隆德煤矿3-1煤覆岩垮落及孔隙率演化规律研究

Research on the caving and porosity evolution law of 3-1 coal overlying rock in Longde Coal Mine

煤矿水体下开采面临着多种水害问题,是一项新的技术难题,隆德煤矿下部3-1煤开采便面临此类较大的安全威胁,因此,开展复合水体下安全开采技术研究意义重大。本文结合煤层的地质赋存资料,分析煤层的赋存特征,采用PFC^(3D)离散元数值分析软件模拟3-1煤层的开采过程,研究煤层开采过程中的覆岩裂隙场演化特征,并结合理论分析的手段计算开采过程中的覆岩孔隙率、渗透率动态演化数据和覆岩破坏高度。

Mining under water bodies in coal mines faces a variety of water hazards,which is a new technical problem.The mining of 3-1 coal in the lower part of Longde Coal Mine faces such greater safety threats.Therefore,it is of great significance to carry out research on safe mining technology under composite water bodies.This paper combines the geological occurrence data of coal seams to analyze the occurrence characteristics of coal seams,uses PFC^(3D) discrete element numerical analysis software to simulate the mining process of the 3-1 coal seam,studies the evolution characteristics of the overburden fissure field in the coal seam mining process,and combines theoretical analysis.Method to calculate overlying rock porosity,permeability dynamic evolution data and overlying rock failure height during mining.