浅埋厚层间距煤层过上覆采空区煤柱矿压显现机理研究

Study on Developing Mechanism of Coal Pillar Pressure of Shallow Coal Seams with Thick Seam Spacing Passing Through Overlying Goaf

以南梁煤矿厚层间距煤层开采为工程背景,针对下煤层开采时过上覆采空区煤柱发生动载矿压的安全问题,通过采用物理相似模拟试验、理论分析和现场实测等方法,对工作面过上覆采空区煤柱时矿压显现机理进行研究;基于过煤柱时上覆岩层结构及其运动特征,分别建立煤柱载荷计算和关键岩块破断失稳的力学结构模型,计算确定出工作面在出煤柱位置时支架阻力发生突增;结合该工作面过煤柱的具体条件,提出了工作面采取调斜的措施,并进行现场工程应用。现场监测结果表明该防治措施对于预防过煤柱时发生动载矿压效果明显。

Taking Nanliang Coal Mine thick seam spacing mining as the engineering background,aiming at the safety problem of dynamic rock pressure occurring when the lower coal seam is mined over the pillar of the overburden goaf,this paper studies the mechanism of rock pressure appearing when the working face crosses the pillar of the overburden goaf by means of physical similarity simulation experiment,theoretical analysis and field measurement.Based on the structure and movement characteristics of overlying strata crossing the coal pillar,the mechanical structure models of load calculation of coal pillar and failure and instability of key rock blocks are established respectively,and the resistance of support increases sharply when the coal pillar is located in the working face.Combining with the concrete conditions of the working face passing through the coal pillar,the measures for adjusting the inclination of the working face are proposed,and the field engineering application is carried out.The field monitoring results show that the prevention measures have obvious effect on preventing dynamic rock pressure during passing through coal pillars.