急倾斜煤层开采对地表沉陷影响的数值模拟

Numerical analysis of surface subsidence behavior relative to steep excavation

针对急倾斜煤层开采复杂的采矿地质条件,运用求解非线性大变形问题有限差分法(FLAC),对不同开采方案所引起的岩体移动和地表沉陷进行了研究,总结出了岩体移动的基本特征和地表沉陷的相关参数.结果表明:煤层开采对地表沉陷的影响有一个发展变化的过程,呈现出较为明显的阶段性,在开采影响剧烈区内应该加强对重点部位的加固与维护;综合比较4个开采方案,煤层区段间正台阶顺序开采较为有利,地表构筑物受采动损害小,区段间相互影响小,有利于巷道布置.

According to the complex mining geological condition of steep excavation , FLAC program are carried out for strata movement and surface displacement due to coal extraction by different mining layouts. The basic features of strata movement, the fundamental behavior of related parameters of surface displacement are obtained. The result shows that coal mining has an influence course of development and change to earth's surface sink, which appears to be comparatively obvious stage,the intensity influence district should be reinforced and maintained; Compare four mining plans synthetically, coal seam sector step order mining comparatively favorable. The earth's surface damaged structures is comparatively light, it has an lightly influence on each sector and be favorable to the roadway assigned.