Long-term stability analysis of loess cutting shallow slope based on wet-dry cycle test

SHI Yu-ling; CHANG Zhou; AN Ning; YAN Chang-gen; LAN Heng-xing; YANG Wang-li

doi:10.19818/j.cnki.1671-1637.2023.04.007

Volume 23 Issue 4

Aug. 2023

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Article Navigation > Journal of Traffic and Transportation Engineering > 2023 > 23(4): 104-115

SHI Yu-ling, CHANG Zhou, AN Ning, YAN Chang-gen, LAN Heng-xing, YANG Wang-li. Long-term stability analysis of loess cutting shallow slope based on wet-dry cycle test[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 104-115. doi: 10.19818/j.cnki.1671-1637.2023.04.007

Citation:

SHI Yu-ling, CHANG Zhou, AN Ning, YAN Chang-gen, LAN Heng-xing, YANG Wang-li. Long-term stability analysis of loess cutting shallow slope based on wet-dry cycle test[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 104-115. doi: 10.19818/j.cnki.1671-1637.2023.04.007

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Long-term stability analysis of loess cutting shallow slope based on wet-dry cycle test

doi: 10.19818/j.cnki.1671-1637.2023.04.007

1.
School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China
2.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
3.
Investment Management Company of China Construction Fifth Engineering Bureau, Changsha 410116, Hunan, China
4.
State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
5.
Gansu Luqiao Highway Investment Co., Ltd., Lanzhou 730030, Gansu, China

Funds:

National Natural Science Foundation of China 42077265

National Natural Science Foundation of China 41927806

Science and Technology Project of Gansu Provincial Department of Transportation 2021-19

More Information

Author Bio:
Shi Yu-ling(1972-), female, associate professor, PhD, dcdgx15@chd.edu.cn
Received Date: 2023-03-12
Available Online: 2023-09-08
Publish Date: 2023-08-25

Abstract

Abstract

To evaluate the shallow soil strength deterioration effect of loess slope under wet-dry cycle, the laboratory direct shear tests were carried out under different wet-dry cycle paths on Q₃ undisturbed loess from Dingxi, Gansu Province. The effects of cycling times, cycling amplitude and lower bound water content on the shear strength of the soil were analyzed. A strength degradation model considering three parameters of wet-dry cycle was established, and the long-term stabilities of loess cutting shallow slope under different wet-dry cycle paths were compared by the strength reduction method. Test results show that the cohesion of undisturbed loess first decreases and then tends to be stable with the increase of wet-dry cycles, which can be fitted by the hyperbolic function. The internal friction angle decreases linearly. After 10 cycles, the maximum deterioration degrees of cohesion and internal friction angle are 27.64% and 9.88%, respectively. Under the same wet-dry cycles, the degradation effects of the cycling amplitude on the cohesion and internal friction angle of undisturbed loess are greater than that of the lower bound water content. The long-term stability coefficient of loess cutting shallow slope follows an exponentially decreasing function during the wet-dry cycle. The maximum reduction of slope stability coefficient under different wet-dry cycle paths is 61.5%, and the reduction of stability coefficient accounts for 85% of the total reduction after 6 cycles. The stability of loess cutting shallow slope is affected by the cycling amplitude and lower bound water content in the wet-dry cycle, which shows that the slope stability increases first and then tends to be stable with the increase of lower bound water content. However, with the increase of cycling amplitude, the stability coefficient decreases linearly. In engineering practice, the water content varies with the depth in the slope, and the wet-dry cycle paths are different, so the layering effect of wet-dry cycle should be considered in long-term stability analysis of loess cutting slope.
- subgrade engineering,
- cutting slope,
- undisturbed loess,
- wet-dry cycle,
- deterioration degree,
- stability analysis

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References(31)

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Long-term stability analysis of loess cutting shallow slope based on wet-dry cycle test

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Long-term stability analysis of loess cutting shallow slope based on wet-dry cycle test

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