Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2022 , Vol. 56 >Issue 4: 443 - 453

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2021.019

Naval Architecture, Ocean and Civil Engineering

Analysis of 1-D Consolidation of Double-Layered Saturated Porous-Fissured Clay Foundation

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  • Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

Received date: 2021-01-18

  Online published: 2022-05-07

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Abstract

In order to study the one-dimensional (1-D) consolidation behavior of double-layered saturated porous-fissured clay foundation, the governing consolidation equations of saturated porous-fissured media were developed based on the mixture theory under the condition of one-dimensional complete confinement. The finite element program for 1-D consolidation of saturated porous-fissured clay was compiled by Fortran language, and the results of single-layered foundation research were used to verify the correctness of this model and program. The influences of compression modulus, permeability coefficient, and soil thickness on the consolidation behavior of double-layered saturated porous-fissured clay foundation were analyzed by using the finite element program. The results show that the consolidation rate of the foundation can be significantly accelerated by increasing the compression modulus and permeability coefficient of the softer topsoil, and the dissipation laws of excess pore water pressure and excess fissure water pressure were different. The dissipation of excess pore water pressure at the base of the foundation would lag behind that of excess fissure water pressure, and the lag would increase with the increase of the permeability coefficient of topsoil. For double-layered saturated porous-fissured clay foundation, improving the softer porous-fissured clay properties of the upper layer can better improve the consolidation behavior of the foundation.

Key words： double-layered foundation; one-dimensional (1-D) consolidation; saturated porous-fissured clay; mixture theory

Cite this article

HU Yayuan, WANG Aqiang . Analysis of 1-D Consolidation of Double-Layered Saturated Porous-Fissured Clay Foundation[J]. Journal of Shanghai Jiaotong University, 2022 , 56(4) : 443 -453 . DOI: 10.16183/j.cnki.jsjtu.2021.019

