Influence of lateral pressure loss on the force and deformation of shield tunnel in soft soil area

被引：0

作者：

Liang D. ^{[1
,2
]}

Jin H. ^{[1
,2
]}

Xiao J.-H. ^{[1
,2
]}

Zhou S.-H. ^{[1
,2
]}

机构：

[1] Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai

[2] Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai

来源：

Gongcheng Lixue/Engineering Mechanics | 2019年 / 36卷 / 05期

关键词：

Finite element method; Lateral unloading; Model test; Segment thickness; Shield tunnel;

D O I：

10.6052/j.issn.1000-4750.2018.04.0216

中图分类号：

学科分类号：

摘要：

To study the problem that construction activities adjacent to metro tunnels in soft soil area could lead to increasement of segment deformation, a combination approach of model test and finite element simulation is adopted to study the force and deformation of shield tunnel structure at both elastic stage and plastic stage induced by lateral pressure loss. The results showed that: when the lateral pressure loss of shield tunnel is small, the segment deformation increases linearly, shield tunnel structure is still at elastic stage; when the lateral pressure loss becomes large, the segment deformation increases exponentially, and the shield tunnel structure changes into the range of plasticity. Increasing the thickness of segment can effectively improve the anti-deformation capacity of shield tunnel, but the improvement will become less effective with the increasement of segment thickness. From the perspective of structural eccentric loading state, increasing the thickness of segment will change the stress state from small eccentric compressive state into large eccentric compressive state. However, from the perspective of structural stress and strain, the maximum strain of segment will decrease, which makes the shield tunnel structure a more secure state of stress. © 2019, Engineering Mechanics Press. All right reserved.

引用

页码：148 / 156and175

共 17 条

[1] Zhou S., Structural Design and Construction in Urban Mass Transit, (2011)
[2] Chen R., Wang C., Lu L., Et al., Influence of excavation on exist metro shield tunnel and control measures, Engineering Mechanics, 34, 12, pp. 1-13, (2017)
[3] Wen K., Liu S., Yang H., Three- dimensional numerical simulation analysis of the influence of pit excavation based on hardening soil-small strain model on metro tunnel, Engineering Mechanics, 35, 1, pp. 80-87, (2018)
[4] Ge S., Xie D., Ding W., Effects of loading and unloading large-scale area loadacting on soft soil metro line, China Civil Engineering Journal, 44, pp. 127-130, (2011)
[5] Liu J., Hou X., Shield Tunnel, (1991)
[6] Liu X., Zhang H., Lu L., Et al., Experiment of the bearing capacity of shield tunnel in unloading conditions, Underground Engineering and Tunnels, 18, 5, pp. 38-43, (2015)
[7] Liu S., Feng K., He C., Et al., Study on the bending mechanical model of segmental joint in shield tunnel with large cross-section, Engineering Mechanics, 32, 12, pp. 215-224, (2015)
[8] Feng K., He C., Zou Y., Study on the effect of assembling method on the innerforce of segmental lining for cross-river shield tunnel with large cross-section, Engineering Mechanics, 29, 6, pp. 114-124, (2012)
[9] Blom C.B.M., Van Der Horst E.J., Jovanovic P.S., Three-dimensional structural analyses of the shield-driven "Green Heart" tunnel of the high-speed line South, Tunnelling and Underground Space Technology, 14, 2, pp. 217-224, (1999)
[10] Liu X., Liu Z., Ye Y., Et al., Mechanical behavior of quasi-rectangular segmental tunnel linings: Further insights from full-scale ring tests, Tunnelling and Underground Space Technology, 79, pp. 304-318, (2018)

← 1 2 →