长壁工作面Y型通风护巷充填墙体合理设计

Study on reasonable design of filling wall for Y-type ventilation roadway in long wall working face

为解决高瓦斯矿井工作面回采期间上隅角瓦斯积聚危害安全生产问题,通过工程调研、室内实验、精细化数值模拟和工业性试验的综合方法研究了Y型通风护巷充填墙体合理参数设计。结果表明:膏体材料制成的标准试件在养护时间为10 d时单轴抗压强度已达到最终强度的89%;采空区、充填墙体和煤岩层选用不同本构方程的精细化三维模型的模拟结果更加准确;充填墙体宽度为2.5 m时巷道围岩锚杆/索轴向受力、移近变形量和塑性区控制效果最优;现场应用期间巷道横截断面大于9.0 m2,充填墙体自身所受承载力小于其自身单轴抗压强度;可见充填墙体为2.5 m时设计合理。

In order to solve the upper corner gas accumulation problem of a high gas mine,a reasonable parameter design of the filling wall of Y-type ventilation roadway was studied by the comprehensive methods of engineering investigation,laboratory experiment,refinement numerical simulation and in-situ test.The results show that the uniaxial compressive strength of the standard specimen made by filling material can be reached 89%of the final strength when the curing time is 10 days;the refinement three-dimensional model with different constitutive equations for gob,filling wall,coal and rock mass is more accurate;when the width of filling wall is 2.5 m,the axial stress of bolt and cable,convergence,plastic zone of surrounding rock are under reasonable control;the cross section of roadway is larger than 9.0 m2,and the bearing capacity of the filling wall are reasonable during the in-situ test period.It is concluded that the reasonable size design of filling wall is 2.5 m,and the research method can provide guidance for other mines with similar conditions.