近距离下煤层中空注浆锚索注浆前后周边剪应力作用机理  

Action mechanism of peripheral shear stress before and after grouting with hollow anchor cable in lower seam of contiguous seams

作　　者：吴晓宇 周豪 吴晓伟 WU Xiaoyu;ZHOU Hao;WU Xiaowei(College of Coal Engineering,Datong University,Datong 037009,China;Yongdingzhuang Coal Industry Co.,Ltd.,Jinneng Holding Coal Group,Datong 037000,China)

机构地区：[1]山西大同大学,山西大同037009 [2]晋能控股煤业集团永定庄煤业有限责任公司,山西大同037000

出　　处：《煤炭工程》2024年第4期112-118,共7页Coal Engineering

基　　金：山西省高等学校科技创新计划资助项目(2022L447);山西大同大学基础青年科研基金资助项目(2022Q17);山西省教育科学规划“十四五”规划课题资助项目(GH-220556)。

摘　　要：为解决近距离下煤层破碎巷道围岩难以控制的问题,基于理论分析和数值模拟研究中空注浆锚索注浆前后对破碎围岩的控制效果,即注浆前后中空注浆锚索与围岩的周边剪应力作用机理。结果表明:注浆前锚固段符合粘弹性本构模型,剪应力曲线呈现线性增加到非线性下降再到稳定的单峰值,注浆后巷道周围预应力场沿锚索形成一个渐变式的整体,使巷道围岩应力场重新分布,剪应力强度随之降低,应力曲线转变二次线性快速增加到非线性快速下降再到稳定的双峰值曲线,有效提高破碎围岩和软岩巷道的抗剪强度。Aiming at the difficulty in surrounding rock control of broken roadway in lower seam of contiguous seams,we studied the control effect of surrounding rock before and after grouting with hollow grouting anchor cable by the means of theoretical analysis and numerical simulation,and analyzed the mechanism of the surrounding shear stress between the hollow grouting anchor cable and the surrounding rock before and after grouting.The results show that,the anchorage section conforms to the viscoelastic constitutive model before grouting,and the shear stress variation shows a single-peak curve,which firstly rises linearly,then declines nonlinearly and finally stabilizes;after grouting,the pre-stress field around the roadway forms a gradient entirety along the anchor cable,which redistributes the stress field around the roadway and reduces the shear stress strength,the stress variation shows a double peak curve,which firstly rises to a high peak in a quadratic linear manner,then declines nonlinearly and tends to be stable,while it rises again to a lower peak and finally falls and stabilizes,which indicates the shear strength of broken surrounding rock and soft rock roadway is significantly improved.

关 键 词：中空注浆锚索 破碎围岩剪应力 作用机理 巷道支护 应力控制 

分 类 号：TD353[矿业工程—矿井建设]