迈式管棚治理风积砂质黄土隧道塌陷下沉侵限施工技术

风积砂质黄土是极易发生崩塌的土质,在隧道掘进开挖施工中会造成开挖工作面的失稳,如遇湿陷性时,会产生很大的塌陷、沉陷、下沉侵限变形和承载能力的丧失。结合准池铁路朔州隧道采用大直径迈式自钻式锚杆作为管棚超前支护工程实例,对处理风积砂质黄土段塌陷、下沉、侵限体,具有钻进、注浆、锚固施工一体化作用,施工进度快,不需要开挖钻场,钻进不需要下套管,施工方便、快捷,值得推广。

Construction Technology to the Treatment of Subsidence Sink Invasion of Aeolian Sandy Loess Tunnel with Walking Type Pipe Shed

Aeolian sandy loess is prone to collapse, which will cause the instability of working face excavation in tunnel ex- cavation. In the case of collapse great subsidence invasion deformation and bearing capacity loss is about to occur. On the basis of Shuozhou railway tunnel on Huaichi railway with large diameter waiking drilling anchor as pipe shed advance sup- port project, the system is equipped with a integrated functions of the treatment of collapsing, subsidence, invasion, drill-ing, grouting, anchoring construction of aeolian sandy loess section,which has the advantages of fast construction progress, freedom from excavation drilling site, drilling without casing, convenient and fast construction. It is worthy of promotion.