厚顶煤强动压巷道围岩注浆加固技术研究

Study on Surrounding Rock Grouting Reinforcement Technology of Strong Dynamic Pressure Roadway with Thick Top Coal

为解决孙家沟煤矿厚顶煤巷道由于受相邻综放工作面回采动压影响而出现巷道大面积变形严重、顶板及两帮支护结构部分失效,以及顶板破碎、离层、下沉且伴有大面积底鼓的难题,以13311进风巷为工程背景,采用围岩表面位移监测与钻孔窥视的方法探究巷道围岩运移规律及顶板岩层结构,并基于此提出使用高分子注浆加固材料对其顶板和煤壁帮进行注浆综合加固。研究结果表明:注浆后13311进风巷顶板变形得到了有效控制;破碎的巷道顶板重新形成一个整体;煤岩体的强度得到提高,巷道的承载结构兼具了一定的抗剪切能力。

To solve these problems of serious and extensive roadway deformation, support structure partial failure in roof and both sides, roof fracture, separation, subsidence as well as extensive floor heave caused by dynamic mining pressure of adjacent mining face in roadway with thick top coal of Sunjiagou coal mine, based on 13311 intake airflow roadway, surface displacement monitoring of surrounding rock and drilling imaging were adopted to explore roadway surrounding rock movement rule along with structure of roof strata. Based on this, polymer materials were used to grout and reinforce in roof and coal wall. The results showed that roof deformation of 13311 intake airflow roadway was effectively controlled by grouting, broken roof formed a whole again, strength of coal and rock mass were increased, meanwhile roadway bearing structure had certain anti-shear ability.