论文部分内容阅读
以某矿综放工作面开采实际为背景,通过应变法对煤层底板不同深度岩层变形程度随工作面推进的变化进行实测,得出采动矿压对底板的剧烈影响范围具有“超前”显现和“滞后”延续特点,且矿压剧烈影响超前显现距为37 m,矿压剧烈影响滞后显现距为32 m,表现为由浅及深相应减小的总体特征;结合采动底板钻孔窥视镜成像分析,确定出工作面底板采动破坏深度约为12 m;以现场实测结果为基础,采用FLAC3D数值模对煤层底板采动破坏特征进行分析,揭示出煤层开采过程中底板的三维破坏特征。采用现场应变实测、原位钻孔窥视镜观测和数值模拟相互验证的方法,对煤层底板破坏特征进行综合对比研究,弥补了以往研究手段单一的缺点。
Taking the actual mining of fully mechanized coal caving face in a mine as an example, the deformation of the coal seam floor at different depths was measured by the strain method and the change of the working face was measured. It was concluded that the severe influence range of the mining pressure on the floor had “advanced” And the “lag” continuance characteristic. The strata of mine pressure have a dramatic influence on the apparent apparent distance of 37 m and the strata of mine pressure have a hysteresis of 32 m, which shows the overall characteristics reduced by shallow and deep strata. Based on the field test results, the FLAC3D numerical model was used to analyze the mining failure characteristics of coal seam floor to reveal the three-dimensional Destroy characteristics. By the methods of field strain measurement, coherent observation in situ drilling and mutual verification by numerical simulation, a comprehensive comparative study on the failure characteristics of the coal seam floor is made to make up for the shortcomings of previous research methods.