盾构隧道纵向接头局部足尺试验研究  

Feasibility study on local full-scale experiment’s boundary of longitudinal joint of shield tunnel

作　　者：耿萍[1] 郭翔宇[1] 王琦[1] 唐睿[1] 陈昌健[1] 何川[1] 张艳阳 Geng Ping;Guo Xiangyu;Wang Qi;Tang Rui;Chen Changjian;He Chuan;Zhang Yanyang(Key Laboratory for Transportation Tunnel Engineering of the 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

出　　处：《土木工程学报》2020年第1期92-101,128,共11页China Civil Engineering Journal

基　　金：国家重点研究发展计划(2016YFC0802201);国家自然科学基金(51878566,51578457);四川省科技重点研发项目(2018GZ0360);四川省科技计划(2019YFG0001);中国博士后科学基金(2017M623056)

摘　　要：沿盾构隧道纵向,管片环与管片环之间的接头称之为纵向接头。纵向接头是变形的薄弱部位,在变形过程中受到相邻管片的约束,其受力特点与管片接头不同。文章首先采用数值模拟方法,研究纵向接头局部试验的可行性,然后开展纵向接头局部足尺试验,研究接头的受力变形特征,所得结论如下:对纵向接头进行分析时,对比整环模型及纵向等效刚度梁模型计算结果,两者接头张开量、螺栓应力相差在11%以内,管片结构塑性损伤区分布特征基本一致,故纵向等效刚度梁模型可作为纵向接头局部足尺试验的依据;纵向接头局部足尺试验时,纵向接头张开量的变化对轴力更加敏感,螺栓应变增长与环间力(轴力、弯矩)的增加基本保持一致。接缝转角在环间拉力下趋近于0,且追随环间弯矩的变化;各工况中构件表面混凝土最大拉应变出现在套筒侧管片外表面中部,最大压变出现在手孔侧管片的内表面。破坏试验中,纵向拉力323.2kN时管片结构先于螺栓破坏,此时螺栓未达屈服强度。Along the longitudinal direction of the shield tunnel,the joint between the two segment rings is called the longitudinal joint.The longitudinal joint is the weak part of the deformation restrained by the adjacent segments during the deformation process,and its mechanical characteristics are different from those of the segment joint.In this work,the feasibility of local test of longitudinal joints was studied by numerical simulation.Then,the full-scale tests on longitudinal joints were carried out to study the deformation characteristics of the joints.The conclusions are summarized as follows:when analyzing longitudinal joints and comparing the results calculated by the whole ring model and the longitudinal equivalent stiffness beam model,the differences in the results of joint opening amount and bolt stress are within 11%,and the distribution characteristics of the plastic damage zone of the segment structure are basically the same,so that the longitudinal equivalent stiffness beam model can be used for local full-scale test of the longitudinal joint.According to the local full-scale test,the change of the opening amount of the longitudinal joint is more sensitive to the axial force,and the bolt strain growth is basically consistent with the increase of the ring force(axial force,bending moment).The seam angle is close to 0 under the circumferential tension and follows the change of the circumferential bending moment.In each working condition,the maximum tensile strain of the surface layer concrete of the component appears on the middle of the outer surface of the sleeve side segment,and the maximum compressive strain occurs on the inner surface of segments at the hand hole side.In the failure test,when the longitudinal tensile force is 323.2 kN,the segment structure fails before the bolt,and the bolt does not reach its yield strength.

关 键 词：盾构隧道 纵向接头 纵向等效刚度梁模型 整环模型 局部足尺试验 

分 类 号：U45[建筑科学—桥梁与隧道工程]