Strength of gypsum-clay soils and its variation during the leaching of salts

Petrukhin, V. P.; Arakelyan, E. A.

doi:10.1007/bf01711765

Cited by 11 publications

(3 citation statements)

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“…The reason for this behavior can be deduced from the behavior of internal friction angle (ø) where the mineral friction increases simultaneously with increasing gypsum content due to the high coefficient of friction of the gypsum particles, however the porosity of the gypsum-soil increases with increasing gypsum content leading to a reduction in (ø) which affects the shear strength. [13]. Fig.…”

Section: Laboratory Testsmentioning

confidence: 99%

Application of Dynamic Cone Penetration Test to Gypseous Soils

Al-Obaidi

Al-Ashoishi

2018

Tikrit j. eng. sci.

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Dynamic cone penetration test (DCPT) is a fast, economical and easy to conduct. It is widely used to assess the strength of natural and compacted soils. The device is introduced in the 1950s. However, it was newly introduced in Iraq. This study aims to evaluate the potentials of DCP in geotechnical explorations in the gypseous soil since it covers a large area of the country and to obtain correlations with the California bearing ratios (CBR) and investigating the effect of gypsum on the CBR-DCP relationship. Field and Laboratory tests were conducted on soil sample retrieved from six sites with different gypsum contents (28-41) %. Laboratory tests include performing CBR and DCP tests in a cylindrical mold. A statistical analysis of the results shows that gypsum content is an affecting factor on DCP and good CBR-DCP correlations on gypsum content were obtained.

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Section: Laboratory Testsmentioning

confidence: 99%

Application of Dynamic Cone Penetration Test to Gypseous Soils

Al-Obaidi

Al-Ashoishi

2018

Tikrit j. eng. sci.

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“…The improvement is greater for sample S 3 where v = 27 %. This may be attributed to the presence of gypsum fragments within these soils, whose crystallization structures have extremely strong structural bonds, but are very brittle and are irreversibly destroyed by mechanical action during the loading stage (Petrukhin and Arakelyan 1985;AlQaissy 1989).…”

Section: Compression Testmentioning

confidence: 99%

Treatment of Collapsibility of Gypseous Soils by Dynamic Compaction

2012

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Gypseous soils are distributed in vast areas and various regions of Iraq and other countries. Many foundation failure problems that occur in these soils are associated with percolation of water and dissolution of gypsum. Many attempts were made by several researchers to treat and improve the properties of gypseous soils to decrease the dissolution of gypsum and collapse potential of these soils. The purpose of the present work is to investigate the effect of dynamic compaction process on the behaviour of gypseous soils. Extensive laboratory tests are carried out to study the geotechnical properties and the behaviour of three gypseous soils of different gypsum contents; 60.5, 41.1 and 27 %. The tests included compaction characteristics, compressibility, and collapsibility tests for samples tested before and after treatment by dynamic compaction process under different number of blows, falling weights and heights of falling of the weights. Three weights are used to compact the samples, namely; 2, 3 and 5 kg. The number of blows is varied between 20 and 40, while three heights of drop are tried (35, 50 and 65) cm. The results showed that the best improvement in compressibility is achieved when the sample is compacted by 20 blows; above this number a negligible decrease in the compression index C C is obtained. As the gypsum content increases, the dynamic compaction has greater effect on improvement of compressibility of the soil, while as the height of drop increases, the compression index C C decreases.

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“…Leaching of clayey soil in triaxial cell is a very difficult task because of high labor outlay and lengthy nature of this process (Petrukhin and Arakelyan 1984). This process is relatively easier for short samples such as oedometer or direct shear samples.…”

Section: Test Constrainsmentioning

confidence: 99%

Leaching of Lisan Marl and its consequences on the engineering behavior of dikes, studied by finite elements modeling

et al. 2009

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Leaching of Lisan Marl, Dead Sea, Jordan increased the soil compressibility and cohesion intercept. Back analysis using the Plaxis finite element code was successfully implemented. The Finite element modeling of dike construction showed a significant increase of total settlement and negligible effect on the strength as calculated by the u/c reduction method. The height of dikes to be constructed on Lisan Marl as foundation material, should be optimized to account for the effect of soluble salts leaching. For this to take place, an accurate calculation of settlement is crucial.

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Strength of gypsum-clay soils and its variation during the leaching of salts

Cited by 11 publications

References 0 publications

Application of Dynamic Cone Penetration Test to Gypseous Soils

Application of Dynamic Cone Penetration Test to Gypseous Soils

Treatment of Collapsibility of Gypseous Soils by Dynamic Compaction

Leaching of Lisan Marl and its consequences on the engineering behavior of dikes, studied by finite elements modeling

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