摘要
近距离煤层群下行开采中,上位煤层开后造成下位煤层采场围岩力学环境发生改变,回采巷道的合理布置是下位煤层安全高效开采的关键。因此,本文以甘沟煤矿为工程背景,采用理论分析、数值计算、现场实测等手段,对上位煤层开采后,残留煤柱对底板影响进行分析。研究结果表明:利用滑移线理论确定B4-2号煤层开采后对底板影响的最大深度为18.7 m,选取内错式布置,内错距不小于6.03 m;采用UDEC数值模拟软件对B4-2煤层的残留煤柱下方底板应力分布规律分析,得到煤柱影响下的底板应力演化特征,煤层开采后残留煤柱造成底板破坏深度达20 m左右,理论部分计算符合;通过对不同内错距下塑性区域分布进行分析,得到内错距为15 m时,对下位煤层的影响最小。
In the down mining of short distance coal seams, the mechanical environment of the surrounding rock of the lower coal seam stope is changed after the upper coal seam is opened. The reasonable layout of the mining roadway is the key to the safe and efficient mining of the lower coal seam. Therefore, taking a coal mine as the engineering background, this paper analyzes the influence of residual coal pillar on the floor after mining the upper coal seam by means of theoretical analysis, numerical calculation and field measurement. The results show that the maximum depth of influence on the floor of B4-2 coal seam after mining is determined to be 18.7 m by using the slip line theory, the internal staggered layout is selected, and the internal staggered distance is not less than 6.03 m;UDEC numerical simulation software is used to analyze the distribution law of floor stress under the residual coal pillar of B4-2 coal seam, and the evolution characteristics of floor stress under the influence of coal pillar are obtained. After mining of coal seam, the damage depth of floor caused by residual coal pillar is about 20 m, which is consistent with some theoretical calculations;By analyzing the plastic regional distribution under different internal offset, it is found that when the internal offset is 15 m, the influence on the lower coal seam is the least.
作者
韩帅杰
HAN Shuaijie(Beijing Tiandi Huatai Mining Management Co.,Ltd.,Beijing 100013,china)
出处
《煤矿现代化》
2022年第2期1-5,共5页
Coal Mine Modernization
基金
天地华泰自主科技创新基金项目(编号:TDHTKY2021005)。
关键词
近距离煤层群
采空区
回采巷道
内错距
close distance coal seam group
goaf
mining roadway
internal dislocation distance
