极近距离特厚煤层复杂条件下综放工作面矿压显现规律研究

以30515工作面为研究对象,对回风巷受上部2煤遗留区段煤柱影响,煤炮发生较频繁,局部区域巷帮破坏及水平位移明显的现象进行分析,采用FLAC3D模拟工作面上部实体煤和上部集中煤柱条件下支承压力分布。通过模拟可知,受上部集中煤柱的影响,工作面超前应力最大值为35MPa,超前工作面约28 m,小于不开挖上部2煤特厚煤层综放工作面两侧为实体煤条件下的42 m。

Study on Strata Behavior Law of Fully-mechanized Caving Face under Complex Conditions of Extremely Close and Extremely Thick Coal Seam

The return airway of 30515 working face is affected by sectional coal pillars left over by the upper No.2 coal seam, so coal burst occurs frequently.This paper analyzed the obvious damage and horizontal displacement of the roadway side in the local area, and used FLAC3D to simulate the support pressure distribution under the condition of the upper solid coal and the upper concentrated coal pillar. It can be seen from the simulation that under the influence of the upper concentrated coal pillar, the maximum value of the advance stress of the working face is 35 MPa.The maximum stress is about 28 m ahead of 30515 fully-mechanized top coal caving face, less than 42 m under the condition that the two sides of the fully-mechanized top coal caving face in No.2 coal seam and the extra thick coal seam are solid coal.