神东浅埋综采面末采段让压开采原理及应用

针对神东矿区综采面末采段回撤过程中发生压架事故的问题,综合采用理论分析与现场实测的方法,就让压开采的原理及适用性进行了研究.结果表明,让压开采是一种通过在综采面回撤前适当位置停采来避免贯通回撤时工作面受顶板来压威胁的有效技术措施.运用停采让压,降低推进速度,可改变周期来压位置和减小来压持续长度,实现贯通时硕板无来压的目标.而合理让压位置的确定要以让压间隔煤柱稳定和贯通回撤时工作面不来压为前提.结合工作面停采让压前来压规律及停采让压时压力显现特征,提出了4种可能存在的情况.利用让压开采原理,指导了神东矿区大柳塔矿21305综采面、补连塔矿22303综采面末采段的安全回撤.

Theory and Applicable of Yield Mining at Ending Stage of Fully-Mechanized Face in Shallow Seam at Shendong Mine Area

According to the problem of support crushing accidents at the ending stage of fully-mecha-nized faces in Shendong mining area,theory analysis and practice method was adapted to research the principle and application of yield mining.The results show that yield mining is a kind of skill that can avoid the influence of ground pressure at ending stage of fully-mechanized faces by stopping mining at a proper position before removing,which can change the starting location and decrease the length of continuous pressure by reducing mining velocity and create a non-pressure surroundings.While the width of interval pillars during yield mining must be determined by taking interval pillars’ stability and non-pressure at ending stage as premise.Four probable situations are put forward according to the pressure law before stopping mining and pressure behaviour during stopping mining.Yield mining was successfully used at the ending stage of NO.21305 fully-mechanized face in Daliuta coal mine and NO.22303 fully-mechanized face in Bulianta coal mine which realizing a safe waking face removing.