Influence of drying/wetting cycles on the mechanical cyclic behaviours of silty clay

Liu, Wenhua; Tang, X.; Yang, Qing; Li, Wugang

doi:10.1080/19648189.2014.974833

Cited by 18 publications

(5 citation statements)

References 27 publications

(24 reference statements)

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“…Thang et al, 2019 identified four pivotal factors, including pore ratio, net stress, matrix suction, and saturation, which significantly influence the strain shear modulus. Liu et al investigated the effect of the initial dry density and historical drying stress on drying-wetting cycles (Liu et al, 2014;Liu et al, 2017). Wang et al concluded that the cutline modulus increases exponentially with initial compaction (Wang et al, 2016).…”

Section: Figurementioning

confidence: 99%

Deterioration mechanism of loess from Ili valley region of China under wet and dry cycles: evidences from shear tests

Lai,

Zhang,

Zhang

et al. 2023

Front. Earth Sci.

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The properties of loess in the Ili region of China are significantly affected by repeated cycles of rainfall and evaporation. It is thus essential to investigate the deterioration mechanism of loess subjected to the wet and dry cycles. This paper employs various methods, including the direct shear and triaxial shear tests, as well as the scanning electron microscopy (SEM), to evaluate the variation patterns of shear strength parameters and microstructure of Ili loess. The direct shear test was conducted on loess samples experiencing a limited number of wet and dry cycles (0, 1, 3, 5, 7, and 9), while the triaxial shear test focused on a more extensive range of wet and dry cycles (0, 1, 3, 10, 20, and 30). In parallel, the alterations in the shear strength parameters of the loess material under different shear tests were also scrutinized. The findings obtained from this research revealed that the shear strength of Ili loess decreased to varying degrees based on the two test methods when they are affected by the wet and dry cycles. Comparing the results with the same number of wet and dry times (0, 1 and 3 times), both the shear strength and cohesion obtained from the triaxial shear test were greater than those from the direct shear test, while the results for the angle of internal friction were reversed. Moreover, the scanning electron microscope tests on Ili loess did indicate that the micro-particle size, pore space, morphology, soil structure, and particle contact mode exhibited the deterioration with different degrees. The micro-structural change is believed to be the main reason for the deterioration mechanism of the shear strength. The research outcomes will enrich the understanding about the loess properties in Central Asia, providing data reference and theoretical basis for engineering construction in these region.

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Section: Figurementioning

confidence: 99%

Deterioration mechanism of loess from Ili valley region of China under wet and dry cycles: evidences from shear tests

Lai,

Zhang,

Zhang

et al. 2023

Front. Earth Sci.

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“…Cycles. At present, the common practice to achieve WD cycles is to soak the specimens in water to the target wet side moisture content and then place them in the oven to dry at high temperature to the target dry side moisture content [27,28]. Although this pattern speeds up the test process, the water absorption and dehydration of the specimens are obviously much faster than the actual water exchange rate of subgrade soils.…”

Section: Wetting-dryingmentioning

confidence: 99%

Influence of Humidity State on Dynamic Resilient Modulus of Subgrade Soils: Considering Repeated Wetting‐Drying Cycles

Xin¹,

Zhang

Wang³

et al. 2021

Advances in Materials Science and Engineering

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The service performance of subgrade depends on the dynamic resilient modulus (MR) of subgrade soils. Meanwhile, due to complicated conditions such as rainfall infiltration, high temperature evaporation, and groundwater level fluctuations, it can be safely said that the humidity state and repeated wetting-drying (WD) cycles affect the MR of subgrade soils. The object of this study is to conduct a series of dynamic triaxial tests after WD cycles to investigate the characteristics of the MR under various factors. The main results are as follows: (i) the MR decreased with the increase of deviator stress and rose with the growth of confining pressure; (ii) the humidification effect caused by the increase in moisture content attenuated the MR; (iii) the accumulation of WD cycles damaged the MR; however the decline rate was gradually retarded until it was stable with WD cycles 5 times; (iv) the satisfactory prediction model for the MR of subgrade soils considering WD cycles was proposed and verified. It is expected that the findings can provide valuable contributions for road engineering.

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“…Meng et al [9] studied the variation of sandstone's mechanical and acoustic emission parameters for different numbers of dry-wet cycles using uniaxial compression and acoustic emission tests and established the relationship between sandstone's mechanical and acoustic emission parameters. Liu et al [10] conducted uniaxial and triaxial compression tests on shaly sandstone for different dry-wet cycles, discussed the variation of its mechanical parameters, and used particle flow code (PFC) to simulate its force chain distribution and crack distribution after dry-wet cycling. Deng et al [11] used cyclic loading and unloading to simulate seismic effects.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dry–Wet Cycling on the Degradation Characteristics and Mechanisms of Red Sandstone

et al. 2023

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The physical and mechanical parameters and degradation mechanisms of red sandstone in the Mount Wuyi scenic area were studied under the action of dry–wet cycles. Dry–wet cycle, acoustic wave velocity, water saturation rate, and triaxial compression tests were conducted, aided by scanning electron microscopy and X-ray diffraction testing techniques. The study’s results show that the dry–wet cycle effect on red sandstone is a major factor in the degradation of its physical and mechanical parameters and that its microstructural characteristics are significantly affected. The P-wave velocity, peak strength, elastic modulus, internal friction angle, and cohesion decreased, the water content and peak strain increased, and the elastic modulus was the most sensitive to dry–wet cycles. A dry–wet cycle’s action severely damages the microstructural integrity of the red sandstone. After 15 dry–wet cycles, the interstitial fillings between the skeletal grains are dissolved over a large area, microfractures are interwoven throughout, and the structure is severely fragmented. The microstructural degradation of the red sandstone by dry–wet cycles mainly manifests in the dissolution of the interstitial filler, and the relative content of calcite as an interstitial filler is reduced by 46.6% after 15 dry–wet cycles. The proposed strength decay prediction equation has reference significance for the strength prediction of the red sand conglomerate in the project. This study’s results can provide theoretical support for the landscape protection of rock masses and the prevention of engineering geological hazards.

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Influence of drying/wetting cycles on the mechanical cyclic behaviours of silty clay

Cited by 18 publications

References 27 publications

Deterioration mechanism of loess from Ili valley region of China under wet and dry cycles: evidences from shear tests

Deterioration mechanism of loess from Ili valley region of China under wet and dry cycles: evidences from shear tests

Influence of Humidity State on Dynamic Resilient Modulus of Subgrade Soils: Considering Repeated Wetting‐Drying Cycles

Effect of Dry–Wet Cycling on the Degradation Characteristics and Mechanisms of Red Sandstone

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