考虑隧底隆起斜坡段浅埋隧道稳定性上限分析
Stability analysis on shallow tunnel with floor lift under inclined ground by upper bound method
罗伟 1赵炼恒 2李亮 2陈静瑜 1唐高朋2
作者信息
- 1. 华东交通大学轨道交通学院，南昌330013; 中南大学土木工程学院，长沙410075
- 2. 中南大学土木工程学院，长沙410075
- 折叠
摘要
采用极限分析上限法，基于内外能耗守恒原理，通过构建考虑隧底隆起的斜坡地段浅埋隧道破坏模式，推导出围岩压力的计算式，并通过典型算例重点分析了典型因素对隧道围岩稳定性的影响。研究结果表明：基于泰沙基极限平衡法进行隧道围岩支护设计较为保守，不考虑隧底隆起的极限分析方法次之考虑隧底隆起极限分析方法的风险最大；斜坡地表倾角增大对浅埋隧道稳定性有着不可忽视的不利影响；围岩压力随岩土侧压力系数减小、埋深增大、断面尺寸加大而增大；岩土黏聚力增大、内摩擦角增大对提高浅埋隧道围岩稳定性有积极作用。
Abstract
On the basis of the energy conservation principle between internal and external work ,failure mode of shallow tunnel under inclined ground was established and the expression of surrounding rock pressure was drawn using the limit analysis upper bound method .The correlation factors was analyzed by the computation examples . This results showed that due to the conservative design on Terzaghi limiting equilibrium method of rock support system in tunnelling ,the limit analysis method without considering floor lift is medium ,while considering floor lift had the greatest risk .The increase in inclination angle of slope surface had adverse effect on the shallow tunnel stability and the surrounding rock pressure increased with the reduce of geotechnical lateral pressure coefficient ,or the increase of the buried depth and tunnel diameterLarger geotechnical cohesion force and friction angle were beneficial to improve the tunnel stability .
关键词
浅埋隧道/围岩压力/极限分析上限法/破坏模式/隧底隆起/倾斜地表Key words
shallow tunnel/surrounding rock pressure/limit analysis upper bound method/failure mode/floor lift of tunnel/inclined ground引用本文复制引用
基金项目
中南大学研究生自主探索创新基金(2013zzts048)
国家自然科学基金(51078359)
国家自然科学基金(51208522)
出版年
2015
NETL
NSTL
维普
万方数据