Stability calculation and numerical simulation of multi-stage high loess slopes

YANG Xiao-hui; LU Fa; GUO Nan; ZHU Yan-peng; ZHOU Shuai-kang

doi:10.11779/CJGE2022S1031

Volume 44 Issue S1

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Chinese Journal of Geotechnical Engineering > 2022 > 44(S1): 172-177. > DOI: 10.11779/CJGE2022S1031

YANG Xiao-hui, LU Fa, GUO Nan, ZHU Yan-peng, ZHOU Shuai-kang. Stability calculation and numerical simulation of multi-stage high loess slopes[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 172-177. DOI: 10.11779/CJGE2022S1031

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Stability calculation and numerical simulation of multi-stage high loess slopes

YANG Xiao-hui^{1, 2,},
LU Fa^{1, 2},
GUO Nan^{1, 2},
ZHU Yan-peng^{1, 2},
ZHOU Shuai-kang^{1, 2}

1.
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050

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Received Date: September 24, 2022
Available Online: February 06, 2023

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Abstract

Abstract

One of the core problems faced by a large number of slope support projects in Northwest China is the stability analysis of multi-stage high slopes. However, most of the existing stability analysis methods are for the sigle-stage high slopes. Based on the Swedish slice method, a method for stability calculation of multi-stage high loess slopes and the relevant sliding surface search model are proposed. The stability algorithm is analyzed by means of the MATLAB software programming and thefinite element simulation. The results show that: (1) The proposed method and the relevant sliding surface search model can be used to evaluate the overall stability of the multi-stage slopes and modified according to the sensitivity analysis. (2) According to the sensitivity analysis, the slope height and the slope ratio are the primary factors to be considered in the design of its grade. At the same time, with the decrease of the gravity, the increase of the cohesion and the increase of the friction angle, the slope stability will be improved. (3) Through the finite element simulation software, it is found that the sliding surface obtained by the proposed sliding surface search model is more accurate, and the sliding surface of the slope has moved back after the support. (4) According to the support case of multi-stage loess slope, it is found that the stress of the joint between the anti-slide piles and the prestressed anchor cable of the frame and the soil in front of the anti-slide piles is high, and the axial tension of the anchor cable in the lower row is large, which should be emphasized in the design of similar projects. The above research results may provide scientific basis for the stability analysis of multi-stage high loess slopes.
- multi-stage high loess slope,
- stability calculation,
- sliding surface search model,
- sensitivity analysis,
- numerical simulation

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References

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