摘要
将强度折减法引入静水压力下海底隧道衬砌的安全稳定性研究,利用Flac3d软件建立了海底隧道-岩土体-海水相互作用的强度折减法数值分析模型,对比判定了强度折减法的两种折减方式,考虑海底隧道在静水压力作用下的位移变化、剪应变增量变化和塑性区变化情况,确定了衬砌局部破坏的极限平衡状态和整体破坏的极限平衡状态,分析了海底隧道在静水压力作用下的破坏机理。研究结果表明:海底隧道采用同时折减衬砌和围岩的折减方式进行计算较为合理;衬砌局部破坏的安全系数为1.83,整体破坏的安全系数为2.125,衬砌主要因剪应力产生破坏。
Strength reduction method is introducedinto safety and stability ofsubsea tunnel lining under water load. A numerical model for the strength reduction method subsea tunnel- soil- seawater interaction is established by means of Flac3 dsoftware. Make a contrastof two strength reduction ways. Comprehensive consider the change of displacement and shear strain increment and plasticity states when the subsea tunnel under water load. Make sure thelocal failure and the overall destruction limit state. Analysis subsea tunnel failure mechanism.The simulated results show that the method reduces tunneling surrounding rock and lining is better. The lining local failure limitfactor is 1.83 and the overall destruction safety factor is 2.125.The failure reason of lining is shear stress.
出处
《水利学报》
EI
CSCD
北大核心
2015年第S1期101-106,共6页
Journal of Hydraulic Engineering
基金
国家重点基础研究发展计划973项目(2011CB013600)
国家自然科学基金项目(51378496)
关键词
强度折减法
海底隧道
二次衬砌
安全系数
strength reduction method
subsea tunnel
secondary lining
safety factor
