随着人们对大变形现象认识的不断深化,对于挤压性软弱围岩隧道的支护,除了锚、注一体化常规的围岩加固支护系统外,还有采用可缩式支护措施。这种支护的理论依据是,当开挖引起的围岩扩容不可避免时,允许围岩发生适度的变形,这样可以降低作用于结构上的支护压力,从而减少超挖量并降低支护强度。其具体措施是适当超挖,开挖后立即架设可缩的初期支护。 With the deepening of people’s understanding of the phenomenon of large deformation, compressive support for weak surrounding rock tunnel, in addition to anchor, injection consolidation conventional rock surrounding the support system, there are the use of retractable support measures. The theoretical basis of this support is that when surrounding rock expansion caused by excavation is unavoidable, moderate deformation of the surrounding rock is allowed, so that the supporting pressure acting on the structure can be reduced, thereby reducing the over excavation and reducing the support strength. The specific measures are appropriate over-excavation, erection immediately after the erection of the initial support.