摘要
针对土石混合边坡破坏失效问题,提出了一种结合随机场理论与物质点法(Material Point Method,MPM)的随机物质点法(Random Material Point Method,RMPM)建模计算框架,用于模拟土体强度参数空间变异性对边坡大变形破坏过程的影响。基于指数型自相关函数和乔列斯基分解生成了2000组土基质粘聚力随机场,模拟了土石混合边坡的随机破坏模式。结果表明:相较于均质边坡,土石混合边坡破坏程度更低,影响范围更小,表明块石的存在能有效提升边坡抗滑稳定性。考虑强度参数空间变异性的随机土石混合边坡相较于确定性模型,发生破坏规模更大的情况概率较高,表明空间变异性显著加剧了边坡失稳风险。
Landslide hazards have always been a critical issue in geotechnical engineering.Focusing on the failure mechanisms of soil-rock mixture slopes and proposes a stochastic modeling framework,termed the Random Material Point Method(RMPM),which integrates random field theory and the Material Point Method(MPM)to quantify the influence of spatial variability in soil strength parameters on large-deformation failure processes.By generating 2000 Realizations of cohesion random fields for the soil matrix based on an exponential autocorrelation function and Cholesky decomposition method,the stochastic failure patterns of soil-rock mixture slopes were simulated.The results demonstrate that compared to homogeneous slopes,soil-rock mixture slopes exhibit reduced failure severity and smaller impact zones,indicating that the presence of rock blocks effectively enhances slope stability.Furthermore,random soil-rock mixture slopes considering spatial variability of strength parameters show a higher probability of experiencing larger-scale failures compared to deterministic models,highlighting that spatial variability significantly exacerbates landslide risks.
作者
陈蓬旭
戚顺超
Chen Pengxu;Qi Shunchao(College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China)
出处
《吉林水利》
2025年第6期15-19,共5页
Jilin Water Resources
关键词
土石混合体
随机场
物质点法
滑坡
Soil-rock mixture
Random field
Material point method
Landslide
