湖南大学学报（自然科学版）Issue(9)：104-109,6.
基于强度折减和上限有限元的椭圆形毛洞隧道围岩稳定性分析∗
Finite Element Upper Bound Analysis of Stability of Unlined Elliptical Tunnel Based on Strength Reduction Method
摘要
Abstract
To study the unlined elliptical tunnel stability,strength reduction method was introduced in-to the finite element upper bound method.The relations between safety factor and influence factors such as shear strength parameters,buried depth and span were studied with self-made program.Meanwhile,the failure modes were also explored for limit states derived from strength reduction method.The results show that strength reduction method can be easily embedded into finite element upper bound method.The rela-tion curves have shown a positive correlation between rock safety factors and shear strength parameters, while rock safety factors have negative correlations with buried depth and span.The influence of the tunnel span on the safety factor is obvious,and the reduction in rock safety factors has been found to vary approx-imately in a range of 27%~46% when the ratio of tunnel span and height (B/D )increases from 0.5 to 2.0.The failure modes with distinct characteristics reveal that the main slip surface starts from the bottom or the side wall of the tunnels and then extends up to the ground surface.The slip lines are mainly focused on the top of the tunnel arch and side wall.Meanwhile,horizontal extents of the damage area are less than 1.5 times of tunnel height.关键词
毛洞隧道/上限有限元/运动单元/强度折减/非线性规划/破坏模式Key words
unlined tunnel/finite element upper bound method/rigid translator moving element/strength reduction/nonlinear programming/failure mechanism分类
建筑与水利引用本文复制引用
康石磊,杨峰,张箭,阳军生..基于强度折减和上限有限元的椭圆形毛洞隧道围岩稳定性分析∗[J].湖南大学学报（自然科学版）,2015,(9):104-109,6.基金项目
国家自然科学基金资助项目(51008309),National Natural Science Foundation of China(51008309) （51008309）
