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针对复采工作面过冒顶区时工作面易发生煤壁滑帮、端面冒漏以及顶板来压强度大等特点,以晋煤集团圣华煤业3101复采工作面为工程背景,运用相似模拟对复采工作面过冒顶区时顶板破断特征、支承压力分布特征以及支架受力状态进行研究,依据相似模拟结果建立复采采场力学模型,推导液压支架支护强度的计算公式,提出复采工作面过冒顶区时的围岩控制技术。研究结果表明:(1)工作面过冒顶区时采场顶板易形成大厚度、长跨距的超前大断裂;(2)冒顶区弱化了顶板岩梁的应力传递,加剧了支承压力的荷重集度;(3)液压支架受顶板超前大断裂的影响,支架工作阻力在通过冒顶区前呈突变性增加,模拟结果支架支护阻力最大值为16 200 k N,理论计算支架支护阻力为16 110.5 k N;(4)复采工作面在通过冒顶区前必须对冒顶区进行注浆充填,同时给出支架工作阻力随充填体强度变化的关系式,为复采采场顶板控制提供理论依据。
Aiming at the characteristics that coal face slip, face riser leakage and roof compressive strength are prone to occur when the coal mining face passes through the roof-fall area, taking the 3101 mining face of Shenghua Coal Mining Company of Shanxi Coal Group as the engineering background, Based on the similar simulation results, the mechanical model of the mining stope is established, and the formula for calculating the supporting strength of the hydraulic support is deduced, and the compound mining method is proposed Surrounding rock control technology when the working face passes the roof area. The results show that: (1) The roof of the stope can easily form large thickness and long-span advanced big faults when the working face passes the roof-fall area; (2) The roof-top area weakens the stress transfer of the roof rock beam and aggravates the load- (3) The hydraulic support is affected by the leading and big fracture of the roof, and the working resistance of the support shows a sudden increase before passing through the top of the roof. The simulation result shows that the maximum support resistance of the support is 16 200 kN and the theoretical support support resistance is 16 110.5 kN; (4) Before the mining face passes through the roof area, the roof area must be filled with grouting and the relationship between the working resistance of the support and the strength of the filling body is given, which provides a theoretical basis for roof control of the mining face .