Effect of pore fluid osmotic suction on matric and total suctions of compacted clay

Thyagaraj, T.; Salini, U.

doi:10.1680/jgeot.14.p.210

Cited by 65 publications

(33 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the current problem under study, three distinct water retention mechanisms are considered: water adsorption, capillary retention and osmosis. The total suction (S u ) is equal to the sum of matric suction (p m ) and osmotic suction (p), according to the definition of soil suction by the International Society of Soil Science and others [23,52]. Water adsorption upon clay minerals at high suction levels and capillary retention at lower suction levels [10,48] are responsible for matric suction.…”

Section: Wrc For Mx-80 Bentonitementioning

confidence: 99%

A dual-porosity model for the study of chemical effects on the swelling behaviour of MX-80 bentonite

Li¹,

Zheng

et al. 2019

Acta Geotech.

View full text Add to dashboard Cite

Significant chemical influence on the swelling potential of MX-80 bentonite was observed during swelling tests where specimens were hydrated with highly concentrated brine. The maximum swelling pressure for specimens hydrated with brine was about 30% of the maximum swelling pressure for the same specimens hydrated with de-ionized water. The maximum swelling pressure was attained within tens of hours of brine infiltration and further decreased by half within a year. A fully coupled hydro-mechanical-chemical (HMC) dual-porosity model is proposed in this paper to interpret the swelling behaviour of MX-80 when infiltrated with brine. The dependence of hydraulic and mechanical properties on such factors as porosity, salinity and water content was investigated. A nonlinear elastic constitutive model was proposed to correlate the swelling pressure with the variation in the microporosity. The chemical effects on the mechanical behaviour were coupled at the micropore level. A number of relationships have been developed for MX-80, i.e. micropore permeability as a function of void ratio, water retention characteristics of micropores and macropores, micropore dependence on water content and the diffusion coefficients of the two types of pore structure. The proposed model was successful in reproducing both quantitatively and qualitatively the experimental results from two sets of infiltration experiments on compacted MX-80 bentonite.

show abstract

Section: Wrc For Mx-80 Bentonitementioning

confidence: 99%

A dual-porosity model for the study of chemical effects on the swelling behaviour of MX-80 bentonite

Li¹,

Zheng

et al. 2019

Acta Geotech.

View full text Add to dashboard Cite

show abstract

“…For partially saturated clays, as the salinity of water decreases and water content and clay plasticity increase, the interparticle repulsive forces increase [43]. Several researchers showed that reconstituting a clay specimen with distilled water could produce a monomodal pore size microstructure (uniform pore size) whereas aggregated microstructure (bimodal pore size) is expected as the salinity of pore water increases [5,38,44,45]. erefore, for clay specimens reconstituted at constant water content and dry density but using di erent water in terms of its salinity level, a di erent number and area of interparticle contacts are expected.…”

Section: Conceptual Understanding For the E Ect Of Pore-watermentioning

confidence: 99%

Effect of Pore-Water Salinity on the Electrical Resistivity of Partially Saturated Compacted Clay Liners

Abuel-Naga

Rashid

et al. 2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The aim of this paper is to investigate the effect of pore-water salinity on the electrical resistivity (ER) of different compacted clay liners (CCLs) in terms of its mineralogical composition. For this purpose, an experimental programme was conducted where ERs of different kaolin-dominant CCL specimens, reconstituted using water having different concentrations of NaCl (0 M, 0.5 M, and 1.0 M), were measured. The kaolin-dominant CCL specimens tested in this study include pure kaolin, three different kaolin-bentonite mixtures, and three different kaolin-sand mixtures. The experimental results show that the ERs of CCL specimens decrease as the salt concentrations in pore water, moisture content, and dry density increase. At constant density and moisture content, the test results also indicate that increasing the sand content in kaolin-dominant CCL specimens increases its ER regardless of the water salinity level. This behaviour could be attributed to the lower surface conduction of sand compared to kaolin. However, at constant density and moisture content, increasing the bentonite content in kaolin-dominant CCL specimens decreases its ER in the distilled water environment as surface conduction of bentonite is higher compared to that of kaolin. On the contrary, in saltwater environments, ER increases as the bentonite content increases. This behaviour could be explained in terms of the expected aggregated microstructure of bentonite in the saltwater environment that could reduce the number and area of interparticle contacts, and consequently, increase the ER of CCL specimens.

show abstract

“…Table 4 shows the soil suction values in filter paper water contents ranges (w f ) <= 47% calculated by using proposed equations (Eqs. [6][7][8][9]. Figure 4 gives a linear logarithmic calibration curve for Whatman 42 filter paper used in the experimental work which is expressed by Eqs.…”

Section: Figmentioning

confidence: 99%

“…For measuring matric suction, the calibration curves are obtained from the wetting and drying of the filter papers through fluid transfer (porous plates). Total suction and pore fluid osmotic suction can be confidently determined using non-contact filter papers difference of which will give matric suction [8].…”

Section: Introductionmentioning

confidence: 99%

Calibration of filter paper for measuring total soil suction

Pande

Khandeshwar

Bajad³

et al. 2019

SN Appl. Sci.

View full text Add to dashboard Cite

Calibration curve plays an important role in filter paper method because it affects accuracy in soil suction values. Osmotic coefficient and relative humidity govern the osmotic suction required to develop calibration curve and equation. Most of the researchers used the readily available total (osmotic) suction values from various studies to develop the calibration curve. Very few researchers used the osmotic coefficient in calibration and studied its effect on calibration and measuring suction. In this paper, the effect of the osmotic suction proposed by various researchers on calibration of Whatman 42 Filter paper was studied. Logarithmic and exponential calibration equations were developed and compared. The NaCl solution used in the present study provides limited total suction range of 0-30,000 kPa. The total suction of clayey soil was measured to validate the calibration curves proposed in this study. The feasibility of proposed osmotic coefficients is verified by measuring total suction of soil. The total suction estimated from calibration curve using osmotic coefficients was found to be more accurate.

show abstract

Effect of pore fluid osmotic suction on matric and total suctions of compacted clay

Cited by 65 publications

References 32 publications

A dual-porosity model for the study of chemical effects on the swelling behaviour of MX-80 bentonite

A dual-porosity model for the study of chemical effects on the swelling behaviour of MX-80 bentonite

Effect of Pore-Water Salinity on the Electrical Resistivity of Partially Saturated Compacted Clay Liners

Calibration of filter paper for measuring total soil suction

Contact Info

Product

Resources

About