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。
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