城市地下综合管廊基坑开挖支护关键技术研究

Research on Key Technologies for Excavation and Support of Urban Underground Comprehensive Pipe Gallery Foundation Pit

文中针对现有基坑开挖支护设计方法,结合工程案例进行分析,指出现有设计软件存在的缺陷,并采用有限元分析方法进行补充分析。结果表明:(1)绕支撑的踢脚破坏稳定性在城市地下综合管廊基坑支护设计中起控制作用;(2)考虑坑底地基土体加固处理后,支护内力、变形以及坑内外土体变形均大幅减小。

Based on the existing design methods for excavation and support of foundation pits,combined with engineering cases,the shortcomings of existing design software were analyzed,and finite element analysis method was used to supplement them.The analysis results indicate that:1.The stability of the skirting around the support plays a controlling role in the design of urban underground comprehensive pipe gallery foundation pit support;2.After considering the reinforcement treatment of the foundation soil at the bottom of the pit,the internal force and deformation of the support,as well as the deformation of the soil inside and outside the pit,are significantly reduced.