隧道周围饱和软土二维非线性固结分析

doi:10.16183/j.cnki.jsjtu.2022.228

上海交通大学学报 ›› 2023, Vol. 57 ›› Issue (12): 1631-1638.doi: 10.16183/j.cnki.jsjtu.2022.228

所属专题：《上海交通大学学报》2023年“船舶海洋与建筑工程”专题

隧道周围饱和软土二维非线性固结分析

胡安峰¹^,³, 龚昭祺²^,⁴, 肖志荣⁵(), 陈缘¹

1.浙江大学滨海和城市岩土工程研究中心, 杭州 310058
2.浙江省建筑设计研究院, 杭州 310006
3.浙江大学建筑设计研究院有限公司, 杭州 310028
4.浙江大学平衡建筑研究中心, 杭州 310028
5.浙江科技学院土木与建筑工程学院, 杭州 310023

收稿日期:2022-06-21 修回日期:2022-08-01 接受日期:2022-08-16 出版日期:2023-12-28 发布日期:2023-12-29
通讯作者: 肖志荣,女,副教授;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、近海岩土工程及深度学习理论在岩土工程中的应用研究.
基金资助:
国家自然科学基金(51978612)

Two Dimensional Nonlinear Consolidation Analysis of Saturated Soft Soil Around Tunnel

HU Anfeng¹^,³, GONG Zhaoqi²^,⁴, XIAO Zhirong⁵(), CHEN Yuan¹

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. Zhejiang Province Architectural Design and Research Institute, Hangzhou 310006, China
3. Architectural Design and Research Institute of Zhejiang University Co., Ltd., Hangzhou 310028, China
4. Center for Balance Architecture, Zhejiang University, Hangzhou 310028, China
5. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China

Received:2022-06-21 Revised:2022-08-01 Accepted:2022-08-16 Online:2023-12-28 Published:2023-12-29

摘要/Abstract

摘要：

考虑隧道周围软土压缩性和渗透性的非线性变化,建立二维非线性渗流固结控制方程,利用一种交替隐式差分法进行求解,得到隧道完全透水、完全不透水和半透水三种情况下平均固结度随时间的发展规律;通过将退化解与现有解析解进行对比,验证了差分解的正确性.同时,分析了压缩指数C_c和渗透指数C_k对隧道周围软土固结度变化的影响规律.结果表明:隧道透水性是影响固结度发展变化的重要因素;C_c对固结度发展的影响小于C_k;渗流固结会导致隧道周围土体的有效应力场发生变化,平均固结度随着C_k的增大而减小.若不考虑土体非线性,将会对固结度计算产生较大误差.

关键词: 非线性固结, 半透水, 有限差分法, 饱和软土

Abstract:

Considering the nonlinear changes of compressibility and permeability of soft soil around the tunnel, a two-dimensional nonlinear seepage consolidation control equation is established, which is solved by an alternating implicit difference method, and the development law of the average degree of consolidation with time under the three conditions of complete permeability, complete impermeability, and semi permeability of the tunnel is obtained. By comparing the degenerate solution with the existing analytical solution, the correctness of the difference solution is verified. In addition, the effects of compression index C_c and permeability index C_k on the consolidation degree of soft soil around the tunnel are analyzed. The results show that the permeability of tunnel is an important factor affecting the development and change of consolidation degree. The influence of compression index C_c on the development of degree of consolidation is less than that of permeability index C_k. Seepage consolidation will change the effective stress field of the soil around the tunnel, and the average degree of consolidation decreases with the increase of permeability index C_k. If the nonlinearity of soil is not considered, there will be a large error in the calculation of degree of consolidation.

Key words: nonlinear consolidation, semi-permeability, finite difference, saturated soft soil

中图分类号:

TU443

胡安峰, 龚昭祺, 肖志荣, 陈缘. 隧道周围饱和软土二维非线性固结分析[J]. 上海交通大学学报, 2023, 57(12): 1631-1638.

HU Anfeng, GONG Zhaoqi, XIAO Zhirong, CHEN Yuan. Two Dimensional Nonlinear Consolidation Analysis of Saturated Soft Soil Around Tunnel[J]. Journal of Shanghai Jiao Tong University, 2023, 57(12): 1631-1638.

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t/d	U
t/d	差分解	解析解
100	0.609 5	0.616 2
200	0.788 4	0.816 7
400	0.927 4	0.955 0
1 000	0.996 6	0.993 6

隧道周围饱和软土二维非线性固结分析

Two Dimensional Nonlinear Consolidation Analysis of Saturated Soft Soil Around Tunnel

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