Abstract: This paper presents an in-depth analysis and research on the stability characteristics of loess slopes under rainfall conditions. A stability analysis and evaluation system for loess slopes under rainfall conditions by using the mutation theory was established, and the stability of loess slopes under rainfall conditions was analyzed and evaluated. The orthogonal principle was applied to optimize and analyze the range of factors that affect the stability of loess slopes under rainfall conditions, including rainfall intensity, cohesion, internal friction angle, bulk density, slope angle, and slope height, in order to determine the degree of influence of each factor on the stability of loess slopes under rainfall conditions. The results show that rainfall intensity plays a major role in the stability analysis of loess slopes under rainfall conditions, but the inherent characteristics of loess slopes (such as internal friction angle, slope height, cohesion, etc.) have a greater impact on the stability of loess slopes under rainfall conditions; At the same time, this evaluation system avoids the limitations of a single numerical analysis method based on the Morgenstern Price method for analyzing the stability of loess slopes. It can comprehensively analyze and evaluate the comprehensive impact of various factors on the stability of loess slopes under rainfall conditions, in order to provide reference for the application of this system to analyze and evaluate the stability of loess slopes under complex conditions.

Key words: Loess Slopes, Mutation Theory, Rainfall Conditions, Orthogonal Test, Stability Analysis