;通过对双煤层开采错距方案优化,可以有效保护覆岩结构关键层完整性,减小覆岩破坏范围。In order to study the optimal scheme of staggered distance mining in double coal seam and its influence on the key strata of overburden structure,take the geological conditions of Yushen Mine Area as the background,the optimal scheme was selected from the five simulation schemes of staggered distance mining by the FLAC3D numerical simulation method.Based on the Mohr-Coulomb strength criterion and numerical simulation results,the influence of different staggered distance on the key strata of overburden structure was discussed.The results show that the tensile stress of overburden strata on the working face shows a“valley-peak-valley”distribution with double coal seam staggered distance mining,the maximum principal stress in the influence range of staggered distance coal pillar shows a“flat peak”distribution,and the subsidence value shows a“peak”distribution.The optimal staggered distance is 40 m and the most unfavorable staggered distance is 0 m.Through the optimization of the staggered distance scheme of double coal seam mining,the integrity of the key strata of overburden structure can be effectively protected and the failure range of overburden structure can be reduced.

关 键 词：双煤层开采 数值模拟 最优错距 应力集中 覆岩结构关键层 

分 类 号：TD323[矿业工程—矿井建设]