Experimental study on the compression-shear performance of a new-type circumferential joint of shield tunnel  

作　　者：Ziyang Zhou Kun Feng Yiteng Liu Bohan Wu Chunfang Lu Gang Lin Chuan He 

机构地区：[1]Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China [2]China Academy of Railway Sciences Corporation Limited,Beijing 100081,China [3]China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China

出　　处：《Underground Space》2024年第1期138-155,共18页地下空间（英文）

基　　金：supports of the National Key R&D Program of China(Grant No.2021YFB2600900);National Natural Science Foundation of China(Grant No.52078430);Yunnan Provincial Science and Technology Department of China(Grant No.202002AF080003).

摘　　要：To investigate the compression-shear behavior of a new circumferential joint based on the sleeve-straight bolt combination type connection of large-diameter shield tunnels,a series of full-scale joint experiments was carried out.In the process of the experiment,more attention was paid to the specimen displacement,bolt stress and joint damage mode.On the basis of these experiment phenomena,this study discussed the compression-shear bearing process of the new connector,analyzed the damage mode of the joint structure,and finally evaluated the performance of the new connector.It is found that the bearing process of the joint can be divided into four stages:the transitional stage for overcoming the friction of the concrete,the sleeve bearing stage for the sleeve bearing shear loads alone,the combined bearing stage for bearing shear loads by the connector system,and the structural damage stage for structural instability and damage.Generally speaking,affected by connector position and hand hole,the positive compression-shear stiffness of the joint is less than the negative compression-shear stiffness,and the positive shear strength of the joint is greater than the negative shear strength.The increase of longitudinal axial force will improve the compression-shear performance of the joint.The relationship between longitudinal axial force and joint stiffness is a logarithmic function.The use of new type of connector can effectively improve the compression-shear stiffness of joints under low shear loads,but the application of straight bolts will lose part of the strength performance.

关 键 词：Shield tunnel New type of connector Shear resistance Full-scale experiment Circumferential joint 

分 类 号：U45[建筑科学—桥梁与隧道工程]