Abstract The deformation mechanism and characteristics of the support structure of the D2K253+935~D1K255+040 section of the Hongqiaoguan tunnel on the Chengdu-Lanzhou railway, which passes through a debris flow fan, are discussed in this paper. Additionally, the control techniques and measures for the problems of deformation encountered during construction of the tunnel are presented. The practice results show that adopting an anchoring pile may enhance the longitudinal stiffness and bearing capacity of the primary support and control its settlement and deformation, thereby guaranteeing construction safety and improving driving efficiency.
Abstract：
The deformation mechanism and characteristics of the support structure of the D2K253+935~D1K255+040 section of the Hongqiaoguan tunnel on the Chengdu-Lanzhou railway, which passes through a debris flow fan, are discussed in this paper. Additionally, the control techniques and measures for the problems of deformation encountered during construction of the tunnel are presented. The practice results show that adopting an anchoring pile may enhance the longitudinal stiffness and bearing capacity of the primary support and control its settlement and deformation, thereby guaranteeing construction safety and improving driving efficiency.
2016, Vol. 53 