特厚煤层综放开采地表沉陷规律实测研究

摘要

In order to study law of surface subsidence under situation of shallow buried depth,medium thick bedrock and extra thick seam using fully-mechanized top coal caving method,an observation station was established on surface above No. 914 Working Face of Dongpo Coal Mine.By analyzing the measured data,a set of complete prediction parameters for surface subsidenceand angular parameters were ob-tained. Under this geology and mining condition,the authors studied its mobile angle parameters and the dynamic deformation characteris-tics. The results showed that the subsidence factor was 0. 74,the displacement factor was 0. 25,the major influence tangent angle was 2. 95,and the main influence spread angle was 86.5°. It is concluded that under this situation,the initial period is short;the active period of surface subsidence velocity is large and moves violently,and subsidence in the active period occupies a high ratio of the total movement period. Under situation of shallow buried depth and medium thick bedrock,law of surface subsidence for extra thick seam using fully mechanized top coal caving method has its particularity.%为研究近浅埋深、中厚基岩、特厚煤层综放开采地表沉陷规律，在东坡煤矿914工作面地表建立地表移动观测站进行了观测。经对测得的数据分析，得到一套完整的地表沉陷预计参数和角量参数，分析了该地质采矿条件下角量参数与动态变形特征。结果表明：东坡煤矿下沉系数、水平移动系数、主要影响角正切、开采影响传播角分别为0.74、0.25、2.95、86.5°；在特厚煤层综放开采条件下，地表移动的初始期较短，活跃期内地表下沉速度大，移动剧烈，地表下沉量占总下沉量的比例大。在近浅埋深、中厚基岩条件下，特厚煤层综放开采地表沉陷规律具有其特殊性。