软土基坑开挖诱发邻近小曲率半径隧道变形时效分析

    张治国

    张治国. 软土基坑开挖诱发邻近小曲率半径隧道变形时效分析[J]. 岩土工程学报. DOI: 10.11779/CJGE20240469
    引用本文: 张治国. 软土基坑开挖诱发邻近小曲率半径隧道变形时效分析[J]. 岩土工程学报. DOI: 10.11779/CJGE20240469
    Time-dependent analysis of deformation induced by soft soil pit excavation adjacent to small curvature radius tunnels[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20240469
    Citation: Time-dependent analysis of deformation induced by soft soil pit excavation adjacent to small curvature radius tunnels[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20240469

    软土基坑开挖诱发邻近小曲率半径隧道变形时效分析  English Version

    基金项目: 国家自然科学基金资助项目(No.52478402,No.42177145);城市基础设施智能化浙江省工程研究中心课题(IUI2022-YB-01);上海市浦东新区建设(集团)有限公司技术课题();

    Time-dependent analysis of deformation induced by soft soil pit excavation adjacent to small curvature radius tunnels

    • 摘要: 目前针对软土基坑开挖诱发邻近小曲率半径隧道变形的理论研究一般将地基视为线弹性体,未考虑土体流变特性的影响,且较少分析曲型隧道变形的特性,因此无法准确预测时间效应下基坑开挖对既有小曲率半径隧道变形的影响。首先,建立分数阶Merchant黏弹性软土基坑开挖诱发邻近既有小曲率半径隧道变形力学模型,按照Laplace时域变化特性推导出分数阶黏弹性土体Laplace域参数;其次,基于基坑卸载和Mindlin应力解理论,求解出邻近既有小曲率半径隧道上附加应力场,再根据Pasternak地基和Timoshenko梁理论,通过有限差分法和Laplace正逆变换推导出既有小曲率半径隧道径向和竖向变形时域解;最后,将工程实测数据及三维数值模拟结果与解析解进行对比验证,得到了较好的一致性。
      Abstract: Current theoretical studies on deformation induced by excavation of foundation pits in soft soils in adjacent small curvature radius tunnels generally consider the foundation as a linear elastic body, which does not take the influence of the rheological property of soil body into account. Meanwhile, the deformation characteristics of curved tunnels are less analyzed, thus it is not possible to accurately predict the impact of foundation pit excavation on the deformation of existing tunnels with small curvature radius under the time effect. Firstly, a mechanical model of deformation induced by excavation of a soft soil pit with fractional order Merchant viscoelasticity adjacent to a small curvature radius tunnel is developed. The Laplace domain parameters of the fractional order viscoelastic soil are further derived according to the Laplace time-domain variability properties. Secondly, the additional stress field on the adjacent existing small curvature radius tunnels is solved based on foundation pit unloading and Mindlin stress solution theory. The time domain solutions for radial and vertical deformation of the existing small curvature radius tunnels are then derived by finite difference method and Laplace positive and inverse transformations based on Pasternak foundation and Timoshenko beam theory. Finally, the engineering measured data and three-dimensional numerical simulation results are compared with the analytical solution to verify relatively accuracy.
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    出版历程
    • 收稿日期:  2024-05-14
    • 网络出版日期:  2024-12-23

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