A one-dimensional strain-rate based model for soft structured clays

Abstract

The paper aims to investigate the destructuration effect on the time-dependent behaviour of soft structured clays. Viscosity coupled with destructuration is analysed based on experimental observations. A strain-rate based model is developed to describe the mechanical behaviour for both unstructured and structured clays under one-dimensional loading. The advantage of the proposed model lies in the determination of model parameters in a straightforward way, which leads to an easy use of the model for practical problems. Coupled with consolidation, the model is used to simulate oedometer tests at constant rate of strain and long-term creep oedometer tests on two structured clays. All comparisons between predicted and measured results demonstrate that the proposed model can reasonably describe the effect of destructuration on the time-dependent behaviour of soft structured clay under one-dimensional condition. Although the model is proposed for one-dimensional analysis, it can be a good base for developing a more general 3D model. structured clays, viscoplasticity, consolidation, creep, strain-rate, destructuration Citation: Yin Z Y, Wang J H. A one-dimensional strain-rate based model for soft structured clays. Sci China Tech Sci, 2012, 55: 90100,

Numerical Modeling of Thermal‐Dependent Creep Behavior of Soft Clays under One‐Dimensional Condition

“…where σ ′r p denotes the preconsolidation pressure. e above relationships have been suggested in [18][19][20] and validated in [6,10].…”

“…First, a time-dependent stress-strain model without the thermal e ect needs to be selected as a base [6]. e adopted model is presented brie y in this part.…”

“…e creep behavior of the soft clay has been investigated experimentally in [1][2][3][4][5]. Based on that, some practical models have been developed [6][7][8][9].…”

A modified creep index and its application to viscoplastic modelling of soft clays

“…From real construction projects, it is well known that soft clays exhibit time-dependent behaviors due to their viscosity (Mesri and Godlewski, 1977;Leroueil et al, 1985;Yin et al, 2002;Augustesen et al, 2004;Yin and Hicher, 2008;Yin and Wang, 2012). The creep index C e , conventionally expressed by C e = e/ lgt (where e is the void ratio and t is the time) based on conventional consolidation test (1D) (Fig.…”

An efficient parameter identification procedure for soft sensitive clays

“…The initial soil structure of soft clays and their destructuring behavior, which is defined by the bond between soil particles, are important considerations. Due to the effects of sedimentation and chemical action, the structure exists more or less in the natural clays (Leroueil and Vaughan, 1990;Yin and Hicher, 2008;Karstunen and Yin, 2010;Yin et al, 2010a;2010b;2010c;2011a;2011b;2015a;2015b;Yin and Karstunen, 2011;Yin and Wang, 2012;Wang and Yin, 2015). Another significant behavior of soft clay is creep.…”