黄土丘陵区特厚煤层保护性开采技术分析

Technical analysis on extra thick coal seam protective mining in loess hilly area

我国中西部黄土丘陵矿区地形复杂,冲沟发育,黄土层抗拉强度小、垂直节理发育,受采动影响后极易产生裂缝、台阶,且黄土地表受采动影响后移动变形剧烈、变形速度快,地表移动变形十分复杂。为确保地面建(构)筑物安全使用,文中在分析黄土丘陵区地表移动变形特征及地表建(构)筑物抗采动变形能力的基础上,对瑞隆煤矿8103工作面采取保护性开采措施,根据观测8103工作面开采后,地表移动变形未波及工业广场南侧护坡坡体,未影响工广建(构)筑物,仅对部分高压线塔产生轻微影响。

The topography of the loess hilly area in central and western China was complex and the gullies were developed. Tensile strength was low and the vertical joint was developing in the loess layer. After being affected by mining, cracks and steps were easily generated, and the loess surface was severely deformed affected by mining and the movement, the deformation speed was fast, and the surface movement deformation was very complicated. In order to ensure the safe use of ground structures, in this paper, the characteristics of surface movement and the deformation in the loess hilly areas and the anti- deformation capability of surface buildings （structures） were analyzed, and the protective mining measures for the 8103 workface were adopted in Ruilong Coal Mine. According to observation after the mining of the working face, the deformation of the surface did not affect the slope body on the south side of the industrial square, and did not affect the buildings （structures）, and only slightly affected some of the high voltage towers.