铁道标准设计2017，Vol.61Issue(11)：100-105,6.DOI:10.13238/j.issn.1004-2954.2017.11.021
含水率对昔格达地层大断面隧道初期支护安全性影响研究
Research on Effect of Moisture Content on Initial Support Safety of Large Cross-section Tunnel in Xigeda Fm Strata
摘要
Abstract
Catastrophic accidents such as initial support structure cracking,rock mass falling out,collapse and roof fall are often caused by insufficient water stability and collapse of Xigeda strata.In order to study the influence of moisture content on the safety of the initial support in Xigeda strata of the tunnel with large cross-section,the stress characteristics and deformation rules of initial supporting structure under five typical surrounding rock water content conditions are compared and analyzed by means of numerical simulation based on the Tongzilin tunnel.According to the deformation standard and safety factors of structural strength stipulated in relevant specifications,the threshold value of the water content of the surrounding rock mass is maintained at 29％.The tunnel support parameters are optimized while the threshold value of the surrounding rock moisture content is exceeded.The reliability and rationality of the numerical simulation results are verified by field monitoring.Research results not only improve the design parameters of the large cross-section tunnel in Xigeda strata,but also provide references for future similar projects.关键词
铁路隧道/昔格达地层/含水率/初期支护/数值模拟/现场监测Key words
Railway tunnel/Xigeda Fm strata/Moisture content/Initial support/Numerical simulation/Field monitoring分类
交通工程引用本文复制引用
王志杰,杨跃..含水率对昔格达地层大断面隧道初期支护安全性影响研究[J].铁道标准设计,2017,61(11):100-105,6.基金项目
国家自然科学基金项目(51678498) （51678498）
