古汉山矿综放面切顶沿空留巷采空区帮控制技术

基于煤矿采掘接替紧张、巷道围岩控制困难等难题，以古汉山矿1604工作面为研究背景，提出切顶卸压沿空留巷技术。对沿空留巷采空区帮控制原理及围岩运动特征进行了理论分析，形成了切顶卸压沿空留巷无煤柱开采技术采空区帮稳定性控制体系，并在现场进行了工业性试验。研究结果表明，采用高强预应力锚索补强顶板、单体柱π梁支撑顶板及可伸缩工字钢挡矸防护等联合支护体系可行；实体煤帮最大移近量为276 mm，采空区帮最大移近量为216 mm，顶板最大移近量为225 mm，底板最大鼓起量为164 mm，采空区帮挡矸防护体系变形不明显，留巷变形在合理范围内，留巷效果良好，可为类似条件下的切顶沿空留巷工程提供借鉴。

Gob Side Control Technology in Gob Side Entry of Fully Mechanized Top Coal Caving Face in Guhanshan Mine

Based on the problems of tight replacement of coal mining and difficult control of roadway surrounding rock,taking the 1604 working face of Guhanshan mine as the research background,this paper puts forward the technology of roof cutting and pressure relief to keep roadway along the goaf.Based on the theoretical analysis of the control principle of gob side and the movement characteristics of surrounding rock,the stability control system of gob side in the technology of top cutting and pressure relief is formed,and the industrial test is carried out in the field.The results show that it is feasible to use high strength prestressed anchor cable to reinforce the roof,single column π beam to support the roof and the protection system of I steel gangue.The maximum displacement of the solid coal side is 276 mm,the maximum displacement of the goaf side is 216 mm,the maximum displacement of the roof is 225 mm,and the maximum uplift of the floor is 164 mm.The deformation of the protection system of the goaf side gangue is not obvious,and the roadway is changed In a reasonable range,the effect of retaining roadways is good,which can be used for reference in similar conditions.