长沟峪煤矿急倾斜煤层群裂隙演化及渗流规律

以北京长沟峪矿区急倾斜煤层群为工程背景,利用离散元方法分析计算煤采动影响下覆岩裂隙场演化以及降雨入渗规律;随着急倾斜煤层群分部开采,采动裂隙场存在顺序叠加现象,采动影响下覆岩裂隙分布复杂性呈现非线性递增趋势,并逐步形成裂隙演化阻水机制。利用分形理论计算张开裂隙与闭合裂隙的分布维数,得出裂隙闭合率与采空区入渗量之间存在非对称曲线关系,并且入渗量变化滞后于阻水结构的形成。

Fracture evolution and seepage rule of steeply inclined coal seam group in Changgouyu coal mine

Taking the steep inclined coal seam group of Changgouyu coal mine for the engineering background,the paper analyzed the fracture development rule of overlying strata influenced by mining and seepage with discrete element method(DEM).Along with gradually minging,mining-induced fracture field order stack,the complex distribution of fracture evolvement in surrounding rocks is nonlinear increase trend,this trend will create the physical mechanism of water-blocking.Through calculating the fractal dimension of opening and closeing of fracture by fractal theory,the paper obtained that the relationship between crack closure rate and seepage flow of mined-out areas is non-symmetrical curve,and the infiltration’s change fall behind the formation of water-blocking structure.