赵各庄矿大倾角煤层综放开采突水条件的力学机理分析

为揭示突水发生的力学机理，以矿区典型地质剖面为基础，运用FLAC^3D软件建立二维有限差数值模拟模型，通过数值模拟方法，对不同开采阶段岩石巷道围岩应力进行模拟计算，并分析其突水发生的可能类型和方式.结果表明，处于地质体内不同部位的岩石巷道围岩应力的变化与主采煤层的开挖过程有条件地相关，以致其突水类型也有所不同;位于断层上盘的通风道处围岩应力易受开采条件和开采进度的影响，并易于产生由采动诱发所引起的突发性突水灾害事故，其突水水源为奥陶系灰岩岩溶裂隙承压水；而位于断层下盘的电车道处围岩应力受开采影响较小，其突水水源为煤层顶板、底板薄层状裂隙承压水.

Mechanical mechanism analysis of water inrush condition on mechanized top-coal caving in steep seam in Zhaogezhuang coal mine

To reveal the mechanical mechanism of the water inrush, the 2D finite difference numerical simulation model was built with FLAC^3D based on the typical geology profile of the coal mine. It was for simulating the wall rock stress around tunnels in different mining period, analyzing the possible water inrush type and the way as well. The results show that the changing of wall rock stress around tunnels located in different geological body is conditionally related with the mining process in mainly mining coal seam, and therefore leads to different water inrush types. The ventilation tunnel located in upper wall of fault is more influenced by mining process and method, and tends to be induced disaster of water inrush by mining action, and the source of water inrush comes from the fracture confined water in Ordovician limestone; the traffic tunnel located in lower wall of fault is less affected by mining act, and the source of water inrush is from the fracture confined water lying in the floor and seat of coal seam.