Effects of disturbance during tunnel construction on dynamic response of tunnel-soil body system during tunnel construction period

被引：0
|
作者：
Su G. [1 ,2 ]
Di H. [1 ,2 ]
Zhou S. [1 ,2 ]
Guo H. [2 ,3 ]
Zhang X. [1 ,2 ]
机构：
[1] Key Laboratory of Road and Traffic Engineering of die Ministry of Education, Tongii University, Shanghai
[2] Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongii University, Shanghai
[3] The Technical Center of Shanghai Shentong Metro Group Co., Ltd., Shanghai
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 15期
关键词：
environmental vibration; perfectly matched layer; saturated soil; soil body stiffness degradation; tunnel construction;
D O I：
10.13465/j.cnki.jvs.2023.15.025
中图分类号：
学科分类号：
摘要：
Subway shield tunnel construction can cause disturbance to foundation soil body, and the generated soil body stiffness degradation can affect vibration response of foundation soil body. Here, to consider effects of near field construction disturbances on dynamic response of tunnel system in later stage, a solving method using the combination of static finite element and 2. 5D dynamic finite element was proposed. Firstly, based on wave equation of saturated soil, a 2. 5D finite element expression was derived for saturated soil in u-p form where u is soil skeleton displacement and u-p is pore water pressure. Combining tensile function, a perfectly matched layer boundary was constructed, and a 2. 5D finite element-perfectly matched layer dynamic model for saturated soil foundation in u-p form was established. Secondly, the static finite element method was used to simulate tunnel construction to determine shear stiffness degradation value of foundation soil body caused by disturbance of shield tunnel construction. Finally, the degraded soil body shear stiffness was substituted into the 2.5D dynamic model to realize analysis of effects of construction disturbances on dynamic response of the system. Based on the proposed method, effects of shield tunnel excavation construction on ground surface vibration response were explored under different foundation soil bodies and tunnel shapes. The results showed that tunnel construction can increase vertical vibration displacements of surface soil body, the closer to tunnel the soil body, the larger the increment of its vertical displacement caused by tunnel construction, the maximum value appears at center line of tunnel; vibration responses under circular and rectangular tunnels are smaller than those under elliptical tunnels. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：210 / 218
页数：8
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