Because the upper rocks are influenced after the mining lower coal, they glide along the primary bursting surface, and the upper rock layers can form surface-contact fabric by its shear and bulge function.
Because the upper rocks are influenced after the mining lower coal, they glide along the primary bursting surface, and the upper rock layers can form surface-contact fabric by its shear and bulge function.
作者认为，下煤层开采后上覆顶板岩层受到二次扰动，其破坏移动主要是沿原有破裂面滑移，由于剪胀的作用，上覆岩层能够形成面接触的覆岩基本结构特征。