3S1C开挖法在强膨胀富水性隧道中的应用

Application of three step with central pillar in heavily expansive rock tunnels

针对昆明铁路枢纽工程强膨胀岩浅埋富水隧道,采用现场监测和Midas-GTS有限元模拟的手段,提出强膨胀富水隧道围岩控制关键技术,构建强膨胀岩富水隧道稳定动态反馈评价体系.将三台阶加中立柱法(3S1C)与台阶法、交叉中隔墙法(CRD)进行对比,优化施工方法,达到确保工程安全、加快施工进度、节约项目成本的目的.在同等地质灾害条件下可以指导施工,有效减少施工中带来的安全事故.

According to monitoring on the spot and finite element simulation by Midas-GTS, this paper came forward the key technology about control of surrounding in heavily expansive rock and established a dynamic feedback system. In order to make sure the construction safety, speed up the construction process, and save cost of the project, this paper carried out comparative analyses on the three steps with center pillar（3S1C）, three steps seven footwork and CRD method. This method provides guidance to construction under similar condition and effectively reduce safety incidents.