大深度基坑不同施工方法对周围土体影响的比较与分析  

Comparison and analysis of soil deformation induced by different construction methods for large deep foundation pits

作　　者：高伟[1,2] 彭芳乐[1,2] 徐正良 崔勤 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海市城市建设设计研究院,上海200125

出　　处：《岩土工程学报》2008年第S1期526-531,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家科技支撑计划项目(2006BAJ27B02-02)

摘　　要：以上海某隧道风井工程为背景,讨论了气压沉箱和地下连续墙这两种工法对周围土体的影响程度。简要分析了气压沉箱与地下连续墙在大深度基坑工程中施工原理与工艺的差异性,并针对各自施工特点建立了可以定量评价基坑施工过程对周围土体影响的数值计算模型。通过弹塑性有限元计算比较分析了在基坑开挖各个阶段两种不同施工方法所引起的地表沉降、周围土体水平位移以及坑底隆起的分布情况。结果表明:与地下连续墙工法相比,利用气压沉箱技术的大深度基坑施工对周围土体环境影响较小,气压沉箱施工技术更适合大深度基坑的开挖与施工。Based on the construction of shield tunnel shafts in Shanghai,the effects of two construction methods,namely pneumatic caisson and diaphragm wall,on surrounding soil were discussed.The difference between these two methods in terms of the construction principles and technology for large deep foundation pits was analyzed,and the numerical models were proposed to quantitatively evaluate the influence of excavation on the surrounding soil based on the particular characteristics of these two methods.Through comparison of surface settlement,horizontal displacement of surrounding soil and pit upheaval at each excavation stage obtained from the elasto-plastic finite element analyses,the performances of these two methods mentioned above were analyzed.It is shown that the influence of pneumatic caisson construction on the surrounding soil is less than that of diaphragm walls,and the former is more suitable in large deep excavation construction.

关 键 词：气压沉箱 地下连续墙 大深度开挖 数值分析 

分 类 号：TU473.2[建筑科学—结构工程]