浅埋隧道塌方处治方法研究

根据工程塌方处治实例,探讨了浅埋隧道塌方处治中超前支护系统的作用原理,利用有限元手段分析了二次衬砌结构的内力情况,给出了塌方处治方案,根据处治效果可得出:(1)管棚注浆法作为一种行之有效的辅助工法,其力学效应是显著的;(2)处于浅埋顺层围岩条件下的隧道,围岩的变形往往带有突然性;(3)施工中及时构筑二次衬砌,早日形成封闭式支承体系,加快围岩变形稳定过程,可有效地抑制围岩过度变形及塌方事故。

TREATMENT METHOD FOR COLLAPSE TREATMENT OF SHALLOW-BURIED TUNNEL

Based on an engineering case,the mechanism of the pre-support system applied in treatment for the collapse of shallow-buried tunnel is discussed.Moreover,the internal force of the second lining is analyzed by means of FEM and the procedure to treat the collapse of shallow-buried tunnel is given.Some conclusions can be drawn based on the treatment effectiveness:(1) shed-pipe grouting technology is an effective assistant construction method,and the mechanical effect is significant;(2) the deformation of the tunnel bedding wall rock often has some abruptness;and(3) the second lining should be constructed in time so as to form the closed-end supporting system earlier,which can accelerate the stabilization process of the deformation of surrounding rock and prevent the excessive deformation of surrounding rock and tunnel collapse.