山体浅埋煤层覆岩的应力分布规律

Stress Distribution Rules of Overlying Strata in Shallow Coal Seam under Mountain Valley

为了掌握山体浅埋煤层原岩应力场的分布规律,运用数值计算的方法,研究了山体浅埋煤层原岩垂直应力与水平应力的分布特征、上覆岩层的垂直应力分布特征、应力梯度的变化。垂直原岩应力分布形式与地表形态非常相似;水平原岩应力在埋深较大处的岩层软弱面结合处有应力集中现象。山体浅埋煤层及断裂带老顶上的垂直原岩应力呈线性变化;在埋深较大处,应力值较大,埋深较小处,应力值较小;沿煤层倾斜方向垂直原岩应力变化梯度较大。研究结果可为类似条件下工作面的支护参数的选取提供借鉴。

In this paper we used numerical calculation to study the distribution law of the rock stress in shallow seam under mountain body.We have calculated the distribution of the horizontal stress and vertical stress in this kind coal seam,the distribution of the vertical stress in overlying strata and the relationship between the stress gradient and buried depth.We know that the distribution form of the vertical rock stress is like the surface configuration and there is horizontal rock stress concentration in deeper rock weak plane.The vertical rock stress varies linearly in shallow seam under mountain body and main roof at fault zone.When the depth is larger,the stress value is lower and vice versa;Vertical stress gradient is large along vengeance direction of coal seam.The result can be used for the working face＇s support parameter in this kind coal seam.