厚冲积层急倾斜煤层群开采重复采动下的开采沉陷

Repetitive mining subsidence with thick soil layers and steep seam

针对新集三矿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;实验表明,煤层区段间正台阶顺序开采较为有利.区段间相互影响小,地表受采动损害小,有利于巷道布置.运用实验室相似模型试验方法对煤层开采引起的岩体移动和地表沉陷的基本规律进行了研究,发现地表处出现了水平移动的“指向异化”;而岩层土与表土层界面处出现了水平移动指向上山方向“指向同化”.综合模型试验和数值模拟的结果,总结出了新集三矿急倾斜煤层开采重复采动所引起的厚冲积层岩体移动基本特征和地表沉陷的相关参数.

According to the complex condition of deep excavation in Xinji Mine, FLAC program was carried out for strata movement and surface displacement due to coal extraction by different mining layouts. Experiments show that coal seam sector step order mining comparatively favorable. The earth＇ s surface damaged structures is comparative- ly light, it has an lightly influence on each sector and be favorable to the roadway assigned. Similarity simulation test was performed for strata movement and surface subsidence due to coal extraction, direction assimilation of hori- zontal movement is appeared in earth＇ s surface, direction dissimilation of horizontal movement on the interface between rock bedding and soil layer is come on the scene. Based on the results of the model test and numerical simulation, the fundamental behavior of related parameters of surface displacement were obtained.