不同边界条件对异形盾构管片接头力学性能的影响研究

为提升管片的承载和抗变形能力,对不同边界条件下的异形盾构管片接头力学性能进行研究。基于有限元方法对比简支梁式和钢蝴蝶式2种加载试验条件下的接头受力-形变特征，建立接头试验与整环试验之间关于接头转动刚度的关联性转化公式。研究得出： 1）不同试验状态下接头形变增量与荷载增加的响应一致，钢蝴蝶式加载方法因未考虑重力，其接头形变量值相对较大； 2）简支梁式和钢蝴蝶式接头转动刚度比随覆土厚度的增加分别呈二次函数减、增的变化趋势； 3）由于试验构件尺寸未满足细长梁的要求，构件理论最大挠度在应用时存在不适应性。

Influence of Different Boundary Conditions on MechanicalProperties of Special Shaped Shield Segment Joint

Investigating the influence of different loading boundary conditions on the mechanical properties of special shaped shield tunnel joints is necessary to improve the bearing capability and deformation resistance of tunnel segments. The stress deformation characteristics of a segmental joint under two loading conditions of the simply supported beam and steel butterfly type are compared using the finite element method. Further, the correlation transformation formula of joint rotational stiffnesses obtained from joint loading and full ring tests is established. The following conclusions are drawn: (1) Joint deformation increases with an increase in external load in all testing conditions, and the joint deformation derived from the steel butterfly type loading method is larger than that from the simply supported beam method due to its disregard of the testing specimen′s self weight in steel butterfly type. (2) The joint rotational stiffness ratios under the simply supported beam and steel butterfly type loading conditions show a quadratic functional increase and decrease, respectively, as the burial depth increase. (3) The theoretical calculation of the joint′s maximum deflection is not adaptive during its application because the testing specimens are not thin beams.