The extensive distribution and complex material composition of soil-rock mixture slopes in China have at-tracted significant attention from scholars.[Objective]This study aims to scientifically and rationally assess the impact of the spatial variability of soil parameters on the stability of soil-rock mixture slopes.[Methods]Based on the random field theory,the effective shear strength parameters cohesion c and internal friction angle φ are selected as random variables.The local averaging method is used to simulate the random field,with random field parameter generation conducted in MATLAB.Python scripts are employed to map the random field parameters to the soil-rock mixture slope via finite element software,accounting for the actual shape and content of block rocks in the soil-rock mixture.The strength reduction method is then applied to calculate the slope stability safety factor.[Results]The results reveal that the stability safety factor of soil-rock mixture slopes follows a normal distribution.As the block stone content increases,the mean value of the stability safety factor rises from 1.005 to 1.095,reflecting a transi-tion from shallow to deep failure.For block stone content of 35％,the stability safety factor reaches 1.334 for larger block stones and 1.064 for smaller ones.Compared to deterministic calculation results,incorporating the spatial variability of the soil parameters yields higher stability safety factor.[Conclusion]Therefore,in soil-rock mixture slope stability analyses,the spatial variability of effective shear strength parameters must be fully considered to pre-vent overly conservative designs.
关键词
土石混合体/随机场理论/边坡稳定性分析/有限元法/强度折减法
Key words
soil-rock mixture/random field theory/slope stability analysis/finite element method/strength reduc-tion method
维普
万方数据