工作面末采期间煤层大巷群围岩控制技术研究  

Research on Surrounding Rock Control Technology of Coal Seam Main Roadway Group during the Final Mining Period of the Working Face

作　　者：李常浩 LI Changhao(Yuwu Coal Industry Co.,Ltd.,Lu'an Chemical Group,Changzhi 046103,China)

机构地区：[1]潞安化工集团余吾煤业有限责任公司,山西长治046103

出　　处：《煤》2024年第4期20-23,28,共5页Coal

基　　金：国家自然科学基金资助项目(52104091);中国博士后科学基金第73批面上资助(2023M732969);天地科技开采设计事业部创新基金重点项(KJ-2021-KCZD-02)。

摘　　要：N2105工作面末采期间所形成的超前支承应力和采空区上方覆岩运移所形成的动载扰动均会对停采线前方的煤层大巷群造成影响,基于此工程采用UDEC^(3D)离散元软件模拟分析揭示了对顶板内厚硬关键层进行充分致裂后,煤柱体内所承载的垂直应力在“双峰值”位置处降幅分别为21.1%和16.0%.同时采用COMSOL Multiphysics数值仿真软件模拟确定了1号回风大巷围岩注浆加固的最佳的水灰质量比和压力值分别为1.5∶1和1.0 MPa.在1号回风大巷内实施工业性应用后的60 d内,围岩顶底板和两帮收敛率分别为3.3%和1.4%,煤层大巷围岩控制效果良好。The advanced support stress formed during the final mining period of N2105 working face and the dynamic load disturbance caused by the movement of overlying rock above the goaf will both affect the coal seam roadway group in front of the stop mining line.Based on this engineering background,UDEC^(3D) discrete element software simulation analysis reveals that after sufficient cracking of the thick and hard key layer in the roof,the vertical stress carried by the coal pillar decreases by 21.1%and 16.0%at the"double peak"position,respectively.At the same time,COMSOL Multiphysics numerical simulation software was used to determine the best Water-cement ratio and pressure value of grouting reinforcement of surrounding rock of No.1 return air main roadway were 1.5∶1 and 1.0 MPa respectively.After industrial application in the No.1 return air roadway on site,the convergence rates of the roof,floor,and two sides of the surrounding rock within 60 days were 3.3%and 1.4%,respectively.The control effect of the surrounding rock in the coal seam roadway was good.

关 键 词：末采 煤层大巷 数值模拟 定向致裂 注浆 矿压监测 

分 类 号：TD353[矿业工程—矿井建设]