考虑接头正接触非线性的盾构隧道管片接头力学模型研究  

Study on mechanical model of segment joint considering joint normal contact nonlinearity

作　　者：陈枰良 耿萍[1] 陈昌健[1] 杨琪[1] 何川[1] Chen Pingliang;Geng Ping;Chen Changjian;Yang Qi;He Chuan(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《土木工程学报》2021年第5期87-97,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(51878566);国家重点研发计划(2016YFC0802201);四川省重点研发项目(2020YFS0294)。

摘　　要：因盾构隧道接头传力具有显著的接触非线性,接头力学分析一直是盾构隧道结构分析的难点。文章针对盾构隧道管片接头在轴力和弯矩作用下的非线性变形问题,提出一种新的接头力学分析思路,通过引入刚性面假定、基于位移的接头力学建模方法、反平方根滤值函数,建立管片接头正接触非线性力学模型。研究发现:接头具有多种接触状态,反平方根滤值函数可以有效的反映接头正接触非线性;管片接头力学性能可由管片混凝土和螺栓力学性能两部分描述,其中管片混凝土变形能力与位移偏心距有关,螺栓变形能力主要与预紧力有关;从狮子洋和南京长江盾构隧道的试验数据对比来看,接头正接触非线性力学模型是合理的,接头力学模型性能与接头试验结果基本吻合。Because of the significant contact nonlinearity of the joint in shield tunnel,the mechanical analysis of joint has been one difficulty in the structural analysis of shield tunnel.In this paper,the nonlinear deformation of segment joints under the actions of axial force and bending moment is studied,and a new idea of joint mechanical analysis is put forward.By introducing the rigid surface assumption,displacement-based mechanical modeling method of joint and inverse square root filtration function,the normal contact nonlinear mechanical model of joint is established.The results show that:there are several contact states in the joint,and the inverse square root filter function can effectively reflect the normal contact nonlinearity.The mechanical properties of segment joints can be described in the two parts of segment concrete and bolt.The deformation properties of segment concrete are related to displacement eccentricity,and the bolt are related to pretightening force.According to the comparison of the test data of Shiziyang Shield Tunnel and Nanjing Yangtze River Shield Tunnel,The nonlinear joint mechanical model established in this paper is reasonable,and it is consistent with the joint test results.

关 键 词：盾构隧道 管片接头 力学模型 力学性能 

分 类 号：U45[建筑科学—桥梁与隧道工程]