References

[1] 余松霖, 柯瀚, 詹良通, 等. 工程渣土的工程特性及矿坑填埋场的工后沉降和容量分析[J]. 浙江大学学报(工学版), 2020, 54(12): 2364-2376.
[1] YU Songlin, KE Han, ZHAN Liangtong, et al. Engineering properties of excavated soil and analysis of post-construction settlement and capacity for pit landfill[J]. Journal of Zhejiang University (Engineering Science), 2020, 54(12): 2364-2376.
[2] ZHAN L T, ZHANG Z, CHEN Y M, et al. The 2015 Shenzhen catastrophic landslide in a construction waste dump: Reconstitution of dump structure and failure mechanisms via geotechnical investigations[J]. Engineering Geology, 2018, 238: 15-26.
[3] YANG L A, TAN T S, TAN S A, et al. One-dimensional self-weight consolidation of a lumpy clay fill[J]. Géotechnique, 2002, 52(10): 713-725.
[4] JUNEJA A, CHAFALE A S. Consolidation beha-viour of double-porosity clay using flexible wall permeameter[J]. Proceedings of the Institution of Civil Engineers-Ground Improvement, 2019, 172(3): 179-191.
[5] SHI X S, HERLE I, MUIR WOOD D. A consolidation model for lumpy composite soils in open-pit mining[J]. Géotechnique, 2018, 68(3): 189-204.
[6] CHENG T, YAN K Q, ZHENG J J, et al. Semi-analytical and semi-numerical method for plane strain consolidation of double-layer foundation considering stress paths[J]. European Journal of Environmental and Civil Engineering, 2017, 21(10): 1187-1216.
[7] 崔军, 谢康和, 夏长青, 等. 变荷载下考虑结构性的双层地基一维非线性固结分析[J]. 中南大学学报(自然科学版), 2018, 49(7): 1710-1717.
[7] CUI Jun, XIE Kanghe, XIA Changqing, et al. One-dimensional nonlinear consolidation analysis of double layered structured soils under time-dependent loading[J]. Journal of Central South University (Science and Technology), 2018, 49(7): 1710-1717.
[8] 钟祖良, 别聪颖, 胡伦, 等. 基于Forchheimer渗流的土石混合体单向固结模型研究[J]. 地下空间与工程学报, 2019, 15(2): 473-480.
[8] ZHONG Zuliang, BIE Congying, HU Lun, et al. Research on one-dimensional consolidation model of soil-rock mixtures backfill under Forchheimer seepage model[J]. Chinese Journal of Underground Space and Engineering, 2019, 15(2): 473-480.
[9] 刘忠玉, 夏洋洋, 石明生, 等. 考虑自重应力和Hansbo渗流的饱和黏土一维弹黏塑性固结分析[J]. 岩土工程学报, 2020, 42(2): 221-229.
[9] LIU Zhongyu, XIA Yangyang, SHI Mingsheng, et al. One-dimensional elastic viscoplastic consolidation analysis of saturated clay considering gravity stress and Hansbo’s flow[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(2): 221-229.
[10] 江留慧, 李传勋, 杨怡青, 等. 变荷载下双层地基一维非线性固结近似解析解[J]. 岩土力学, 2020, 41(5): 1583-1590.
[10] JIANG Liuhui, LI Chuanxun, YANG Yiqing, et al. Approximate analytical solutions for one-dimensional nonlinear consolidation of double-layered soil under time-dependent loading[J]. Rock and Soil Mechanics, 2020, 41(5): 1583-1590.
[11] CHEN R P, LIU P, LIU X M, et al. Pore-scale model for estimating the bimodal soil-water characteristic curve and hydraulic conductivity of compacted soils with different initial densities[J]. Engineering Geology, 2019, 260: 105199.
[12] 蔡国庆, 吴天驰, 王亚南, 等. 双孔结构非饱和压实土微观结构演化模型[J]. 岩土力学, 2020, 41(11): 3583-3590.
[12] CAI Guoqing, WU Tianchi, WANG Yanan, et al. Model of the microstructure evolution of unsaturated compacted soils with double-pore structure[J]. Rock and Soil Mechanics, 2020, 41(11): 3583-3590.
[13] GU K, SHI B, LIU C, et al. Investigation of land subsidence with the combination of distributed fiber optic sensing techniques and microstructure analysis of soils[J]. Engineering Geology, 2018, 240: 34-47.
[14] 巩学鹏, 唐朝生, 施斌, 等. 黏性土干/湿过程中土结构演化特征研究进展[J]. 工程地质学报, 2019, 27(4): 775-793.
[14] GONG Xuepeng, TANG Chaosheng, SHI Bin, et al. Evolution of soil microstructure during drying and wetting[J]. Journal of Engineering Geology, 2019, 27(4): 775-793.
[15] KHALILI N, VALLIAPPAN S, WAN C F. Consolidation of Fissured clays[J]. Géotechnique, 1999, 49(1): 75-89.
[16] GHAFOURI H R, LEWIS R W. A finite element double porosity model for heterogeneous deformable porous media[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1996, 20(11): 831-844.
[17] CALLARI C, FEDERICO F. FEM validation of a double porosity elastic model for consolidation of structurally complex clayey soils[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2000, 24(4): 367-402.
[18] 刘艳, 赵成刚, 蔡国庆. 理性土力学与热力学[M]. 北京: 科学出版社, 2016.
[18] LIU Yan, ZHAO Chenggang, CAI Guoqing. Rational soil mechanics and thermodynamics [M]. Beijing: Science Press, 2016.
[19] ZHANG Q, CHOO J, BORJA R I. On the preferential flow patterns induced by transverse isotropy and non-Darcy flow in double porosity media[J]. Compu-ter Methods in Applied Mechanics and Engineering, 2019, 353: 570-592.
[20] 龚晓南, 谢康和. 土力学[M]. 北京: 中国建筑工业出版社, 2014: 15-89.
[20] GONG Xiaonan, XIE Kanghe. Soil mechanics [M]. Beijing: China Architecture and Building Press, 2014: 15-89.
[21] 雷华阳, 任倩, 卢海滨, 等. 相对厚度变化下双层软黏土地基固结特性研究[J]. 地下空间与工程学报, 2018, 14(3): 705-711.
[21] LEI Huayang, REN Qian, LU Haibin, et al. Research on consolidation property of double layer soft clay foundation under different relative thickness conditions[J]. Chinese Journal of Underground Space and Engineering, 2018, 14(3): 705-711.
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