新集二矿1煤层底板破坏深度模拟研究

通过分析新集二矿1煤层水文地质条件,在获取力学参数的基础上,采用数值模拟软件FLAC3D对1煤层底板的破坏深度进行了模拟,结果表明:1煤层底板最大破坏深度为19.17 m;底板最大破坏深度出现在工作面推进30～40 m位置,此处最容易发生突水事故。研究结果对于实现新集二矿1煤层的安全开采,为后期工作面的防治水方案设计以及防治水措施制订提供了科学依据。

Simulation Study on Failure Depth of No.1 Seam Floor in Xinji No.2 Mine

The failure depth of No.1 seam floor was simulated by using the numerical simulation software FLAC3D on the basis of the analysis of the hydro-geological conditions of No.1 seam in Xinjin Mine and the acquisition of the mechanical parameters.The results showed that the maximum failure depth of No.1 seam floor was 19.17 m;the maximum failure depth of the floor appeared at 30-40 m place of the face advance,where the water inrush accident was most likely to occur.This research result can provide the scientific basis for the realization of safe mining of No.1 seam in Xinji Mine,the design of water control and prevention scheme and the working out of water control and prevention measures for next working face.Research on Mechanism of Water Inrush from Floor Subsided Column and Its Application(12)-The water-conducting subsided columns often bring larger hidden troubles to safe production in coal mines,so it is very necessary to analyze the mechanism of water inrush from subsided columns.In engineering practice,most of subsided columns are in irregular frustum form,in this study,the subsided column model was simplified as a frustum form so as to make it closer to the engineering practice,the Mohr-Coulomb strength criterion and the Limit Equilibrium theory were used to analyze the water inrush mechanism from the floor subsided columns,the limited water pressure of water inrush from the floor was solved,the water inrush from floor in a mine was predicted,and some preventive measures were put forward.