A probabilistic permeability model and the pore size density function

Juang, C. H.; Holtz, Robert D.

doi:10.1002/nag.1610100506

Cited by 70 publications

(24 citation statements)

References 15 publications

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“…• The methods should help in the detection of nonuniformity patterns and monitoring of local (1975) Al-Rawas and McGown (1999) Pusch (1999) Romero (1999) Villar and Lloret (2001) Cui et al (2002) Montes-H (2002) Montes In the MIP technique an absolute pressure p is applied to a non-wetting liquid (mercury) in order to enter the empty pores. The following Washburn equation applies (Diamond 1970;Juang and Holtz 1986b;Webb and Orr 1997) for pores of cylindrical shape and parallel infinite plates (fissure-like microstructure)…”

Section: Methods For Microstructural Characterisation Of Unsaturated mentioning

confidence: 99%

Microstructure Investigation in Unsaturated Soils: A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy

2008

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With the advent of modern microstructural testing techniques and microstructure based constitutive models the microstructural characterisation of soils is gaining prominence. This paper reviews the history of microstructure investigation in unsaturated soils and discusses the engineering significance of this research to date. After a brief overview of the main microstructural techniques, the paper focuses on the evaluation of the current state of use and the development of two widely used techniques to study the microstructure of partially saturated soils, namely mercury intrusion porosimetry and the environmental scanning electron microscopy. The details of these techniques, their advantages and limitations, are first covered, followed by the presentation of selected test results. These results highlight the use of these techniques for understanding different hydro-mechanical behavioural features observed at macroscopic scale. Specifically, the paper shows the use of these techniques to explore the fundamental properties of water retention characteristics, water permeability, and micro and macrostructural interactions along different hydro-mechanical paths.

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Section: Methods For Microstructural Characterisation Of Unsaturated mentioning

confidence: 99%

Microstructure Investigation in Unsaturated Soils: A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy

2008

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“…The derivative of the cumulative intrusion curve gives the pore size density function shown on the lower part of Fig. 10 (Juang & Holtz, 1986a). This function, defined as…”

Section: Mercury Intrusion Porosimetry Investigations Clay Microstrucmentioning

confidence: 99%

Evolution of microstructure in compacted London Clay during wetting and loading

Monroy¹,

Zdravković²,

Ridley³

2010

Géotechnique

205

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The influence of fabric on mechanical behaviour is explicitly considered in some of the current constitutive models for unsaturated soils. These are based on assumptions regarding the interaction between different levels of structure, which still require experimental validation. A study has been carried out to investigate the evolution of fabric in a compacted natural clay during wetting and loading, and the results are presented in this paper. Samples of London Clay were statically compacted to the same initial conditions, dry of optimum moisture content in a Proctor plot, and subsequently taken along complex stress paths involving wetting, loading, or a combination of both. Mercury intrusion porosimetry (MIP) and environmental scanning electron microscopy (ESEM) microstructure investigations were carried out to observe and quantify the change in fabric associated with each path. The soil fabric was observed to change from an aggregate to a matrix type structure along all wetting paths. This transition was found to take place only when the suction was reduced to a value close to zero kPa. Results also showed that fabric changes during yielding were stress path-dependent. It was not possible to find a correspondence between the volume of free porosity and the volume of intra-aggregate pores, as suggested by some authors. Finally, the volume of pore water was found to agree closely with the volume of intra-aggregate pores, providing support to the assumption that in an unsaturated aggregate microstructure the clay aggregations are saturated.

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“…An MIP test gives the cumulative mercury volume intruded as a function of the equivalent pore radius. To further interpret MIP data, some authors have proposed the determination of the pore-size distribution (PSD) of the sample [31], defined as follows:…”

Section: Soil Fabric Determination With Mercury Intrusion Porosimetrymentioning

confidence: 99%

Fabric evolution during hydromechanical loading of a compacted silt

Cuisinier

Laloui

2004

Num Anal Meth Geomechanics

114

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SUMMARYA study was undertaken on a compacted silt to determine fabric modifications induced by suction and/or stress variations. The link between fabric and hydromechanical behaviour was also investigated. A suctioncontrolled oedometer, using air overpressure, was developed for this purpose and mercury intrusion porosimetry was employed to determine sample fabric. The initial samples fabric was made of macro and micropores. It was shown that suction increase produced a strong decrease in the macroporosity associated with an increase in microporosity. However, some macropores were not significantly affected by the suction increase; this phenomenon might be related to the initial fabric of the samples. Second, it appears that loading under saturated conditions also produces strong fabric modification: the higher the applied stress, the lower the macroporosity. Soil fabric depends on the maximum stress experienced by the soil. Finally, some tests have shown the influence of suction, as well as the role of the degree of saturation, on the deformation process and the mechanical behaviour. The test results show that in the case of unsaturated mechanical loading, all macropores are not destroyed by the mechanical loading.

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A probabilistic permeability model and the pore size density function

Cited by 70 publications

References 15 publications

Microstructure Investigation in Unsaturated Soils: A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy

Microstructure Investigation in Unsaturated Soils: A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy

Evolution of microstructure in compacted London Clay during wetting and loading

Fabric evolution during hydromechanical loading of a compacted silt

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