特厚煤层顶煤渐进破坏的块体-颗粒耦合模拟研究  

Study on block-particle coupling approach for modeling progressive failure of top coal in extra thick coal seams

作　　者：张文辉 李东印[1] 王伸[1,2] 李化敏[1] 朱时廷 孙凯旋 张伟宇 ZHANG Wenhui;LI Dongyin;WANG Shen;LI Huamin;ZHU Shiting;SUN Kaixuan;ZHANG Weiyu(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Postdoctoral Station of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Tongmei Guodian Tongxin Coal Mine Co.,Ltd.,Datong Coal Mining Group,Datong 037001,Shanxi,China;Zhaozhuang Coal Mine Jinneng Holding Group,Jincheng 048000,Shanxi,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]河南理工大学安全科学与工程博士后科研流动站,河南焦作454000 [3]大同煤矿集团同煤国电同忻煤矿有限公司,山西大同037001 [4]晋能控股煤业集团赵庄煤业,山西晋城048000

出　　处：《河南理工大学学报（自然科学版）》2022年第6期24-35,共12页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家重点研发计划项目(2018YFC0604502);中国博士后科学基金资助项目(2020M672227);河南省自然科学基金资助项目(202300410175)。

摘　　要：为研究特厚煤层大采高综放开采过程中顶煤随开采进程的渐进破坏行为,探索FLAC3D块体和PFC3D颗粒动态耦合的三维数值模拟方法,考虑多台液压支架协同作用并采用Fish语言编写移架和放煤口控制算法,基于离散裂隙网络模型开发顶煤损伤裂隙的监测程序,实现顶煤裂隙发育过程可视化,在耗费较短计算时间和占用较小运行内存条件下可较为准确实现顶煤压裂、破碎直到散体放出全过程的工程尺度三维数值模拟。结果表明:顶煤裂隙在控顶区急剧发育,其中下部顶煤裂隙发育速度较快,然后逐步向上发展,这使得下部顶煤裂隙逐步贯通直至破碎为散体放出,上部顶煤主要以块体形式逐步破碎;破碎顶煤运移为垂直和水平方向的三维矢量合成运动,液压支架后方采空区内的条带状散体顶煤垂直位移集中区是导致遗煤出现的主要原因;力链体系演化可反映顶煤破碎机制,强力链束和拉力链的周期性作用使顶煤发生周期性破坏。该研究方法对于实现三维自动化多支架复杂放煤方式模拟、揭示顶煤破坏运移机理、指导放煤支架选型具有重要意义。In order to study the progressive failure behavior of top coal along with the mining process in the process of fully mechanized top coal caving with large mining height in extra thick coal seam,a 3D numerical simulation method of dynamic coupling of FLAC3D block and PFC3D particles was realized.Considering the collaborative effect of multiple hydraulic supports,the control algorithm of moving support and caving port was compiled by using Fish language,and the monitoring program of top coal damage fracture was developed based on discrete fracture network model realize the visualization of top coal fracture development process.The engineering scale three-dimensional numerical simulation of the whole process of top coal fracturing,crushing and loose body release could be zccurately realized with less calculation time and running memory.The results showed that:During the initial mining period,the top coal fractures developed rapidly in the roof control area,and their spatial distribution patterns changed periodically with the working face progress;Affected by the fracture development degree,the upper top coal mainly slided in the form of block,while the lower top coal fracture gradually penetrated until broken into loose body.The movement of broken top coal was a combination of vertical and horizontal three-dimensional vector motion.The vertical displacement concentration area of strip loose top coal in goaf behind hydraulic support was the fundamental reason for the occurrence of residual coal.The evolution of the force chain was the fundamental reason of the top coal failure.The method proposed in this study was of great significance to realize 3D automatic multi support complex caving mode simulation,to reveal the mechanism of top coal failure and migration,and to guide the selection of caving support.

关 键 词：特厚煤层 大采高综放开采 耦合数值模拟 动态裂隙监测 顶煤渐进破坏 

分 类 号：TD821[矿业工程—煤矿开采]