大倾角不等长工作面矿压显现特征研究

Study on the Characteristics of Mining Pressure Development of Unequal Length Working Face with Large Dip-Angle

为了解决大倾角煤层不等长综采工作面回采衔接点处围岩控制的难题,以淮南某矿12124工作面为研究对象,采用数值模拟和现场观测方法,构建了不等长工作面FLAC3D数值模拟试验模型。开展了不等长工作面衔接点处围岩应力演化规律与控制方法研究。数值模拟结果表明:(1)受煤层开采与切眼2的叠加影响,工作面对接前后垂直应力出现先增大后减小的变化趋势,且工作面倾向不同位置点的围岩应力变化呈现非对称性;(2)通过衔接点前后支承压力演化过程的对比分析,确定工作面衔接点处为矿压重点防控区域。结合数值模拟结果及现场观测,提出了不等长工作面支架对接技术以及顶板管理措施,工作面回采顺利,实现了工作面的安全高效开采。

In order to solve the difficult problem of surrounding rock control of connection point in unequal length fully mechanized working face with large dip angle seam,using numerical simulation and field observation method,FLAC3D numerical simulation test model of unequal length working face was established by taking 12124 working face of a mine in Huainan as the research object,and mining-induced stress evolution and control method of surrounding rock in unequal length working face were studied.Numerical simulation results show that:(1)Due to the superposition of coal seam mining and hole cutting 2,the vertical stress before and after the butt joint of the working face first increases and then decreases,and the stress change of the surrounding rock along the different inclined points of the working face tend to be asymmetrical;(2)Through the comparative analysis of the evolution process of support pressure before and after the connection point which is determined to be the key prevention and control area of mine pressure.Combined with the numerical simulation results and field observation,the support butt joint technology of unequal length working face and the roof management measures are put forward,and the safe and efficient mining of working face was realized.