Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay

XIA Changqing; HU Anfeng; FU Peng; CUI Jun; XIE Kanghe; ZHOU Yushan

doi:10.3969/j.issn.0258-2724.20170612

Volume 54 Issue 6

Nov. 2019

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Journal of Southwest Jiaotong University > 2019 > 54(6): 1244-1251.

XIA Changqing, HU Anfeng, FU Peng, CUI Jun, XIE Kanghe, ZHOU Yushan. Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1244-1251. doi: 10.3969/j.issn.0258-2724.20170612

Citation:

XIA Changqing, HU Anfeng, FU Peng, CUI Jun, XIE Kanghe, ZHOU Yushan. Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1244-1251. doi: 10.3969/j.issn.0258-2724.20170612

Citation:

XIA Changqing, HU Anfeng, FU Peng, CUI Jun, XIE Kanghe, ZHOU Yushan. Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1244-1251. doi: 10.3969/j.issn.0258-2724.20170612

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Semi-analytical Analysis of One-Dimensional Nonlinear Consolidation of Multi-layered Structured Soft Clay

doi: 10.3969/j.issn.0258-2724.20170612

XIA Changqing^{1,2
,},
HU Anfeng^{1,2
,
,},
FU Peng^1,2,
CUI Jun^1,2,
XIE Kanghe^1,2,
ZHOU Yushan^1,2

Received Date: 11 Aug 2017
Rev Recd Date: 26 Jun 2018

Available Online: 21 Mar 2019

Publish Date: 01 Dec 2019

Abstract

Abstract

To study the impact of structural properties on the consolidation behavior of multi-layered soft clay under time-dependent loading, the problem of nonlinear consolidation of structured soft clay was addressed by analyzing the nonlinear variable permeability and compressibility of structured soft clay and the variation of the yield stress with depth. First, the consolidation process in different drainage situations was analyzed in detail using the structured soft clay trilinear compression model and e-lg k_v permeability model. Then, one-dimensional consolidation equations were established by semi-analytical method. A calculation procedure was developed to solve the problem, and the effectiveness of the proposed method was verified by comparison with the existing nonlinear consolidation results. Finally, in the engineering background of a four-layer soft clay ground, influences of time-dependent loading and structural properties on the consolidation behavior of multi-layered soft clay were investigated. The results show that when the ultimate load is fixed while loading rates are varying, the degree of consolidation defined in terms of effective stress (U_p) is larger than that defined in terms of settlement (U_s) at the early stage, but the opposite will occur at the late stage. On the other hand, when the loading rate is fixed but the ultimate loads are different, with the ultimate load increasing, the values of U_s and U_p decrease at the early stage but increse at the late stage. At the early stage of cosolidation, the U_p obtained by the nonlinear consolidation analysis considering structural properties is significantly larger than that without considering structural properties, but the discrepancy decreases gradually as the consolidation proceeds.
- time-dependent loading,
- structural properties,
- multi-layered ground,
- non-linear consolidation,
- semi-analytical method

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References(19)

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