CLC number: P642.22
On-line Access: 2021-11-17
Received: 2021-04-24
Revision Accepted: 2021-05-29
Crosschecked: 2021-10-19
Cited: 0
Clicked: 4343
Citations: Bibtex RefMan EndNote GB/T7714
Chuan-xiang Qu, Gang Wang, Ke-wei Feng, Zhen-dong Xia. Large deformation analysis of slope failure using material point method with cross-correlated random fields[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2100196 @article{title="Large deformation analysis of slope failure using material point method with cross-correlated random fields", %0 Journal Article TY - JOUR
基于互相关随机场的物质点法边坡大变形破坏研究创新点:1. 通过在均质土坡中的分析,揭示了网格大小、强度折减形状因子和残余强度对物质点法模拟中边坡安全系数及失稳后特征的影响;2. 基于蒙特卡洛模拟,明确了粘聚力与摩擦角的互相关性对边坡失稳概率以及失稳后特征的影响,从而定量地评估了边坡失稳的潜在风险; 3.对比分析了随机物质点法与随机有限元法在模拟边坡失稳变形中的差异. 方法:1. 通过物质点法确定性地分析网格大小、强度折减形状因子和残余强度对均质土坡模拟结果的影响;2. 使用随机物质点法,评估不同粘聚力与摩擦角互相关系数下边坡的失稳概率、失稳后特征以及相应的失稳风险;3. 比较分析随机物质点法与随机有限元法在边坡失稳变形模拟中的差异. 结论:1. 在随机物质点法模拟中,边坡的失稳概率随粘聚力与摩擦角互相关系数的增大而显著增大,而边坡失稳后特征随互相关系数的增大而略微增大(5%~10%).2. 当使用摩尔库伦应变软化模型时,物质点法会面临网格依赖性问题;网格越密,计算的边坡安全系数与失稳特征均趋向收敛,但相应的计算时间显著增大;考虑到计算的效率与准确性,对于本文案例,0.5 m大小的网格较优.3. 当网格大小一定时,强度折减形状因子和残余强度会影响物质点法的计算结果;在本案例中,相较于残余粘聚力,残余摩擦角对边坡的失稳后特征影响更大.4. 随机物质点法与随机有限元法所计算出的边坡失稳概率相近,说明两种方法均适用于模拟边坡失稳中的小变形,同时也说明0.4 m的位移失稳准则在物质点法计算中可替代传统的安全系数来判断边坡失稳的发生.5. 需要注意的是随机有限元法可能严重地低估边坡的失稳风险;这主要是因为当网格发生畸变时,随机有限元法将会终止计算,从而无法模拟边坡的大变形破坏;对于随机物质点法,其可以有效地模拟边坡失稳的全过程. 关键词组: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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