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# A Calculation Method of Double Strength Reduction for Layered Slope Based on the Reduction of Water Content Intensity

Feng Shen1,*, Yang Zhao1, Bingyi Li1, Kai Wu2

1 School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, 215011, China
2 R&D Department, Suzhou Jcon Greenbuild Fabricated Co., Ltd., Suzhou, 215004, China

* Corresponding Author: Feng Shen. Email:

Computer Modeling in Engineering & Sciences 2024, 138(1), 221-243. https://doi.org/10.32604/cmes.2023.029159

## Abstract

The calculation of the factor of safety (FOS) is an important means of slope evaluation. This paper proposed an improved double strength reduction method (DRM) to analyze the safety of layered slopes. The physical properties of different soil layers of the slopes are different, so the single coefficient strength reduction method (SRM) is not enough to reflect the actual critical state of the slopes. Considering that the water content of the soil in the natural state is the main factor for the strength of the soil, the attenuation law of shear strength of clayey soil changing with water content is fitted. This paper also establishes the functional relationship between different reduction coefficients. Then, a USDFLD subroutine is programmed using the secondary development function of finite element software. Controlling the relationship between field variables and calculation time realizes double strength reduction applicable to the layered slope. Finally, by comparing the calculation results of different examples, it is proved that the stress and displacement distribution of the critical slope state obtained by the improved method is more realistic, and the calculated safety factor is more reliable. The newly proposed method considers the difference of intensity attenuation between different soil layers under natural conditions and avoids the disadvantage of the strength reduction method with uniform parameters, which provides a new idea and method for stability analysis of layered and complex slopes.

## Keywords

Shen, F., Zhao, Y., Li, B., Wu, K. (2024). A Calculation Method of Double Strength Reduction for Layered Slope Based on the Reduction of Water Content Intensity. CMES-Computer Modeling in Engineering & Sciences, 138(1), 221–243.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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