New Concept of Effective Stress in Unsaturated Soil and Its Proving Test

Karube, Daizo

doi:10.1520/stp29097s

Cited by 26 publications

(18 citation statements)

References 4 publications

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“…The results of several tests on partially saturated compacted kaolin in a triaxial cell were reported in [26]. The following basic properties of the soil are provided in this reference: WL = 37%; IP = 28% ; clay fraction : 22%; maximum size of particles: 0.04 mm.…”

Section: Comparison Between Model Predictions and Experimental Resultsmentioning

confidence: 99%

“…They were subsequently consolidated under the initial stress state (p = 0.02 MPa ; S = 0.05 MPa) and they reached SrO = 0.645 and Vo = 2.098. Two alternative isotropic stress paths, shown in Figure 2.11a, starting and ending at the same stress point were followed [26]. The variation of specific volume is plotted in Figure 2.…”

Section: Comparison Between Model Predictions and Experimental Resultsmentioning

confidence: 99%

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Constitutive Laws

Gens

1995

Modern Issues in Non-Saturated Soils

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Constitutive laws for unsaturated soils under nonisothermal conditions are presented in this Chapter. The development of the models is carried out in a progressive manner. First the Cam-clay constitutive law for saturated soils is briefly described. Using net stress and suction as independent stress variables, the Cam-clay model is generalized to include the effect of partial saturation. Some consequences of the model are reviewed and its prediction capabilities are tested in relation to some selected experimental results. Finally, the model is extended to include temperature effects. A suite of constiturive laws is therefore obtained capable of reproducing increasingly complex features of soil behaviour. Important advantages ensue from the fact that they can be regarded as progressive developments within a shared strain-hardening elasto-plastic framework.

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Section: Comparison Between Model Predictions and Experimental Resultsmentioning

confidence: 99%

Section: Comparison Between Model Predictions and Experimental Resultsmentioning

confidence: 99%

Constitutive Laws

Gens

1995

Modern Issues in Non-Saturated Soils

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show abstract

“…The deformations caused by foundation weight and point load are instead retained, as they are effects of construction. The parameter values of the BBM (Table 1) are adapted from Alonso et al (1990), and refer to compacted kaolin (derived from experimental data of Karube, 1988). In Table 1, k and k s are the elastic compressibility indexes associated with changes of mean net stress p (at constant suction s) and changes of suction s (at constant p) respectively.…”

Section: The Modelmentioning

confidence: 99%

Rainfall-induced differential settlements of foundations on heterogeneous unsaturated soils

Le¹,

Gallipoli²,

Sánchez³

et al. 2013

Géotechnique

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This study stochastically investigates the rainfall-induced differential settlement of a centrally loaded, rigid strip foundation on an unsaturated soil with spatially varying values of either preconsolidation stress or porosity. The differential settlement (between the two foundation ends) is calculated at various times during rainfall by way of a coupled, hydro-mechanical, finite-element analysis. The Barcelona basic model describes the mechanical behaviour of the soil, and the van Genuchten relationships describe water retention and permeability. The variability of soil properties is modelled by means of random fields with spatial correlation in the framework of a Monte Carlo simulation. The study demonstrates that the occurrence of rainfall-induced differential settlements can be consistently analysed using concepts of unsaturated soil mechanics and random field theory. Results show that differential settlements can be vastly underpredicted (or even completely missed) if random heterogeneity and partial saturation are not simultaneously considered. The variation of differential settlements and their statistics during the rainfall depend on the magnitude of the applied load and the statistics of soil variability. Moreover, the transient phase of infiltration and a spatial correlation length equal to the width of the foundation pose the highest risk of differential settlement.

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“…The results of several tests on partially saturated compacted kaolin in a triaxial cell were reported by Karube (1986). The following basic properties of the soil are provided in this reference: wL = 37%; IP = 28%; clay fraction: 22%; maximum size of particles: 0.04mm.…”

Section: Tests On Partially Saturated Compacted Kaolin Reported By Kamentioning

confidence: 99%

“…Two alternative isotropic stress paths, shown in Fig. 25(a), starting and ending at the same stress point were followed by Karube (1986). The variation of specific volume is plotted in Fig.…”

Section: Tests On Partially Saturated Compacted Kaolin Reported By Kamentioning

confidence: 99%

Constitutive model for partially saturated soils

1991

International Journal of Rock Mechanics and Mining Sciences &am

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The Paper presents a constitutive model for describing the stress-strain behaviour of partially saturated soils. The model is formulated within the framework of hardening plasticity using two iodependent sets of stress variables: the excess of total stress over air pressure and the suction. The mode1 is able to represent, in a consistent and unified manner, many of the fundamental features of the behaviour of partially saturated soils which had been treated separately by previously proposed models. On reaching saturation, the mode1 becomes a conventional critical state model. Because experimental evidence is still limited, the model has been kept as simple as possible in order to provide a basic framework from which extensions are possible. Tbe mode1 is intended for partially saturated soils which are slightly or moderately expansive. After formulating the model for isotropic and biaxial stress states, typical predictions are described and compared, in a qualitative way, with characteristic trends of the behaviour of partially saturated soils. Afterwards, the results of a number of suction-controlled laboratory tests on compacted kaolin and a sandy clay are used to evaluate the ability of the model to reproduce, quantitatively, observed behaviour. The agreement between observed and computed results is considered satisfactory and confirms the possibilities of reproducing the most important features of partially saturated soil behaviour using a simple general framework. KEYWORDS

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New Concept of Effective Stress in Unsaturated Soil and Its Proving Test

Cited by 26 publications

References 4 publications

Constitutive Laws

Constitutive Laws

Rainfall-induced differential settlements of foundations on heterogeneous unsaturated soils

Constitutive model for partially saturated soils

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