摘要
上海市世博会世博轴及地下综合体工程Ⅰ标段基坑开挖面积约22 000m2,分为深三层和浅三层两部分,采用中心岛放坡开挖并结合逆作法的施工工艺,中板支模采用中心岛搭架支模和周边土模相结合的方式。基坑稳定性及环境影响的监测结果表明,该方法在保证基坑稳定性的基础上,较好地控制了施工对周边环境的影响,保证了临近车站及其附属结构的正常运营。分析认为,连续墙"踢脚"现象和周围地表沉降较大与降低承压水有关,也可能为超宽基坑施工对周围环境影响的一种特征。
The area of the large-deep excavation of Shanghai Expo Axis and Underground Complex Project No.1 tendering section is about 22 000m^2.It could be divided into two parts,deep three-layered and shallow three-layered.The construction method of excavation adopted mid-island excavation associating with inverse method.The bracing framework of middle-slab adopted short stent in mid-island and soil form in surrounding area.Monitoring results of stability and influence of environment show that this method can not only ensure stability of excavation,but also decrease impact on the environment around and ensure normal operations of M8 Line.Large deformation of bottom diaphragm wall and settlement of ground surface are induced by pumping confined water and this phenomenon is maybe the deformation behavior of large excavation.
出处
《建筑结构》
CSCD
北大核心
2010年第4期89-91,共3页
Building Structure
基金
2010年安徽省高等学校省级自然科学研究项目(KJ2010B232)
关键词
岩土工程
深大基坑
逆作法
环境影响
geotechnical engineering
large-deep excavation
inverse method
influence of environment
