摘要
采用大比例(1∶20)物理相似模型试验和数值计算,模拟了在Ⅳ、Ⅴ级围岩中净距6 m、坡率为1∶1的小净距隧道开挖过程,研究了初期支护状态下偏压小净距隧道的地中位移、洞周位移增量、围岩压力规律,对比分析了不同围岩组合对小净距隧道安全稳定性的影响;得出了不同围岩情况下偏压隧道的基本力学特性,优化了隧道开挖顺序,为小净距偏压隧道优化设计和施工提供了科学依据。
Authors studied the excavation process of small-spaced twin tunnels in rocks grade Ⅳ and Ⅴwith 30 m overburden and 1 ： 1 surface slope by using large-scale（1 ： 20） physical analogous material model and numerical simulation,obtained the displacements in surrounding rocks,incremental displacements around the tunnel,pressures in surrounding rocks with primary support system.Comparative analyses were carried out to study the effect of different surrounding rock compositions on the basic mechanical characteristics and the safety and stability of twin tunnels with the optimized excavation sequence of tunnels acquired.Results of the study provided scientific basis for the design and construction of uneven pressured twin tunnels with small spacing.
出处
《现代隧道技术》
EI
北大核心
2010年第4期20-26,共7页
Modern Tunnelling Technology
基金
浙江省黄衢南小净距隧道关键技术及工程对策项目研究实施性方案
关键词
小净距隧道
偏压地层
模型试验
数值计算
Twin tunnels with small spacing
Uneven pressure
Hetergeneous
Model experiment
Numerical simulation
