带压开采工作面长度对底板破坏深度的影响

Study on Influence of the Length of Working Face on Failure Depth of Floor in Mining Above Aquifer

煤层底板承压水对工作面安全回采影响很大,为研究带压开采工作面长度对底板破坏深度的影响,以某矿生产条件为例,基于弹性力学半平面体理论,建立支承压力与承压水压力耦合作用下底板应力分布模型,计算得到底板应力分布状态解析解,利用Mathematica软件进行数据处理,并将应力分布图像化。取得以下研究结果:带压开采底板破坏深度与工作面长度正相关,最大破坏深度出现在工作面倾向中部;该矿底板允许最大破坏深度为13m,工作面长度应不大于110m。该模型为带压开采合理工作面长度的确定提供了参考依据。

The confined water of coal seam floor has a great influence on the safe mining of working face.In order to study the influence of the length of working face on the failure depth of floor in the mining above aquifer,according to the production conditions of a mine,a floor stress distribution model under the coupling effect of abutment pressure and confined water pressure was established based on the theory of half plane body of elasticity.And the analytical solution of floor stress distribution was calculated,and data processing was carried out by Mathematica software,so that the stress distribution can be visualized.The following research results are obtained.Firstly,there is a positive correlation between the failure depth of the floor and the length of the working face in the mining above aquifer,and the maximum failure depth occurs in the middle of the mining face.Secondly,the maximum allowable failure depth of the floor is 13 m,and the length of the working face should not be larger than 110 m.The model can provide a reference for determining the reasonable length of working face in the mining above aquifer.