Load-carrying capability of shield tunnel damaged by shield shell squeezing action during construction

被引：34

作者：

Jin, Hao ^{[1
]}

Yu, Kaiwen ^{[2
]}

Gong, Quanmei ^{[1
]}

Zhou, Shunhua ^{[1
]}

机构：

[1] Tongji Univ, Key Lab Rd & Traff Engn, Minist Educ, Shanghai, Peoples R China

[2] SGIDI Engn Consulting Grp Co Ltd, Shanghai, Peoples R China

来源：

THIN-WALLED STRUCTURES | 2018年 / 132卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Shield tunnel; Tunnel construction; Shield shell squeezing action; Segment damage; Bearing capability; MODEL;

D O I：

10.1016/j.tws.2018.07.057

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

A shield tunnel could become squeezed and damaged by shield shell such as in the case of shield tunnel floating. This would affect the load-carrying capability of the shield tunnel. To analyze this problem, a detailed 3D finite element model was developed, which takes into consideration the squeezing action of the shield shell, earth pressure, jacking force, and grouting pressure. The results show that the bending moment and shear force of the damaged tunnel are smaller than those of the undamaged tunnel while the opposite is true for the axial force. In some cases, the bending moment at the top of the damaged shield tunnel changes from positive to negative, which may result in severe leakage. Therefore, shield shell squeezing action causes the load-carrying capacity of the shield tunnel to decrease. Consequently, shield shell squeezing action should be avoided in order to ensure the safe service of the shield tunnel.

引用

页码：69 / 78

页数：10

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