Impact of wetting–drying cycles on hydro-mechanical behavior of an unsaturated compacted clay

Chen, Rui; Ng, Charles Wang Wai

doi:10.1016/j.clay.2013.09.018

Cited by 76 publications

(22 citation statements)

References 27 publications

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“…The irreversible shrinkage caused by the drying-wetting cycle increased with increasing the experienced maximum suction. Similar test results of expansive soil were reported by Chen and Ng (2013) with a drying-wetting cycle in relatively smaller suction range.…”

Section: Drying-wetting Testssupporting

confidence: 90%

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Hydromechanical behaviour of expansive soils with different suctions and suction histories

2016

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This paper presents a number of experimental results of suction-controlled triaxial tests on a compacted weakly expansive soil with different suctions and suction histories. In terms of suction control methods, the high suction level (from 3.29 MPa to 38 MPa) was realized by the vapor equilibrium technique and the low suction level (from 0 kPa to 800 kPa) was controlled by the axis translation technique. The results of triaxial tests indicate that the specimen with higher suction shows higher strength and smaller contractive and higher dilative volumetric strains and the average skeleton stress ratio (q/p') at failure deceases with increasing the suction in the high suction range (3.29 MPa ~38 MPa). Given that the suction during shearing is constant (e.g. 200 kPa), the specimen dried to higher suction in history shows higher strength and smaller contractive volumetric strain. Experimental results also show that high pre-applied suction (i.e., the maximum suction in the history) can lead to peak strength, post-peak softening and shear dilation. Three different methods (pressure plate, filter paper and vapor equilibrium methods) were employed to study the soil-water retention behaviour of the unsaturated expansive soil. The test results indicate that combining above three different methods is able to determine the soil-water characteristic curve in the entire suction range (0~367 MPa). Test results of the expansive soil also show that the void ratio keeps decreasing along with the increase of the suction in the entire suction range.

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Section: Drying-wetting Testssupporting

confidence: 90%

“…Only a few experimental tests have been conducted using suction controlled oedometer devices (e.g., Lloret et al 2003;Alonso et al 2005;Cuisinier and Masrouri, 2005;Nowamooz and Masrouri, 2008). For example, Chen and Ng (2013) conducted…”

Section: Introductionmentioning

confidence: 99%

Hydromechanical behaviour of expansive soils with different suctions and suction histories

2016

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“…However due to environmental effects, soils in nature are ceaselessly subjected to wetting-drying cycles. It has been showed that the number of wetting-drying cycles play an important role in the behavior of expansive soils (Chen, 2013). 4.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Soil Heave Stabization Using Salty Water Technique

Sideek

Bakr²

2019

Journal of Al-Azhar University Engineering Sector

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Cyclic of heave and settlement of expansive represent one of the main reasons to considerable damages of structures, roads and highways. In Egypt there are many areas containing such expansive soils especially at the arid and semi-arid lands. Some studies used salty water with various concentrations to minimize the swelling behaviour of expansive clayey soils. In this paper an evaluation for the effectiveness of this technique was carried out based on series of lab experimental tests. Prepared remolded samples were treated with different concentration of salt water and the swelling behaviour, engineering properties, and heave parameters were studied using one-dimensional oedometer test. The effect of potable water on the dried-pretreated sample with salty water was also investigated. The results of the study indicated that, salt water treatment may be unpractical technique. Inundation with salty water may apparently minimize soil heave, however, soil treatment should be applied all through the lifespan of the structure, otherwise, when dry treated soil is subjected to seepage of fresh water, it may yield higher swelling potential.

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“…The presence of cracks can significantly weaken the soil mechanical performance [22]. Chen and Ng (2013) concluded that the hydromechanical behavior of soil was significantly influenced by dry-wet cycle process [23]. Zha (2013) showed that, with the increase of dry-wet cycles, the unconfined compressive strength of soil increased first and then declined [24].…”

Section: Figure 1 Loess Slope Spalling Hazards In Loess Area Of Chinamentioning

confidence: 99%

Effect of Dry-wet Cycle on the Formation of Loess Slope Spalling Hazards

Zhang

2018

CivileJournal

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This paper investigates the effect of dry-wet cycle process on the formation of loess slope spalling hazards. Based on the CT scan tests and macroscopic fissures analysis, the fissure variation law of loess samples under different dry-wet cycle times were determined. Through the laboratory direct shear tests, the variation law of shear strength, cohesion and angle of internal friction of loess samples under different dry-wet cycle times and different dry-wet cycle water content variation ranges were discussed. The results show that the natural water contents of Luo-chuan loess were higher than Tong-chuan loess due to it’s higher contents of clay particles. With the increase of dry-wet cycle times, the internal fissure numbers of loess samples increased dramatically. The value of shear strength and cohesion of loess samples in two different areas decreased dramatically due to the increase of dry-wet cycle times. Higher water content variation ranges of dry-wet cycles leaded to lower shear strength of loess samples under the same dry-wet cycle times. Loess slope spalling hazards often happened due to the decrease of shear strength and the occurrence of internal fissures in loess induced by the dry-wet cycle process.

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Impact of wetting–drying cycles on hydro-mechanical behavior of an unsaturated compacted clay

Cited by 76 publications

References 27 publications

Hydromechanical behaviour of expansive soils with different suctions and suction histories

Hydromechanical behaviour of expansive soils with different suctions and suction histories

Assessment of Soil Heave Stabization Using Salty Water Technique

Effect of Dry-wet Cycle on the Formation of Loess Slope Spalling Hazards

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