Volume change behaviour of a swelling soil compacted at different initial states

Nowamooz, Hossein; Jahangir, Emad; Masrouri, Farimah

doi:10.1016/j.enggeo.2012.11.010

Cited by 36 publications

(16 citation statements)

References 23 publications

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“…The same phenomenon exists in the other domains of the soil mechanics. For example, during the investigation of the effect of cyclic wetting and drying on the characteristics of clays, Al-Homoud et al (1995), Basma et al (1996) and Nowamooz et al (2013) showed that the first cycle caused the most reduction in swelling potential and observed that the amount of shrinkage for the first cycle was the largest and steadily decreased in later cycles. They explained it by more important modification in the clay structure after the first cycle than the subsequent cycles.…”

Section: Discussionmentioning

confidence: 99%

Pressuremeter test parameters of a compacted illitic soil under thermal cycling

et al. 2017

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The incorporation of heat exchangers into geostructures leads to changes in the temperature of the adjacent soil. Important issues arise about the effect of temperature variations on hydro-mechanical soil behaviour. The objective of this paper is to improve the understanding and the quantification of the impact of temperature variation on the bearing capacity of thermo-active piles. Currently, the design of the deep foundations is based on the results of in situ penetrometer or pressuremeter tests while there is no published data on the effect of temperature on in situ tests results allowing to specifically assess thermo-active piles behaviour. Herein, an experimental device is developed to carry out mini-pressuremeter tests under controlled laboratory conditions. Mini-pressuremeter tests are performed on an illitic soil in a thermoregulated metric scale container subjected to a range of temperature from 1 to 40 °C. The results showed a slight decrease in the pressuremeter modulus (Ep) and a significant decrease in the creep pressure (pf) and the limit pressure (pl) as the temperature 2 increased. The results showed also the reversibility of this effect during a heatingcooling cycle through the investigated temperature range, while the effect of a coolingheating cycle was only partially reversible. In the case of several thermal cycles, the effect of the first cycle proved to be decisive on the soil parameters.

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Section: Discussionmentioning

confidence: 99%

Pressuremeter test parameters of a compacted illitic soil under thermal cycling

et al. 2017

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“…[1][2][3]. Freezing-thawing [4,5] and wettingdrying cycling [6][7][8] is one of the most destructive phenomena with regard to infrastructure damage. However, the results of some research on the effects of wetting-drying cycles on the stability and durability of soils depend on the percentage of stabilizer, test methods, the type of soil, and the cure conditions used [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Impact of wetting—drying cycles on the mechanical properties of lime-stabilized soils

Maafi

Akchiche

Rı́os

2019

Int. J. Pavement Res. Technol.

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This article addresses the results of an experimental study on the behavior of soil; this soil was exposed to long -term treatment with lime and numerous wetting-drying cycles. This research investigated the effect of a wide range of lime contents on the soil volume, soil water content evolution and durability (unconfined compressive strength (UCS), plasticity index (PI) and cation exchange capacity (CEC)) for stabilized s oil in contact with water. This experimental study was performed on soil treated with lime (varying from no lime to 8%) corresponding to three levels of improvement: soil improvement only, stabilization and insensitivity to water, and long-term stabilization during wetting-drying cycles. The results indicated that the UCS increases, PI and CEC decreases with the lime level. For lime levels above 4%, the behavior of the treated soil under wetting -drying was satisfactory. Mineralogical analyses indicated that the formation of calcium silicate hydrate C-S-H, ettringite C-S-A-H is responsible for the increased or decreased strength of the treated soil. CaO, SiO2 and Al2O3 were three important minerals responsible for the increase or decrease in soil sample stabilization. Simple model executed in JMP statistical software was proposed and validated. We note that CaO and SiO2 have the most influential effects by very low values of probability for the responses studied, which confirms the hypothesis of that these models can be used to model UCS and PI in curing time and wett ing-drying cycles.

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“…In recent years, there have been many studies on the effect of drying and wetting cycles on soil strength. A literature review on hydraulic cycles shows that several dryingwetting cycles [2][3][4] produce an equilibrium state after which the soil exhibits elastic behavior. Moreover, the irreversible volumetric deformation during the drying and wetting cycles was found to be the function of compaction conditions and the subsequent variation of stress/hydration paths [5,6].…”

Section: Introductionmentioning

confidence: 99%

Influences of Drying and Wetting Cycles and Compaction Degree on Strength of Yudong Silt for Subgrade and Its Prediction

Zhang

Jiang

Wang

et al. 2018

Advances in Civil Engineering

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In order to investigate the influences of drying and wetting cycles, initial degree of compaction, and water content on shear strength of the Yudong subgrade silt, a series of direct shear tests were performed at saturated and unsaturated states. The test results show that effects of the drying and wetting cycles, water content, and compaction degree on cohesion are more evident than those on the internal friction angle. According to the test data, a formula for the cohesion was proposed, which accounts for the drying and wetting cycles, water content, and degree of compaction. Because Bishop’s strength formula for unsaturated soils could not be applied to Yudong silt, a formula is given based on Fredlund’s formula for predicting the shear strength of unsaturated Yudong silt from the soil-water characteristic curve.

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Volume change behaviour of a swelling soil compacted at different initial states

Cited by 36 publications

References 23 publications

Pressuremeter test parameters of a compacted illitic soil under thermal cycling

Pressuremeter test parameters of a compacted illitic soil under thermal cycling

Impact of wetting—drying cycles on the mechanical properties of lime-stabilized soils

Influences of Drying and Wetting Cycles and Compaction Degree on Strength of Yudong Silt for Subgrade and Its Prediction

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