小净距偏压公路隧道开挖顺序优化  

Optimization of Excavating Sequence for Closely Spaced Bias Doubletube Tunnels

作　　者：靳晓光[1] 刘伟[1] 郑学贵[1] 丁浩[1] 

机构地区：[1]重庆交通科研设计院,重庆400067

出　　处：《公路交通科技》2005年第8期61-64,共4页Journal of Highway and Transportation Research and Development

摘　　要：小净距偏压隧道合理开挖顺序对隧道围岩稳定和支护措施优化有很大的影响。结合净距4.0m、偏压25°公路隧道工程实践,通过二维、三维弹塑性有限元数值仿真模拟,分析了隧道开挖顺序对围岩破坏接近度、围岩变形位移以及对空间围岩体塑性破坏和位移的影响,得到了先开挖浅埋侧隧道优于先开挖深埋侧隧道的结论,为小净距偏压隧道优化设计和施工提供了科学依据。Reasonable excavating sequence for closely spaced bias double-tube tunnels has important impact on stability of surrounding rock and supports optimization. Based on tunnel engineering practice with clear distance of 4.0m and bias angle of 25 °the influence of excavating sequence on surrounding rock mass were anlysed through 2D and 3D elastic-plastic finite numerical simulation such as surrounding rock damage, deformation displacement of surrounding rock mass, plastic failure and displacement of spatial surrounding rock mass etc, The conclusion had been obtained that excavating shallow tunnel should be given priority rather than excavating deep tunnel.

关 键 词：小净距偏压隧道 开挖顺序 数值仿真 优化 

分 类 号：U451[建筑科学—桥梁与隧道工程]