采场覆岩中关键层上载荷的变化规律

运用有限元方法，分析了关键层上部的载荷及下部的支承压力受软弱几何特征及力学特性影响的变化规律。结果表明：受采动影响后，关键层上部岩层的作用一段不能视为均布载荷。

VARIATION OF LOADS ON THE KEY LAYER OF THE OVERLYING STRATA ABOVE THE WORKINGS

Variation of the loads on the key layer and of the abutment pressure under the key layer, which are affected by the geometrical and mechanical behavior of the weak and soft strata, are investigated by the finite element method. It is found that the load of strata exerted on the key layer, in general, can not be regarded as a uniformly distributed load after coal is extracted.