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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。
Shanghai World Expo Expo Axis and underground complex Ⅰ section excavation area of about 22 000m2, is divided into deep third and shallow three-story, the center of the island with the slope of the excavation combined with the reverse construction method, Board support mold center island frame mold and the surrounding soil mode combination. The monitoring results of foundation pit stability and environmental impact show that this method can well control the impact of construction on the surrounding environment and ensure the normal operation of the adjacent station and its ancillary structures on the basis of ensuring the stability of foundation pit. The analysis shows that the phenomenon of continuous wall “kicking foot ” and the large settlement of the surrounding ground surface are related to the reduction of confined water, which may also be a characteristic of the impact of the construction of ultra-wide foundation pit on the surrounding environment.