摘要
文章基于修正惯用法和壳-弹簧模型两种计算方法,研究了原型试验条件下错缝拼装的异形盾构管片随覆土厚度增加的力学行为特征。研究结果表明,异形管片结构整体变形呈"横鸭蛋"形;环向接头存在使结构内力呈非对称分布,纵向接头的剪切作用和幅宽边缘对其加强作用使幅宽边缘内力普遍大于幅宽中央;基于平面应变状态的修正惯用法夸大了错缝拼装对管片纵向的加强作用,计算结果要大于考虑三维空间问题的壳-弹簧模型,说明修正惯用法作为异形管片的设计方法是偏于安全的;建议异形盾构管片横向刚度有效率范围为0.72~0.87,正弯矩区弯矩传递系数范围为0.245~0.256,负弯矩区弯矩传递系数范围为0.166~0.197。
The mechanical characteristics of a staggered jointed specially shaped segmental lining under the prototype loading test with an increasing buried depth were analyzed based on the modified routine method and shellspring model. The results show that the overall deformation of the specially shaped shield lining is just like a ＂lying duck egg＂; the existence of the circumferential joints leads to an asymmetric distribution of the internal force, and the internal force at the segment edge is larger than that in the segment center due to the shearing action of the longitudinal joints with a. strengthened edge. The calculation results of the shell-spring model considering 3D space is larger than dlat of the plane strain-state based modified routine method that exaggerates the reinforcing action of the staggered jointed erection, which indicates the latter is safer for use as the design method for specially shaped segments. The suggested range for the transverse effective rigidity ratio is 0.72-0.87 and the moment transfer coefficient is 0.245-0.256 for the positive moment area and 0. 166-0.197 for negative moment area.
作者
张子新
朱叶艇
朱雁飞
黄昕
ZHANG Zixin;ZHU Yeting;ZHU Yanfei;HUANG Xin(Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092;Department of Geotechnical Engineering,Tongji University,Shanghai 200092;Shanghai Tunnel Engineering Co.Ltd.,Shanghai 200233)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第4期106-113,共8页
Modern Tunnelling Technology
基金
上海市国资委资助重大项目(2013017)
关键词
异形盾构隧道
修正惯用法
壳-弹簧模型
有限元
错缝拼装
正负弯矩
Specially shaped shield tunnel
Modified routine method
Shell-spring model
FEM
Staggered jointed erection
Positive and negative moments
