上海交通大学学报

上海交通大学学报 ›› 2025, Vol. 59 ›› Issue (4): 503-512.doi: 10.16183/j.cnki.jsjtu.2023.322

• 船舶海洋与建筑工程 • 上一篇    下一篇

考虑自重应力的隧道周围土体非线性固结特性分析

胡安峰1,2, 陈俞超1, 肖志荣3(), 谢森林1, 龚昭祺4   

  1. 1.浙江大学 滨海和城市岩土工程研究中心,杭州 310058
    2.浙江大学 平衡建筑研究中心,杭州 310058
    3.浙江科技学院 土木与建筑工程学院,杭州 310023
    4.浙江省建筑设计研究院,杭州 310006
  • 收稿日期:2023-07-17 修回日期:2023-10-09 接受日期:2023-10-12 出版日期:2025-04-28 发布日期:2025-05-09
  • 通讯作者: 肖志荣 E-mail:100106@zust.edu.cn
  • 作者简介:胡安峰(1974—),教授,博士生导师,从事桩基工程、软黏土力学及深度学习理论在岩土工程中应用的研究.
  • 基金资助:
    国家自然科学基金(51978612)

Analysis of Nonlinear Consolidation Characteristics of Soil Around Tunnels Considering Self-Gravity Stress

HU Anfeng1,2, CHEN Yuchao1, XIAO Zhirong3(), XIE Senlin1, GONG Zhaoqi4   

  1. 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
    2. Center for Balance Architecture, Zhejiang University, Hangzhou 310058, China
    3. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China
    4. Zhejiang Province Architectural Design and Research Institute, Hangzhou 310006, China
  • Received:2023-07-17 Revised:2023-10-09 Accepted:2023-10-12 Online:2025-04-28 Published:2025-05-09
  • Contact: XIAO Zhirong E-mail:100106@zust.edu.cn

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摘要：

考虑隧道周围土体自重应力,建立饱和土体二维非线性固结控制方程,使用交替隐式差分法对方程进行求解.通过将退化解与已有解析解比较,以及将计算结果与工程实测数据对比,验证了解答的正确性.在此基础上,进一步探究了土体自重应力及固结系数变化对隧道周围土体非线性固结特性的影响规律.结果表明:忽略土体自重应力不仅会导致土层的超静孔压偏大,固结沉降速率偏小,还会使地表沉降终值偏小;在自重应力影响下,压缩指数与渗透指数之比Cc/Ck越小,土体固结沉降速率越慢,但地表沉降终值不会改变;当Cc/Ck=1.0时,土体重度越小,其固结速率受初始有效应力分布形式的影响越大,同时地表沉降终值也越大;Cc/Ck >1.0时渗透系数在固结过程中起主导作用,固结速率随重度增大而减小,而Cc/Ck <1.0时体积压缩系数的影响效果增强,固结速率变为随重度增大而增大,但两种情形下的地表沉降终值均随土体重度增大而减小.

关键词: 隧道, 非线性固结, 有限差分法, 自重应力, 固结系数

Abstract:

Considering the self-gravity stress of the soil around the tunnel, a two-dimensional nonlinear consolidation control equation for saturated soil was established, and solved using the alternating implicit difference method. The correctness of the solution was verified by comparing the degenerate solution with an existing analytical solution, and by comparing the calculated results with measured data. On this basis, the influence of changes in soil self-gravity stress and consolidation coefficient on the nonlinear consolidation characteristics of the soil around the tunnel was further explored. The results indicate that neglecting the self-gravity stress of the soil leads to a higher excess pore pressure and a lower rate of consolidation settlement, and leads to a lower final surface settlement. Under the influence of self-gravity stress, a smaller ratio of compression index to permeability index Cc/Ck results in a slower consolidation settlement rate of the soil, but does not affect the final surface settlement. When Cc/Ck=1.0, a smaller soil self-gravity results in a greater influence of the initial effective stress distribution on the consolidation rate and a higher final surface settlement. When Cc/Ck>1.0, the permeability coefficient plays a dominant role in the consolidation process, and the consolidation rate decreases as the gravity increases. In contrast, when Cc/Ck<1.0, the volume compression coefficient becomes more influential, and the consolidation rate increases with the increase of gravity, though the final surface settlement in both cases decreases with increasing gravity.

Key words: tunnel, nonlinear consolidation, finite difference method, self-gravity stress, coefficient of consolidation

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