综采工作面回撤通道围岩支护稳定性分析

Stability analysis of surrounding rock supporting of retreat passage in fully-mechanized mining face

综采工作面回撤通道围岩支护的稳定性,直接影响综采工作面回撤通道的使用,决定煤矿生产效率。为此,以某煤矿为例,分析其地质、综采工作面和回撤通道情况后,采用锚网索支护结构,完成回撤通道围岩的支护构建。利用三维有限差分程序,设置回撤通道围岩支护结构模型的边界结构,并确定岩土力学计算参数。通过逐步开采阶段分析方法,分析回撤通道围岩支护的稳定性。研究结果表明,该方法具备良好的应力模拟和分析效果,顶板的位移和变形较为平稳,可提高主回撤巷道围岩应力和巷道支架承载压力,保证设备的安全撤回,验证该方法的可靠性。

The stability of the wall rock support of the withdrawal passage in the fully-mechanized mining face directly affects the use of the withdrawal passage in the fully-mechanized mining face and determines the production efficiency of the coal mine.Therefore,taking a coal mine as an example,after analyzing its geology,fully-mechanized mining face and withdrawal passage,the anchor mesh cable supporting structure is adopted to complete the support construction of the surrounding rock of the withdrawal passage.The boundary structure of the surrounding rock support structure model of the withdrawal passage is set by using the three-dimensional finite difference program,and the calculation parameters of geotechnical mechanics are determined.The stability of the surrounding rock supporting of the withdrawal passage is analyzed by the analysis method of the progressive mining stage.The research results show that this method has good stress simulation and analysis effect,the displacement and deformation of roof is relatively stable,the surrounding rock stress of main withdrawal passage and the bearing pressure of roadway support can be improved,the safe withdrawal of equipment can be ensured,and the reliability of this method is verified.