Influence of hydraulic-mechanical coupling and dry-wet cycle effect on surficial layer stability of residual soil slopes

Xutang XU; Zhenxing XIAN; Feng YANG; Daoqi LIU; Wenbin JIAN; Xiang XU; Lianjin SHAO

doi:10.16031/j.cnki.issn.1003-8035.202102018

Volume 33 Issue 4

Aug. 2022

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The Chinese Journal of Geological Hazard and Control > 2022 > 33(4): 28-36. > DOI: 10.16031/j.cnki.issn.1003-8035.202102018

XU Xutang, XIAN Zhenxing, YANG Feng, et al. Influence of hydraulic-mechanical coupling and dry-wet cycle effect on surficial layer stability of residual soil slopes[J]. The Chinese Journal of Geological Hazard and Control, 2022, 33(4): 28-36. DOI: 10.16031/j.cnki.issn.1003-8035.202102018

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Influence of hydraulic-mechanical coupling and dry-wet cycle effect on surficial layer stability of residual soil slopes

1.
College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University , Fuzhou, Fujian　350108, China
2.
Institute of Geotechnical and Geological Engineering, Fuzhou University, Fuzhou, Fujian　350108, China

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Received Date: December 13, 2021
Revised Date: April 06, 2022
Available Online: July 24, 2022

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Abstract

Abstract

During rainfall infiltration, soil suction decreased and volume changed significantly. Since the natural shallow soil was under the influence of seasonal climate changes for a long time, numerical analysis of the influence of hydraulic-mechanical coupling and dry-wet alternation on the stability of shallow residual soil slopes was carried out. The temporal and spatial evolution law of pore water pressure, wetting front and safety factor of shallow soil slopes were analyzed deeply, then, the failure mechanisms of soil slopes under hydraulic-mechanical coupling and alternating dry-wet conditions were further discussed. Results show that with the increase of dry-wet cycles, the migration velocity of wetting front and pore water pressure increased more quickly, and the slope was more unstable under hydro-mechanical coupling analysis. At the early stage of the dry-wet cycle, the infiltration of rainwater would easily cause the groundwater level to rise, and the slope might lose its stability due to the increase of positive pore water pressure. In the later stage of dry-wet cycle, the rapid advance of wetting front accelerated the rapid loss of matrix suction and the decrease of soil strength, the safety factor of slope was significantly reduced and the time of failure was shorter. Therefore, the safety factor (local minimum) at the wetting front could be used as the critical value to control the long-term stability of the slope.
- hydro-mechanical coupling,
- dry-wet cycle,
- residual soil slope,
- wetting front,
- safety factor,
- long-term stability

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References

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