Journal Article•
Centrifuge model test on stability of expansive soil slope under alternation between drying and wetting
TL;DR: A series of geotechnical centrifuge model tests were carried out to study the influences of alternation between drying and wetting on the deformation and stability of the expansive soil slope as mentioned in this paper.
Abstract: A series of geotechnical centrifuge model tests were carried out to study the influences of alternation between drying and wetting on the deformation and stability of the expansive soil slope.The influences of cracks and infiltration on the stability of expansive soil slope were analyzed and the mechanism of the failure of expansive soil slope was investigated.
Citations
More filters
TL;DR: In this paper, a full-scale model test was conducted on a cracked soil slope under rainfall-evaporation cycles, and the results showed dynamic variations in the desiccation crack patterns in accordance with their position on the slope and the rainfall and evaporation cycle.
29 citations
TL;DR: In this article, the wetting-drying effect of expansive soil plays an important role in slope stability analysis, and the results may provide the reference for the parameter selection in slope design.
Abstract: The wetting-drying effect of expansive soils plays an important role in slope stability analysis. According to the depth of atmospheric effect and the field observation data of moisture content, laboratory experiments on the strength of expansive soil with two wetting-drying cycle amplitudes were performed to discuss on the wetting-drying effect of expansive soil. The results show that the shear strength of expansive soil decreases with increasing number of cycles and finally reaches to a constant state. The value and cycle number of the constant state reduce with increase of amplitude of variation of water content. Furthermore, the stability analysis of expansive soil slope is studied with considering the wetting-drying effect. The results may provide the reference for the parameter selection in slope design.
13 citations
TL;DR: In this article, the effects of strength attenuation, seepage softening, and moistening expansion on the overall stability of the expansive soil slope were analyzed, and the results showed that the failure mode of the slope after multiple dry-wet cycles is shallow collapse and the failure surface is located in the weathered area.
Abstract: Expansive soil is a kind of clay soil that expands rapidly after being immersed in water and shrinks significantly after losing water. The expansive soil slopes exposed to the atmosphere are in the process of continuous dry and wet cycles and are extremely unstable under the conditions of rainfall. Based on saturated-unsaturated seepage theory, the unsaturated seepage process and humidification process of the expansive soil slope under rainfall were simulated, and a related FORTRAN language program was developed. The effects of matrix suction changes, seepage softening, and moistening expansion during the seepage process were considered. The effects of strength attenuation, seepage softening, and moistening expansion on the overall stability of the expansive soil slope were analyzed. The results show that under the action of rainfall, the failure mode of the expansive soil slope after multiple dry-wet cycles is shallow collapse, and the failure surface is located in the weathered area, which is quite different from the traction landslide of the homogeneous expansive soil slope. After considering the moistening expansion and softening effects, the maximum displacement of the slope increased by an order of magnitude, and the safety factor decreased significantly. The significant increase in the horizontal stress of the lower half slope is the main reason for the landslide. The research results well explain the special tractive and shallow properties of typical expansive soil landslides.
11 citations
Cites methods from "Centrifuge model test on stability ..."
...Wang Guoli [7] used a centrifugal model test to study the stability of expansive soil slope under the condition of dry and wet cycles....
[...]
TL;DR: The problem of expansive soil crack has gradually become a research hotspot, it elaborates the occurrence and development of cracks from the basic properties of expansive land, and points out the role of controlling the crack of expansive soils strength.
Abstract: Engineering problems shunned previously rise to the surface gradually with the activities of reforming the natural world in depth, the problem of expansive soil crack under the changing environment becoming a control factor of expansive soil slope stability. The problem of expansive soil crack has gradually become a research hotspot, elaborates the occurrence and development of cracks from the basic properties of expansive soil, and points out the role of controlling the crack of expansive soil strength. We summarize the existing research methods and results of expansive soil crack characteristics. Improving crack measurement and calculation method and researching the crack depth measurement, statistical analysis method, crack depth and surface feature relationship will be the future direction.
9 citations
TL;DR: Based on Palmgrem-Miner linear accumulative damage theory, laboratory experiments on the strength of expansive soil combining with different wetting-drying cycle amplitudes were performed as discussed by the authors.
Abstract: The shear strength of expansive soil has the obvious varying property with the changing of seasonal climatic. Based on Palmgrem-Miner linear accumulative damage theory, laboratory experiments on the strength of expansive soil combining with different wetting-drying cycle amplitudes were performed to discuss on the fatigue accumulative damage of expansive soil in the alternation of wetting-drying environment. The results show that：(1)The applying sequence of high (low) cycle amplitudes have significant effect upon the fatigue accumulative damage of expansive soil, and the strength attenuation of expansive soil is mainly controlled by the high circulate amplitude. (2) The Palmgrem-Miner linear accumulative damage criterion can basically reflect the fatigue accumulative damage process of expansive soil in the alternation wetting-drying environment, and the value of damage score “D” is close to 1 when the strength of expansive soil is stabled.
2 citations
Cites background from "Centrifuge model test on stability ..."
...In the last decade, many researches had been conducted on the engineering properties of expansive soil in drying-wetting cycle through various laboratory tests ([3-7])....
[...]