地铁盾构隧道管片接头刚度影响因素研究

在对我国地铁单线区间盾构隧道衬砌结构及内力统计分析的基础上,引入面-面接触单元和衬垫单元,采用三维有限元手段对盾构隧道管片纵向接头在不同轴力、弯矩、偏心矩、螺栓预紧力、管片尺寸、衬垫厚度和螺栓位置下的接缝端面转角和接头抗弯刚度进行了深入研究,通过-θM关系曲线和三维图形曲线分别揭示和探讨了不同影响因素单独和共同作用下的接缝转角和接头抗弯刚度变化规律。

Study on Factors Influential in Metro Shield Tunnel Segment Joint Bending Stiffness

Based on statistical analysis of currently used lining structures and internal forces of shield tunnels in domestic single-track metro sections, this paper applies the 3D FEM with the face to face contact element and gasket element, to study the effects of different axis forces, moments, eccentric moments, bolt pre-tension forces, segment dimensions, gasket thicknesses and bolt locations on the joint rotary angles and joint bending stiffness of the longitudinal segment joints. Variation laws of joint rotary angles and joint bending stiffness under the of single influence factors are discussed with the relation curves of -M, the interaction laws under the combined action of all influence factors are revealed with the 3D curves.