膨胀岩土地层盾构隧道结构力学行为研究

摘要

文章在提出膨胀接触压力概念的基础上,采用接触单元对膨胀接触压力和膨胀力的关系进行了研究,得出了膨胀接触压力与膨胀岩土分布、厚度、结构及地层刚度等的关系；同时对膨胀岩土地层中盾构隧道“荷载-结构”模式外荷载及“梁-弹簧”模型的特点进行了分析；并将其分析结果直接应用到成都地铁2号线膨胀岩土地层盾构隧道的结构分析中,得出了盾构隧道在不同膨胀岩土层、膨胀力、埋深和拼装方式条件下的结构内力值,对隧道结构设计起到了指导作用.%This paper put forward the concept of swelling contact pressure, studied the relation between swelling contact pressure and swelling force by using contact element, defined the relation between swelling contact pressure and the distribution, thickness, structure and stratum stiffness of swelling rock, and analyzed the load beside that of "load-structure" mode and the characters of "beam-spring" model of shield tunnel in the swelling rock and soil strata. The above results have been successfully applied to the design of shield tunnel in the swelling rock and soil strata of Chengdu metro Line 2, and can be directly used for reference by similar projects in Chengdu as well as in China.