【摘要】 为研究工作面沿断层走向推进时,断层煤柱宽度的大小对断层活化失稳与断层煤柱内部能量变化的影响,采用UDEC数值模拟软件建立平面应变模型。模拟研究了当逆断层下盘工作面的断层煤柱宽度减小时,断层煤柱内储存的能量与储能极限值的变化特征、断层活化过程与破坏趋势。研究结果表明:断层煤柱宽度减小时,煤柱支承压力峰值增大,弹性应变能增加,断层出现活化现象,并释放能量至煤柱,与弹性应变能叠加,同时断层煤柱的储能极限降低;当煤柱宽度为30 m时,煤柱中的弹性应变能首次超过储能极限值,当煤柱宽度为20 m时,煤柱中的弹性应变能量峰值为储能极限值的1.84倍。当断层煤柱宽度小于30 m时,煤柱易发生整体失稳和冲击危险,需要采取必要的灾害防治措施。更多还原

【Abstract】 In order to study the influence of fault pillar width on fault activation instability and internal energy change of fault pillar when the working face advances along the fault direction, the UDEC numerical simulation software was used to establish the plane strain model. Simulation was made to study the variation characteristics of energy and limit energy storage in fault pillar, and the fault activation process and failure trend when the fault pillar width of the footwall of reverse fault working face was reduced. The results show that when the width of the fault pillar decreases, the peak pressure of the coal pillar and the elastic strain energy increase, the activated fault releases energy into the coal pillar, which is superimposed upon the elastic strain energy, and the limit energy storage of coal pillar is reduced. When the coal pillar width is 30 m, the elastic strain energy in the coal pillar exceeds the limit energy storage for the first time. When the coal pillar width is 20 m, the peak value of the elastic strain energy in the coal pillar is 1.84 times the limit energy storage. When the width of the fault pillar is less than 30 m, the overall instability and rock burst of the coal pillar are prone to occur, and necessary disaster prevention measures need to be taken.更多还原