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城市地下空间开发中,在已有地铁隧道附近进行深基坑开挖存在较大的工程风险。地下结构穿越既有地铁隧道设施施工难度更大。针对某大型深基坑“两墙合一”的地下连续墙结构穿越既有地铁隧道临时施工竖井的特殊工程,综合分析特定场地条件和施工难点等主要矛盾,在确保地下连续墙满足工程需要和隧道变形控制要求等环境影响的前提下,采取一系列有效施工技术措施,最终实施效果良好。
In the development of urban underground space, there is a big engineering risk in excavation of deep foundation pit near existing subway tunnels. Underground structures through the existing subway tunnel construction facilities more difficult. For a large deep foundation pit “two walls together ” underground continuous wall structure through existing subway tunnel temporary construction shaft special project, comprehensive analysis of specific site conditions and construction difficulties and other major contradictions in ensuring that the diaphragm wall to meet the project Needs and tunnel deformation control requirements under the premise of environmental effects, to take a series of effective construction techniques and measures, the final implementation of good results.