动载诱发近直立煤层水平分段开采冲击矿压的数值模拟研究  

Numerical simulation of rock burst of horizontal sectional mining of near-vertical coal seam under dynamic load

作　　者：李安宁 窦林名 王正义 曹晋荣 王崧玮 山长昊 LI An-ning;DOU Lin-ming;WANG Zheng-yi;CAO Jin-rong;WANG Song-wei;SHAN Chang-hao(Key Laboratory of Deep Coal Resource Mining of Ministry of Education,School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Shaanxi Coal Group Yubei Coal Co.,Ltd.,Yulin 719300,China)

机构地区：[1]中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室,江苏徐州221116 [2]陕西陕煤榆北煤业有限公司,陕西榆林719300

出　　处：《煤炭工程》2018年第9期83-87,共5页Coal Engineering

基　　金：国家重点研发计划专项资助(2016YFC0801403);江苏省重点研发计划资助(BE2015040);国家自然科学基金重点项目资助(51634001);江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)

摘　　要：针对近直立煤层特殊的赋存条件和水平分段开采的技术条件,建立顶底板夹持梁的力学模型,对诱发冲击的动静载力源进行简要分析。基于分析结果采用FLAC3D数值模拟方法分析了动载作用下近直立特厚煤层工作面煤体应力、位移等的动态响应特征,进而揭示了冲击显现机制。结果表明:在顶底板围岩破裂产生震动效应传播而来的冲击载荷扰动下,近直立煤层工作面底煤水平应力先升高后瞬间大幅降低,垂直位移也突然增大,煤体自身平衡状态被打破,易诱发冲击显现。基于近直立煤层冲击诱发机制,提出了煤体卸压爆破和顶、底板预裂爆破等解危措施并在现场实施,解危效果显著。Based on the special conditions of the near-vertical coal seam and the technical conditions of horizontal sectional mining,a mechanical model of the clamping beam is established,a brief analysis is made on the dynamic and static capacity of the induced impact. Based on the analysis results,the dynamic response characteristics of coal stress,displacement and other dynamic characteristics of the working face of near-vertical strata under dynamic load are studied using FLAC3 D,the mechanism of rock-burst is revealed. Results show that the mining field is affected by the vibration of the external rock mass under static load stability,the mining face below horizontal stress instantaneous sharply lowers after rising first,vertical displacement increases suddenly,its balance is broken,leading to rock burst. The research results show the impact mechanism and the prevention and control of the horizontal sectional mining of near-vertical coal seam.

关 键 词：近直立特厚煤层 水平分段开采 数值模拟 冲击矿压 

分 类 号：TD324[矿业工程—矿井建设]