摘要
针对傍山浅埋隧道开挖过程中隧-坡相互作用机理认识不清晰的问题,提出基于有限元荷载释放原理的隧道-边坡相互作用过程分析方法。该方法通过在计算单元上施加与此处原岩应力大小相等、方向相反的反向应力来实现荷载的逐步释放,从而获得隧道围岩和上覆边坡力学行为的演化过程,避免了常规数值模拟中一次性开挖计算掩盖的岩体力学行为逐步演化过程的不足。通过对我国西南某典型傍山隧道的隧-坡相互作用分析,表明该方法可以为隧道围岩的支护时机、关键部位围岩支护、上覆边坡安全监测等设计优化提供理论支持,对同类工程设计具有借鉴意义。
Aiming at unclear understanding of tunnel-slope interaction mechanisms in the excavation process of shallow tunnel adjacent to mountain,we propose the method of analyzing the interaction process of tunnel-slope based on the principle of finite element load releasing.Through applying reversed stress that equal in magnitude and opposite in direction in the computing unit to realize the slow release of load,the evolution process of mechanical behaviors of tunnel surrounding rock and overlying slope is obtained and the insufficiency that gradual evolution process is covered by one-time excavation computation with conventional numerical simulation is avoided.The analysis on tunnel-slope interaction of a tunnel adjacent to mountain in Southwest China shows that the method can provide theoretical basis for the optimization design of supporting opportunity of tunnel rock,surrounding rock support of key positions and safety monitoring of overlying slope.
出处
《人民长江》
北大核心
2011年第4期43-46,共4页
Yangtze River
关键词
荷载释放
围岩支护
变形扰动率
傍山隧道
load release
surrounding rock support
deformation disturbance rate
tunnel adjacent to mountain
