大柳煤矿深部软岩巷道支护技术数值模拟研究

Numerical simulation study on support technology of soft rock roadway in Daliu Coal Mine

针对西部地区软岩巷道变形量大、底鼓严重的问题,以甘肃华亭煤业大柳煤矿1406工作面回风巷道为工程背景,基于ABAQUS数值模拟技术,对采用未支护、锚杆锚索支护、锚杆锚索支护+底部注浆、锚杆锚索支护+三帮注浆4种支护方案下巷道所处区域应力位移变化情况进行了分析研究。研究结果表明,与未支护巷道相比,架设帮顶锚杆锚索对巷道变形的抑制效果较强,Mises应力相应得到提高,锚杆锚索+注浆支护后巷道变形控制效果更加显著,围岩强度得到明显增强。通过不同支护方案数值计算结果的对比分析发现,控制帮部位移在一定程度上可以减少底鼓的上升量,帮部强化对底鼓位移可以起到很好的抑制作用。

Aiming at the problems of large deformation and serious floor heave of soft rock roadway in Western China,taking the return air way of 1406 working face in Gansu Huating Coal Industry Daliu Coal Mine as the engineering background,based on ABAQUS numerical simulation technology,the stress and displacement changes of the roadway under four different support schemes were analyzed,which included nonsupport,anchor bolt anchor cable support,anchor bolt anchor cable support combined with bottom grouting,anchor bolt anchor cable support combined with grouting in three sides of roadway.The research showed that compared with the unsupported roadway,the roof bolt and anchor cable support had a strong inhibitory effect on the roadway deformation,the Mises stress was correspondingly improved;the roadway deformation control effect was more significant after bolt and anchor cable support combined with grouting,and the strength of surrounding rock was significantly enhanced.Through the comparative analysis of the numerical calculation results of different support schemes,it was found that controlling the displacement of two sides of roadway could reduce the rise of floor heave to a certain extent,and strengthening two sides of roadway could restrain the displacement of floor heave.