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为了研究回采过程中相邻采空区工作面不同尺寸煤柱中的采动应力变化规律,针对兴隆庄煤矿七采区冲击地压防治的实际需要,采用离散元数值模拟研究了相邻采空区煤柱的采动应力、塑性区和顶板下沉量变化规律。研究表明:开采过程中所留设的煤柱,受两侧采空区的影响而产生压力叠加,形成较高的煤柱支承压力;随着工作面的推进,煤柱中的双峰应力逐渐合二为一,应力峰值并逐渐增大,在煤柱附近及其上下方的应力集中区内,最容易产生冲击地压。实践证明:模拟结果与现场实际基本相符。
In order to study the variation law of mining stress in coal pillars of different sizes in working face of adjacent goaf during the mining process, according to the actual need of rock burst prevention and control in the seventh mining area of Xinglongzhuang Coal Mine, the discrete element numerical simulation was used to study the influence of adjacent mining Mining coal pillar stress, plastic zone and roof subsidence changes. The results show that the coal pillars left in the process of mining are superposed on both sides of the gob and the pressure of the coal pillars is higher than that of the coal pillars. With the advancing of working face, the bimodal stress gradually increases Combined into one, the peak stress and gradually increased in the vicinity of coal pillars and the upper and lower stress concentration area, the most prone to rock burst. Practice has proved that the simulation results are basically in line with the actual situation in the field.