Above-crossing tunneling effects on existing twin tunnels in soft clay with an anisotropic egg-shaped elastoplastic model

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-06-18 DOI:10.1016/j.tust.2025.106817

Luying Ju , Xinying Fang , Jianfeng Zhu , Yanli Tao , Riqing Xu

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引用次数: 0

Abstract

This study investigates the impact of inherent soil anisotropy on the mechanical response of existing twin tunnels under the effect of above-crossing twin tunneling in soft clay regions, using the anisotropic egg-shaped elastoplastic (AESE) constitutive model and ABAQUS for three-dimensional numerical simulations. The model evaluates the displacement, axial force, bending moment, and shear force distributions of existing twin tunnels after two overcrossing events. Validated with field data, results show a strong correlation between soil anisotropy and maximum heave of the existing tunnels. An empirical model is developed for the relationship between axial force and soil anisotropy. The findings suggest that when the soil anisotropic tensor exceeds 0.4, tensile stress may develop at the tunnel crown, and slight changes in anisotropy lead to significant variations in bending moments and shear forces, especially at the tunnel side walls. However, the degree of inherent soil anisotropy has a greater impact on tunnel deformation than on the bearing capacity of the tunnel bending structure. This research offers a refined framework for predicting twin tunnel behavior during overcrossing construction, with implications for urban subway system design.

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基于各向异性蛋形弹塑性模型的软土既有双隧道跨上掘进效应研究

采用各向异性蛋形弹塑性（AESE）本构模型和ABAQUS软件进行三维数值模拟，研究了软粘土区上跨双隧道开挖作用下既有双隧道固有土体各向异性对隧道力学响应的影响。该模型评估了现有双隧道在两次跨越事件后的位移、轴力、弯矩和剪力分布。结果表明，土的各向异性与既有隧道的最大隆起有较强的相关性。建立了轴向力与土体各向异性关系的经验模型。结果表明，当土体各向异性张量大于0.4时，隧道顶部可能产生拉应力，各向异性的微小变化导致弯矩和剪力的显著变化，尤其是隧道侧壁。但土体固有各向异性程度对隧道变形的影响大于对隧道弯曲结构承载力的影响。本研究提供了一个精细化的框架来预测双线隧道在立交桥施工过程中的行为，对城市地铁系统设计具有指导意义。

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

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.