综放面沿空留巷围岩控制技术及矿压显现特征研究

为提高煤炭资源回收率,降低回采巷道掘进率,增加工作面顺层钻孔瓦斯的抽采时间,唐安煤矿在3313综放工作面轨道顺槽实施沿空留巷技术.3313工作面轨道巷顶板基本支护方式为锚网支护,加强支护方式为快速承载预应力锚索,留巷前后顶板支护分为一级支护与二级支护,并设计研究了巷旁支护参数和切顶参数.对综放开采条件下3313工作面轨...

Study on Surrounding Rock Control Technology and Ground Pressure Behavior Characteristics of Gob-Side Entry Retaining in Fully-Mechanized Caving Face

In order to improve the recovery rate of coal resources,reduce the excavation rate of mining roadway and increase the time of gas extraction from boreholes along working faces,the gob-side entry retaining technology is applied in the track Gateway of 3313 fully mechanized caving face in Tangan Coal Mine.3313 working face track roadway roof support for the basic support for the bolt-mesh support,to strengthen the support for the rapid loadbearing pre-stressed anchor cable,before and after retaining roadway roof support is divided into a first-level support and a secondlevel support,the parameters of Roadway side support and roof cutting are designed and studied.The study on the ground pressure behavior characteristics of the gob-side entry retained along the track of 3313 working face under the condition of fully mechanized top-coal caving mining shows that the movement of the roof of the roadway tends to ease gradually after the face is pushed over 350m,therefore,it is best to push the face over 350m before the withdrawal of the single column.