首采工作面不同开采厚度条件下覆岩破坏范围分析

Analysis of failure extent of overlying strata under different mining thickness conditions of the first mining face

为分析三交河煤矿首采工作面在不同采厚条件下的覆岩破坏范围,采用2D-Block离散元数值模拟软件对采厚分别为4、6、8、12、14、16和18 m单工作面开采后覆岩法向和层间裂隙破坏情况与分布规律进行研究。按覆岩法向裂缝和层间裂缝分别研究,综合确定了覆岩裂缝的分布形态,并按覆岩内部水平变形值大小和特点进行了裂缝分区,分别为:严重破裂区、微小破裂区和重新闭合区。得到采厚不同时,垮落带和裂缝带高度均随采厚的增加而增大,当采厚达到14 m时,垮落带和裂缝带的高度均达到最大,而后随采厚的增加,垮落带和裂缝带的高度不再增加。

In order to analyze the overburden fracture range of the first mining face in Sanjiaohe Coal Mine under different mining thickness conditions, the 2 D-Block discrete element numerical simulation software was used to study the failure and distribution of overburden normal and interlaminar fractures after mining with 4, 6, 8, 12, 14, 16 and 18 m mining thickness single working faces. The overburden normal cracks and interlaminar fractures were studied separately, and the distribution patterns of overburden fractures were comprehensively determined. According to the horizontal deformation values and characteristics of the overburden, the fractures were divided into： severe rupture zone, micro rupture zone and re-closed zone. When the thickness is different, the height of the fall zone and the fracturation zone increase with the increase of the thickness. When the thickness reaches 14 m, the height of the fall zone and the fracturation zone reach the maximum, and then with the increase of the thickness, the height of the fall zone and the fracturation zone no longer increases.