Stability analysis of slopes based on dynamic strength reduction- improved vector sum method

WANG Siyuan; TONG Xiaodong

doi:10.11779/CJGE20220548

Volume 45 Issue 7

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Chinese Journal of Geotechnical Engineering > 2023 > 45(7): 1384-1392. > DOI: 10.11779/CJGE20220548

WANG Siyuan, TONG Xiaodong. Stability analysis of slopes based on dynamic strength reduction- improved vector sum method[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(7): 1384-1392. DOI: 10.11779/CJGE20220548

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Stability analysis of slopes based on dynamic strength reduction- improved vector sum method

WANG Siyuan^1,,
TONG Xiaodong^{1, 2, ,}

1.
School of Civil Engineering, Southeast University, Nanjing 211189, China
2.
Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education (Southeast University), Nanjing 211189, China

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Received Date: May 02, 2022
Available Online: February 23, 2023

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Abstract

Abstract

In the slope stability analysis, both the limit equilibrium method and the vector sum method assume that the slope instability is caused by shear failure, accordingly, it is difficult to correctly solve the safety factor of the complex slope with tensile failure at the upper part, while the global strength reduction method can obtain the safety factor, it is difficult to search for the complete sliding surface containing the tensile failure zone in the upper part of the slope. In view of the above problems, the dynamic strength reduction method is adopted to search for the sliding surface of slope, and an improved vector sum method which can take into account the tension failure and shear failure is proposed, so that the slope stability problem can be solved better. The results of three cases show that the dynamic strength reduction method can completely reflect the sliding surface of slopes, and the safety factor obtained by the improved vector sum method is basically the same as that by the global strength reduction method. The proposed method is applicable to the stability analysis of various types of slopes, such as soil, rock and soil-rock combinations, and is less affected by the main sliding direction, mesh size and model size, which helps to promote the further improvement of slope stability analysis methods.
- slope stability,
- tensile failure,
- dynamic strength reduction method,
- improved vector sum method

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References

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