锚索支护密度影响下煤矿巷道稳定性分析  

Stability Analysis of Coal Mine Roadway under Influence of Anchor Cable Support Density

作　　者：方运买 李进宝 FANG Yunmai;LI Jinbao(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Yindonggou Coal Mine,Ningxia Wangwa Coal Industry Co.,Ltd.,Guyuan 756000,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]宁夏王洼煤业有限公司银洞沟煤矿,宁夏固原756000

出　　处：《煤炭技术》2024年第5期18-23,共6页Coal Technology

基　　金：安徽省高等学校自然科学研究重点项目(2022AH050807);矿山建设工程安徽省高校重点实验室开放课题资助项目(GXZDSYS2022107);安徽理工大学校青年基金资助项目(QNZD2021-03);安徽理工大学高层次引进人才科研启动基金项目(2021yjrc16);安徽省大学生创新创业训练计划项目(202310361111)。

摘　　要：根据银洞沟矿11采区行人下山的实际工程概况,建立了考虑围岩峰后力学参数随塑性剪切应变呈多段线性函数演化的数值模型。结合顶底板竖向位移、锚索轴力以及塑性区的分布演化情况,研究了锚索支护密度对巷道稳定性的影响。结果如下:(1)巷道顶板位移随计算时步的增加呈先减速下沉而后趋于平稳的变化趋势,底板位移随计算时步的增加呈先减速上升而后趋于平稳的变化趋势。(2)模型竖向位移场显示,随支护密度的增加,模型顶板下沉及底板上升最大位移均呈逐渐降低趋势。模型竖向应力场显示,随支护密度的增加,模型最大竖向应力呈增加趋势。围岩应力降低区与顶板围岩松动变形区范围基本一致,也随支护密度的增加而减小。(3)随着支护密度的增加,塑性剪切应变大于0.2、0.1及0.05的单元数均呈降低趋势。Based on the actual engineering situation of pedestrian downhill roadway in the 11th mining area of Yindonggou mine,this study establishes a numerical model that incorporates the post-peak evolution of mechanical parameters of the surrounding rockmass using a multi-segment linear function that accounts for plastic shear strain.Based on the vertical displacement of the roof and floor,the axial force of the anchor cable,and the distribution and evolution of the plastic zone,the influence of anchor cable support density on the stability of the roadway was studied.The results are as follows:(1)The roof displacement exhibits a trend of initially slowing down and stabilizing with increasing calculation time steps.Similarly,the floor displacement also shows a pattern of initially decelerating and then stabilizing with increasing calculation time steps.(2)The vertical displacement field demonstrates that as support density increases,the maximum displacement of the top plate sinking and bottom plate rising gradually decreases.The vertical stress field reveals that the maximum vertical stress in the model increases with higher support density.The extent of the stress reduction zone in the surrounding rock aligns closely with the loose deformation zone in the roof's surrounding rock,decreasing as support density increases.(3)As support density increases,the number of units exhibiting plastic shear strains greater than 0.2,0.1,and 0.05 shows a decreasing trend.

关 键 词：锚索 支护密度 行人下山 围岩稳定性 顶、底板位移 塑性区 

分 类 号：TD322[矿业工程—矿井建设] TD353