多因素影响下承压水工作面底板破坏规律研究

Study on the Failure Law of Confined Water Working Face Floor under the Influence of Multiple Factors

以淮北某矿7222工作面为研究背景,针对其煤层赋存情况和水文地质条件,确定影响承压水底板的主控因素有煤柱宽度、工作面推进长度、工作面长度及采高。借助数值模拟软件FLAC3D5.0对在不同煤柱宽度、采高、工作面长度及工作面推进长度条件下底板塑形区域进行系统研究,分析底板破坏深度的演化规律,分析结果表明:底板破坏深度随煤柱宽度的增加呈线性减小趋势,随工作面推进长度的增加呈对数递增状态,随着工作面长度和采高的增加呈线性递增状态。本文通过分析软件SPSS对各主控因素与底板破坏深度的规律进行多元非线性回归分析,建立了承压水工作面底板破坏深度预测模型,预测结果与实测情况基本相符,该模型建立对煤矿的安全生产具有重要的指导意义。

With the working face 7222 of a mine in Huaibei as the research background,and in view of the coal seam occurrence and hydrogeological conditions,it is determined that the main control factors affecting the confined water floor are coal pillar width,working face advancing length,working face length,and mining height.With the help of numerical simulation software FLAC3 D5.0,the floor shaping area under different coal pillar widths,mining heights,working face lengths,and advancing lengths is systematically studied to analyze the evolution law of floor failure depth.The analysis results show that the floor failure depth decreases linearly with the increase of coal pillar width,increases logarithmically with the increase of working face advancing length,and increases linearly with the increase of working face length and mining height.In this paper,the main control factors and the law of floor failure depth are analyzed by multivariate nonlinear regression with SPSS,and the prediction model of confined water working face floor failure depth is established.The prediction results are basically consistent with the actual situation,and the establishment of this model has important guiding significance for the safety production of coal mines.