Nonlinear rheological consolidation analysis of soil around tunnel based on fractional order model

被引：1
|
作者：
Hu A.-F. [1 ,2 ]
Jiang H. [1 ,3 ]
Xiao Z.-R. [4 ]
Xie S.-L. [1 ]
Gong Z.-Q. [5 ]
Li W.-Q. [6 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
[2] Center for Balance Architecture, Zhejiang University, Hangzhou
[3] The Architectural Design and Research Institute, Zhejiang University Co. Ltd, Hangzhou
[4] School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou
[5] Zhejiang Province Architectural Design and Research Institute, Hangzhou
[6] Urban Rail Traffic Engineering Branch, China Railway No.10 Engineering Group, Guangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2023年 / 57卷 / 11期
关键词：
finite difference method; fractional order model; nonlinear rheological consolidation; saturated soft soil; tunnel;
D O I：
10.3785/j.issn.1008-973X.2023.11.010
中图分类号：
学科分类号：
摘要：
The two-dimensional nonlinear consolidation control equation was established, considering the nonlinear changes of compressibility and permeability of the saturated soft soil around the tunnel. The fractional-order Merchant model was introduced to consider the influence of soil rheological properties, and the alternating implicit difference method in Douglas-Jone format was used to solve the equation. The correctness of the solutions was verified by the comparison with the existing analytical solutions. The nonlinear rheological consolidation characteristics of the saturated soft soil around the tunnel were investigated by using the obtained difference decomposition for parametric analysis. Results show that the tunnel leakage pattern, initial permeability coefficient, and permeability index have a large influence on the consolidation rate of the soil, and the more the permeable channels, the larger the initial permeability coefficient, and the smaller the permeability index, the faster the consolidation rate of the soil, while the compression index has a smaller influence on the consolidation rate. The coefficient of permeability anisotropy has a significant effect on the rate of consolidation, and the difference in permeability coefficients in different directions of the soil should be fully considered in the analysis of consolidation properties. When considering the rheological properties of the soil, the consolidation rate of the soil slows down significantly, but when the initial permeability coefficient increases to a certain degree, the effect of the rheological properties of the soil on the consolidation rate of the soil layer can be ignored. © 2023 Zhejiang University. All rights reserved.
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页码：2227 / 2234
页数：7
相关论文
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