不同围岩级别下连拱隧道中墙的受力分析研究  

Study on the stress of mid-partition of double-arched tunnel in different types of surrounding rock

作　　者：张坤鹏[1] 闫有喜[1] 杨海巍 韦小惠 ZHANG Kunpeng;YAN Youxi;YANG Haiwei;WEI Xiaohui(Qinzhou University, college of architectural engineering, Qinzhou Guangxi 535011, China)

机构地区：[1]钦州学院建筑工程学院,广西钦州535011

出　　处：《钦州学院学报》2018年第3期34-39,共6页Journal of Qinzhou University

基　　金：钦州市结构健康监测工程技术研究中心(钦州学院):综合加固方式下结构主要受力构件的优化效果研究(2017ZRKT09);钦州学院引进高层次人才科研启动项目:土质隧道洞口段围岩应力场分布与结构优化技术研究(2017KYQD131)

摘　　要：依据《公路隧道设计规范》中对各级围岩物理参数的规定,选定六类围岩的典型物理数值,以此作为模型中计算的参数。采用有限元分析计算双连拱隧道中墙在六类围岩下不同开挖步的变形,强度以及稳定性的影响。研究结果表明,连拱隧道的中墙在非对称开挖时其变形、受力及稳定性均明显劣于对称开挖。对称开挖时,隧道中墙在Ⅳ类围岩所承受的压力最大。不对称开挖时,Ⅰ~Ⅵ类围岩随着围岩物理性质的弱化,中墙的变形也随之增加,受力趋于复杂,同时为保证稳定性,中墙的脚趾必须要保留足够的长度,以防止倾覆。Based on the physical parameter in the Specifications for Design of Highway Tunnels at various levels determine six typical physical parameters of surrounding rock. Double-arch tunnel is obtained by using the finite element analysis of middle wall in six types, the deformation of surround ing rock under different excavation steps the influence of strength and stability. The results show that the wall in double-arched tunnel in asymmetric excavation when the deformation , stress and stability are inferior to symmetrical excavation. The middle wall of tunnel the surrounding rock stress is the largest in the class of IV ,when it is symmetrical excavation. Asymmetric excavation , Ⅰ～Ⅵ class surrounding rock, as the attenuation of the physical properties of surrounding rock , deformation of the middle wall is going big , force tend to be more complex , at the same time in order to ensure the stability of the wall toe must keep enough length.

关 键 词：连拱隧道 中墙 开挖步 模型计算 受力分析 

分 类 号：U455.41[建筑科学—桥梁与隧道工程]