Deformation and Internal Force Response of Shield Tunnel Structure Induced by Erosion Void in Underlying Soil

被引：0
|
作者：
Zheng G. [1 ]
Qiu H. [1 ]
Zhang T. [1 ]
Wang J. [1 ]
机构：
[1] School of Civil Engineering, Tianjin University, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 05期
基金：
中国国家自然科学基金;
关键词：
deformation; erosion void; internal force response; shield tunnel; underlying sandy soil;
D O I：
10.11784/tdxbz202111029
中图分类号：
学科分类号：
摘要：
When the leakage occurs at the tunnel bottom，an erosion void will develop in the underlying sandy soil. From the perspective of the tunnel load，this is the most unfavorable case for the tunnel structure. To investigate the effect of erosion void development direction on the tunnel structure deformation and internal force，two typical cases，longitudinal and horizontal developments，were selected，and a three-dimensional finite element numerical simulation of seepage-stress coupling was performed considering the coupling interaction of the soil seepage field，soil stress field，and tunnel structure. A refined-shield tunnel structure model was established to simulate tunnel deformation，including settlement，dislocation，opening，and segment concrete plastic strain. The difference in the tunnel structure deformation mode for different erosion void development directions was revealed，and the reason for this difference was explained combined with the earth pressure distribution surrounding the tunnel. The results show that when an erosion void develops longitudinally with a constant horizontal size，the resulting tunnel settlement，dislocation，and opening change gradually along the tunnel’s longitudinal direction，i.e.，the tunnel structure shows good deformation coordination. However，compared with the case where the erosion void develops longitudinally when the erosion void develops horizontally along the interface between clay and sand，the tunnel deformation is abrupt at the longitudinal edge of the void，and there is a large dislocation at circumferential joints. © 2023 Tianjin University. All rights reserved.
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页码：494 / 502
页数：8
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