上海国土资源2025，Vol.46Issue(2)：54-64,11.DOI:10.3969/j.issn.2095-1329.2025.02.008
考虑接触面侧摩阻力的地铁基坑抗承压水稳定性分级设计原则
Stability classification and design principles for metro foundation pits under confined water with side friction resistance
摘要
Abstract
This study resolves the discrepancies between stability analysis results derived from current dewatering design standards for foundation pits and actual confined-water-induced accidents.By differentiating between local weak points at interfaces and overall pit risk characteristics,we systematically analyze emergency response capabilities under varying stability coefficients against confined water,thereby establishing a four-tier design framework for confined water control in metro foundation pits.For Tier IV criteria(aquifer burial depth≥25 m and stability coefficient>0.8),we investigate pit scale characteristics and propose a stability criterion incorporating interface side friction resistance.Comparative analysis of historical metro excavation surge cases reveals prediction deviations of-33%and 42%for conventional pressure balance and shear strength methods,respectively.The proposed simplified discriminant reduces deviations to within 8%,significantly improving failure prediction accuracy.Engineering validation under 15-day sustained excavation with a stability coefficient of 0.86(non-dewatering conditions)demonstrated no safety incidents,yielding a modified stability coefficient of 1.39.This confirms the method's effectiveness and reliability in confined-water stability analysis.Implementation of this framework reduces construction risks,engineering costs,accident probability,and environmental impacts,demonstrating significant benefits across social,economic,and environmental dimensions.The research provides critical theoretical foundations and technical paradigms for analogous geotechnical engineering applications.关键词
承压水控制/基坑突涌/抗承压水稳定性系数/接触面/侧摩阻力/抗剪强度Key words
confined water control/excavation surge/stability coefficient against confined water/contact surface/side friction resistance/shear strength分类
天文与地球科学引用本文复制引用
陆建生..考虑接触面侧摩阻力的地铁基坑抗承压水稳定性分级设计原则[J].上海国土资源,2025,46(2):54-64,11.基金项目
上海市科委科研计划(20DZ2250800) （20DZ2250800）
