防灾减灾工程学报2024，Vol.44Issue(3)：705-714,10.DOI:10.13409/j.cnki.jdpme.20221002001
基于隆起变形分析的基坑坑底抗隆起稳定可靠度分析
Reliability Assessment of Basal-heave Stability Based on Deformation Analysis
摘要
Abstract
A numerical model of excavation was established in PLAXIS 2D using the Hardening Soil model.Based on the heaving deformation data at characteristic points at the bottom of the excavation,a limit state function corresponding to the over-limit failure mode of heaving deformation was con-structed.To enhance the computational efficiency,the response surface method(RSM)was em-ployed,replacing finite element calculations to quickly derive heaving deformation values at the char-acteristic points.Combined with the Monte Carlo simulation method(MCS),the reliability of the anti-heaving stability at the bottom of the excavation was conducted.The results show that the variability in the unloading-reloading modulus(Eur3)and effective internal friction angle(φ'3)of the third soil layer significantly impacted basal-heave stability.The variability in the effective cohesion(c'1),effective in-temal friction angle(φ'1),secant modulus(E501)and tangential modulus(Eoed1)of the first soil layer and the effective cohesion of the second soil layer(c'2)had a smaller impact on basal-heave stability.How-ever,the effective cohesion of the second soil layer(c'2)exhibited a relatively large influence on basal-heave stability.For deep excavations with silty soils at the base,reinforcing the soil within the excava-tion effectively constrains base heaving deformation.关键词
基底隆起稳定性/硬化土模型/响应面/蒙特卡罗法Key words
Basal-heave stability/hardening soil model/response surface method/Monte Carlo simula-tion method分类
建筑与水利引用本文复制引用
孟凯琪,刘志良,徐亮,李春立,李亮,于忠福,高原,李辉..基于隆起变形分析的基坑坑底抗隆起稳定可靠度分析[J].防灾减灾工程学报,2024,44(3):705-714,10.基金项目
国家自然科学基金项目(51778313)资助 （51778313）
