上覆岩层组合运动的力学解析特征研究

运用弹性薄板理论和复合材料力学的层合板理论,讨论了在覆岩运动中起决定作用的组合关键层的应力,为计算组合关键层的整体强度提供了途径;并且从控制开采沉陷工程实际入手,将结构塑性极限分析理论运用于组合关键层的失稳最大荷载计算,解析得出了充分采动情况下关键层塑性极限荷载的表达式,从另一个角度得到了一种判别关键层位置的新方法,为实施离层带注浆减沉提供参考。

STUDY ON THE MECHANICAL CHARACTERISTICS OF COMBINED MOTION OF OVERLYING ROCK STRATUM

The combined key stratum is regarded as a crucial factor for the motion of overlying rock strata. The stress of the combined key stratum is discussed on the basis of elastic thin slab theory and the laminated slab theory of compound material mechanics. The study result provides an approach to calculate the overall strength of the combined key stratum. In the actual engineering practice of mining subsidence controlling, the maximum load for instability of the combined key stratum is calculated by using the structural plastic limit analysis theory and the expression of the plastic limit load of the key stratum was obtained on the condition of sufficient mining. On this basis, a new method for judgment of the key stratum position is also found from another point of view. The result provides a reference for grouting and reducing subsidence.