摘要
针对毛洞隧道稳定性问题,利用自编刚体平动运动单元上限有限元程序进行计算分析,获得了失稳临界系数γD/c的上限解图表及相应的刚性运动块体破坏模式。结果表明:(1)失稳临界系数γD/c随土体内摩擦角ф的增大而增大,随隧道埋深与直径比H/D的增加而减小;不过,H/D对γD/c的影响并不显著,特别是对于内摩擦角较大的情况。(2)刚体平动运动单元上限有限元所得隧道刚性运动块体破坏模式大致具有两组交叉滑动面的特征;随着土体内摩擦角ф增大,隧道横向破坏范围明显收缩,刚性块体间的相互错动更加显著;H/D对破坏模式的形态影响不明显,当H/D增大时,隧道横向的破坏范围增加。
For stability of unlined tunnel,a self-compiled program of FE upper bound method with rigid translatory moving elements is used for analysis. The upper bound solution chart of unstable critical coefficient γD/c and corresponding rigid block failure mode a re thus obtained. The result shows that（ 1）Unstable critical coefficient γD/c increases with the increment of soil internal friction angle ф,while it decreases with the increasing of ratio of depth to diameter H/D. However,the effect of C/D on γD/c is not significantly,particularly when internal friction angle is larger.（ 2） The failure mode of rigid moving blocks obtained by finite element upper bound method with rigid translatory moving elements presents 2 sets of sliding planes. With the increasing of soil internal friction angle ф,tunnel horizontal failure zone obviously shrinks,the sliding of rigid blocks manifest significantly.（ 3） With the increases of H/D,tunnel horizontal failure zone extends.
出处
《公路交通科技》
CAS
CSCD
北大核心
2015年第12期108-113,共6页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51008309)
关键词
隧道工程
毛洞隧道
上限有限元
刚体平动运动单元
失稳临界系数
破坏模式
tunnel engineering
unlined tunnel
finite element upper bound
rigid translatory moving element
unstable critical coefficient
failure mode
