Abstract
Numerical simulation analysis and limit equilibrium methods are usually used in landslide stability analysis. In order to study the differences of calculation theory and results, this paper takes Huangmuya landslide as a case study. The field geological survey and exploration are used to determine the form and property of the landslide. The deformation characteristics and stability state are comprehensive analyzed based on the information of macroscopic inspection and professional monitoring data. It is considered that the potential slip zone of the landslide has not obviously deteriorated, and the induced formation mechanism of the landslide mainly comes from the process and deformation of the upper slip mass. Through the analysis, FLAC3D is applied to simulate the stability of Huangmuya landslideis. The numerical simulation results show that the displacement of the slope will further increase, mainly concentrated in the middle and leading edge of the slip mass. Besides, stability coefficients are calculated by five limit equilibrium methods. The relationship of stability coefficients is as follows: transfer coefficient method > Low method > US Army Corps of Engineers method > M-P method > Janbu method. Based on the numerical simulation results, it is recommended to give priority to the US Army Corps of Engineers method, Low method or M-P method as the stability calculation method because the deviation amount is all within±2%.
Highlights
Limit equilibrium methods are widely used for landslide stability analysis based on their convenience and high efficiency, including transfer coefficient method, US Army Corps of Engineers method, Low method, Janbu method and Morgenstern-Price method (M-P method)
In order to judge the degree of deviation between the stability coefficient calculation results of different limit equilibrium methods and the numerical simulation analysis, the deviation amount is calculated according to formula (1), and the calculated results are shown in figure 4
The calculation results of the stability coefficient of the US Army Corps of Engineers method, Low method and M-P method are close to the results of the numerical simulation analysis, and the deviation amount is all within ±2%
Summary
Limit equilibrium methods are widely used for landslide stability analysis based on their convenience and high efficiency, including transfer coefficient method, US Army Corps of Engineers method, Low method, Janbu method and Morgenstern-Price method (M-P method). Many researchers have researched the relationships between analysis results [2, 3] and optimized limit equilibrium methods [4, 5]. Numerical simulation analysis have been one of main methods of landslide stability analysis while high-speed developing of computer. The stability of Huangmuya landslide is analyzed by limit equilibrium methods and numerical simulation adopted FLAC3D software, combined with the results of professional monitoring. The relationships between stability coefficient calculation results are pointed out to verify the accuracy of limit equilibrium methods. Zhao Changjun et al.: Study on the Difference of Stability Calculation Between Numerical Simulation Analysis and
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