松散膨胀复合型软岩巷道的管棚超前支护技术研究

Research on pipe-shed advance support technology for loose and expansive compound soft-rock roadway

沙吉海煤矿轨道石门围岩松散、膨胀,在掘进过程中频繁发生片帮、漏顶的现象,为解决顶板支护难的问题,通过现场工场地质调查,应用软岩工程力学理论具体分析了其破坏机理并有针对性地提出了管棚超前支护+锚网索耦合支护对策。在分析超前管棚的支护作用机理的基础上,借助FLAC3D对轨道石门进行了管棚超前支护的数值模拟研究。结果表明,恒阻大变形锚杆(索)起到了转移围岩的高应力、释放一定变形能的作用。而超前管棚在巷道开挖前就已对松散顶板实行了预加固,增强了围岩的整体性、稳定性,同时也消除了片帮、漏顶现象的发生。最后进行了管棚超前支护+锚网索耦合支护与施工工艺设计,并成功应用于现场。

Surrounding rock of track Shimen in Shajihai coal mine is loose and expansive, roof leakage and rib spalling phenomenon occurs frequently in the tunneling process. To solve the roof support problem the failure mechanism is analyzed through the workshops geological survey and the application of soft rock engineering mechanics theory. Then support measures of pipe-shed advance support ＆ bolt-net-anchor coupling support are proposed. On the basis of analysis on action mechanism of pipe-shed advance support, track Shimen numerical simulation of. pipe-shed advance support was carried out with the help of FLAC3D. The results shows that the constant resistance with large deformation bolt（cable）play a role of transferring high-stress and releasing deformation energy. The advanced pipe-shed carry out pre-reinforcement, enhance the integrity, stability of surrounding rock, and eliminates roof leakage, rib spalling phenomenon. At last the support and construction process design of pipe-shed advance support ＆ bolt-net-anchor coupling support is carried out, and have been successfully applied to the scene.