岩土工程学报2025，Vol.47Issue(8)：1561-1571,11.DOI:10.11779/CJGE20240330
软土基坑抗隆起稳定性的改进圆弧滑动法
Improved circular arc sliding method for basal heave stability of excavations in soft soils
摘要
Abstract
A large number of braced excavations in soft soils have shown that the safety factor of basal heave stability by using the circular arc sliding method suggested by the current codes in China is too large when the insertion ratio is small or large.Based on the finite element limit analysis,the existing problems in the current codes are deeply investigated.The variation mechanism of the safety factor of basal heave stability,the circular arc sliding radius and the anti-sliding moment of the retaining structures is clarified with the increase of the insertion ratio of the retaining structures.The formulas for calculating the upper and lower limits of the insertion ratio of the retaining structures are further established,and an improved circular arc sliding method for basal heave stability is proposed.The rationality of the improved method is verified through a comparative analysis of engineering cases.The improved method has addressed the existing problems in the current codes.It may provide a beneficial reference for the design of retaining structures in deep-braced excavations and the revision of the current codes.关键词
基坑/抗隆起稳定性/圆弧滑动法/极限分析有限元/安全系数Key words
excavation/basal heave stability/circular arc sliding method/finite element limit analysis/safety factor分类
建筑与水利引用本文复制引用
黄茂松,付臣志,时振昊..软土基坑抗隆起稳定性的改进圆弧滑动法[J].岩土工程学报,2025,47(8):1561-1571,11.基金项目
国家自然科学基金重点项目(51738010)This work was supported by the National Natural Science Foundation of China(Grant No.51738010). （51738010）
