基于子模型法的盾构隧道纵向接头地震力学特性研究  

Study on Earthquake Behavior Characteristics of Longitudinal Joint of Shield Tunnel Based on Submodeling Method

作　　者：耿萍[1] 郭翔宇[1] 王琦[1] 廖峻斌 何川[1] 张艳阳 GENG Ping;GUO Xiangyu;WANG Qi;LIAO Junbin;HE Chuan;ZHANG Yanyang(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;China Construction Yipin Investment&Development Co.,Ltd.,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 [2]中建壹品投资发展有限公司,四川成都610031

出　　处：《铁道学报》2022年第2期117-125,共9页Journal of the China Railway Society

基　　金：国家重点研发计划(2016YFC0802200);四川省科技计划(20186120360);国家自然科学基金(51878566)。

摘　　要：为明确盾构隧道纵向接头在地震荷载下的受力特征,采用子模型法建立基于实际工程的接头细化模型,研究地震动不同激励方向下纵向接头的细部受力变形特征,并以破坏试验的方式对数值结果进行验证。数值及试验结果显示:地震动沿隧道纵向及横向激励时,两种工况的受拉危险区受力特征相同,均在手孔、接缝面及套筒周边出现最大主应力集中区,套筒周边出现最大主应力极值,且纵向激励作用下接头受力更加危险;破坏试验中,当管片结构破坏时,螺栓未屈服,最大破坏区域出现在套筒周边邻近外表面的接缝面处,手孔区域有轻微裂纹产生;内外表面混凝土应变相对较小,手孔侧内表面出现较大压应变,套筒侧外表面出现较大拉应变。研究结果为进一步揭示盾构隧道纵向接头受力特征及隧道震害形式提供参考和借鉴。In order to clarify the stress characteristics of longitudinal joint of shield tunnel under earthquake,the submodel method is used to set up the joint refinement model based on actual engineering.Detailed deformation characteristics of longitudinal joint under different excitation directions are studied,and then the failure test is conducted to verify numerical results.The results of numerical and failure test show that when the seismic load is excited along the longitudinal and transverse directions of the tunnel,the stress characteristics of the tension risk area in the two working conditions are the same.The maximum principal stress concentration region of both tow conditions appears in the hand hole,the longitudinal joint surface and around the sleeve.The maximum principal stress extreme value appears around the sleeve,and the joint is more dangerous under longitudinal excitation.In the failure test,when the segment structure is broken,the bolt is not yet yielded,and the largest failure region appears on the joint surface adjacent to the outer surface of the segment,with slight crack occurs in the area of the hand hole.The concrete strain on the inner and outer surfaces is relatively small,and the internal surface on the hand hole side has a large compressive strain,while the outer surface of the sleeve side has a large tensile strain.The research results provide reference and learning for further revealing the stress characteristics of the longitudinal joint as well as the damage form of shield tunnel.

关 键 词：盾构隧道 纵向接头 地震 力学特征 子模型 破坏试验 

分 类 号：U45[建筑科学—桥梁与隧道工程]