Osmotic Swelling and Osmotic Consolidation Behaviour of Compacted Expansive Clay

Thyagaraj, T.; Rao, Sudhakar M.

doi:10.1007/s10706-012-9596-0

Cited by 41 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, the study of creep behavior has been extended to evaluate the longterm deformation of most geotechnical engineering applications such as slope stability, tunnel, dam, etc. More robust research, such as study of the three-dimensional or in situ creep behavior of different kinds of soils, such as clay (Sayed-Ahmed et al, 1998;Naumann et al, 2007;Maio et al, 2015), boom clay (Yu et al, 2015), soft clay (Yin et al, 2015), expansive clay (Vu and Fredlund, 2004;Thyagaraj and Rao, 2013), and sand (Zhang et al, 2018) have been carried out. The long-term mechanical properties of sandstone and tailings are particularly important in the fields of hydropower, energy, mining and others.…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of Red-Clay Under Triaxial Compression Condition

Ke-min

Wang

et al. 2020

Front. Earth Sci.

View full text Add to dashboard Cite

To investigate the shear strength and creep behavior of red-clay, laboratory experiments were conducted and the experimental results were compared with available theoretical creep models. Based on the consolidated drained (CD) triaxial tests results, internal friction angle and cohesion of the red clay soil were 21.5 • and 61.1 kPa, respectively. Three different confining pressures were set up to conduct the creep tests using multistage loading. The overall creep curves exhibited stepped stress-strain behavior. The creep behaviors were remarkably different from the soils tested with three distinct confining stresses. The post-creep failure mode of all the red clay samples exhibited drum shaped parabolic bulging with predefined shear planes. The experimental results were compared with three different types of creep models that used in practice. Among all of this verified results, Burger's model behaved betted than other models when fitting with the data collected from the experiment. An experimental result based empirical equation has also been developed which fits well with the experimental results obtained from the tested red clay samples. The results of this study will be helpful to evaluate the long-term shear strength and deformation of red clays subjected to various structural loadings.

show abstract

Section: Introductionmentioning

confidence: 99%

Creep Behavior of Red-Clay Under Triaxial Compression Condition

Ke-min

Wang

et al. 2020

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…In unsaturated soil mechanics, osmotic suction is attributed to the salt concentration of the pore water (Fredlund and Rahardjo, 1993) which affects the soil structure of clayey soils and does not act like matric suction (Leong and Abuel-Naga, 2017). Research has shown that the volume change of soil can occur due to a difference in salt concentration in the pore water between different zones of the soil ( Barbour and Fredlund, 1989; Barbour, 1987;Di Maio, 1996; Rao and Thyagaraj, 2007;Thyagaraj and Rao, 2013). The resulting osmotic gradient causes water to move between zones and this is termed osmotically-induced consolidation (Barbour and Fredlund 1989).…”

Section: Introductionmentioning

confidence: 99%

Osmotic consolidation of expansive soil

Bulolo

Leong

2019

JGS Special Publication

View full text Add to dashboard Cite

The mechanical behavior of expansive soils is influenced by the concentration of salts in their pore water. Research has shown that volume change of soil can occur due to a difference in salt concentration in the pore water between different zones of the soil as a result of either osmotically-induced consolidation or osmotic consolidation. The effect of the salt concentration of the pore water in unsaturated soil mechanics can be expressed as osmotic suction. Very little work has been done to quantify the mechanical equivalence of osmotically-induced and osmotic consolidation. This study attempts to quantify the mechanical stress equivalence of consolidation of an expansive soil submerged in a salt solution. Two remoulded soil samples of kaolin-bentonite mixture in proportions of 70%-30% and 90%-10%, (kaolin-bentonite) by dry mass were submerged in different concentrated salt solutions to investigate the effect of osmotic suction. Results showed that osmotic suction caused an additional settlement over the consolidation settlement under a mechanical stress but does not affect the soil compressibility. The osmotic coefficient of volume change (mπ) is only a fraction of the coefficient of volume change (mv). .

show abstract

“…For example, an increase/decrease in the cation concentration in the pore fluid causes volume shrinkage/expansion, called osmotic consolidation/swelling. Such osmotic behaviours of expansive soils have often been investigated [5][6][7]. However, quantitative evaluations and a generalization of these osmotic behaviours, especially when several ions are present in the environment, are still lacking; this is because expansive soils generally have low permeability and chemical experiments require extended periods of time.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical investigations of volume change behaviour of saturated expansive soils in oedometer test

2019

View full text Add to dashboard Cite

The chemical and mechanical behaviours of saturated bentonite were experimentally and analytically investigated. A series of oedometer tests on saturated bentonite was conducted. By replacing the cell fluid during the oedometer test, one-dimensional osmotic consolidation and swelling behaviour were observed. The experimental results were simulated numerically using a constitutive model by considering the influence of electrochemical phenomena of clay mineral crystals on the macrostructural behaviour. It was concluded that the typical mechanical swellability of water-saturated bentonite in oedometer test is affected by a positive dilatancy behaviour due to the lower shear strength. After the osmotic consolidation test, a lateral contraction of the specimen in the oedometer was observed; this affected the compressibility during the subsequent mechanical consolidation. It was also concluded that the concentration of Na+ in the pore fluid affects the specific mechanical properties of bentonite.

show abstract

Osmotic Swelling and Osmotic Consolidation Behaviour of Compacted Expansive Clay

Cited by 41 publications

References 14 publications

Creep Behavior of Red-Clay Under Triaxial Compression Condition

Creep Behavior of Red-Clay Under Triaxial Compression Condition

Osmotic consolidation of expansive soil

Experimental and analytical investigations of volume change behaviour of saturated expansive soils in oedometer test

Contact Info

Product

Resources

About