第三系富水泥质弱胶结粉细砂岩地层隧道工序写实  

Tunnel Construction Procedures in a Tertiary Water-Rich Fine Sandstone Stratum with Weak Muddy Cementation

作　　者：司剑钧[1] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《现代隧道技术》2014年第2期115-121,共7页Modern Tunnelling Technology

摘　　要：兰渝铁路桃树坪隧道施工初期通过第三系粉细砂岩地层段,遇水围岩软化现象明显,常规施工工法已无法保证隧道正常施工,施工风险极大。文章在以"重降水、密导管、强支护、辅注浆"为指导的前提下,通过工序写实对前期的各项施工工法、辅助措施进行了验证并归类;针对第三系富水泥质弱胶结粉细砂岩地层,重点对洞内降水、超前支护、支护结构及径向注浆等工序进行了验证分析,为隧道正洞支护参数设计的合理性提供了实践依据。During the early stages, the construction of the Taoshuping tunnel on the Lanzhou-Chongqing railway in a tertiary water-rich fine-sand stratum is very difficult and highly risky because of the softening of surrounding rock that encounters water. In this paper, construction methods and relevant auxiliary measures for this early stage are verified and categorized by establishing procedures on the premise of emphasizing dewatering, increas- ing pipe density, improving support and matching grouting. Aiming at the tertiary water-rich fine sandstone stra- tum with weak muddy cementation, this paper focuses on the verification and analysis of procedures like in-tun- nel dewatering, advance support, support structure and radial grouting, providing a practical basis for the design rationality of support parameters for the main tunnel.

关 键 词：铁路隧道 第三系粉细砂岩 工序写实 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]