深部开采复合顶板离层稳定性判别

Discrimination of Stability Between Layers of Compound Roof in Deep Mining

为研究深部开采复合顶板力学机理,分析离层稳定性判别标准及依据,采用数值模拟方法分析了不同条件复合顶板结构面剪应力、法向拉应力和离层分布特点.结果表明:法向拉应力是结构面中部离层的主要原因,可用法向拉应力作用范围作为结构面离层范围,并作为离层稳定性判别标准,结构面离层范围及其离层值分布具有相关性,结构面离层范围扩展使结构面不同位置离层值分布趋于均匀,但对结构面最大离层值影响并不显著,以离层值作为离层稳定性判据时,应采用允许离层范围两端离层实测值与临界值进行比较来判别.

In this paper,we study the mechanical mechanism,analyze the stability discrimination standards,and discuss the distribution of shear stress,normal stress,and tensional stress of structural plane of the compound roof under different conditions.The result shows that the main cause of bed separation of the structural plane is the normal tensional stress in the middle part.So the action sphere of the normal tensional stress can be considered as bed separation range and as the discrimination standard of the bed separation.The distribution of interlayer separation of bed separation is related to separation size of the structural surface and makes the bed separation tend to be uniformed.