Numerical analysis of the impact of excavation for undercrossing Yellow River tunnel on adjacent bridge foundations

IF 5.8 4区工程技术 Q1 MECHANICS

Applied Rheology Pub Date : 2023-01-01 DOI:10.1515/arh-2023-0104

Liangliang Xin, Shuaihua Ye, Dengqun Wang

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Abstract

Abstract Taking the twin-tunnel shield tunnel of the urban rail transit in Lanzhou City as an example, this article applies the hardening soil small criterion and utilizes finite element software to simulate the excavation process of the undercrossing Yellow River tunnel. The analysis focuses on the deformation effects and axial force variations of nearby bridge foundations in three directions: vertical to the tunnel, along the tunnel, and the vertical direction. The simulation results are compared with monitoring data. The findings indicate that shield tunnel construction increases the deformation of bridge foundations in the vertical and tunnel directions, while mitigating the deformation in the vertical direction. The influence is more significant as the distance between the tunnel and the foundations decreases. The redistribution of stress due to soil disturbance causes foundation deformation, and the magnitude of foundation deformation reflects the extent of soil disturbance. The simulated vertical displacement of the pile head is consistent with the trend observed in the field measurements. The simulation results generally align with the conclusion that the tunnel has minimal impact on the soil beyond a distance of 3–5 times the tunnel diameter.

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穿越黄河隧道开挖对邻近桥梁基础影响的数值分析

摘要以兰州市城市轨道交通双隧道盾构隧道为例，应用硬化土小准则，利用有限元软件对穿越黄河隧道的开挖过程进行了模拟。重点分析了附近桥梁基础在垂直于隧道、沿隧道和垂直方向三个方向上的变形效应和轴向力变化。仿真结果与监测数据进行了比较。研究结果表明，盾构隧道施工增加了桥梁基础在竖向和隧道方向上的变形，同时减轻了竖向变形。随着隧道和基础之间距离的减小，这种影响更加显著。土壤扰动引起的应力再分配引起地基变形，地基变形的大小反映了土壤扰动的程度。桩头的模拟垂直位移与现场测量中观察到的趋势一致。模拟结果通常与以下结论一致：隧道对超过隧道直径3-5倍的土壤的影响最小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Rheology 物理-力学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.