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城市繁华地段开挖深基坑,在保证安全和保护环境情况下,复杂环境使得基坑的设计和施工都非常困难,特别是对承压水的控制。结合某基坑设计选型实例,分析了TRD工法的适应性与常规止水帷幕的不足,并结合钻孔灌注桩在基坑围护中的适应性,运用理正和PLAXIS分析软件进行基坑变形计算。分析表明:与常规止水帷幕相比,TRD工法构建的等厚度水泥土搅拌墙在深基坑止水方面有优越性;大直径钻孔灌注桩做为基坑的围护结构,其位移变形主要发生在开挖阶段;揭示了“分层、分区、分块”对基坑开挖的重要性,及时浇筑底板的合理性,可为基坑开挖施工方法提供依据;考虑所选围护结构对场地适应性,可为杭州同类基坑工程设计方案选型提供参考。
Deep excavation of bustling urban areas, in ensuring the safety and protection of the environment, the complex environment makes the design and construction of the pit are very difficult, especially for the control of confined water. Combined with the design example of a foundation pit, the adaptability of the TRD method and the deficiency of the conventional curtain are analyzed. Based on the adaptability of the bored piles in the foundation pit protection, the deformation of the foundation pit Calculate. The analysis shows that compared with the conventional water curtain, the equal-thickness cement-soil mixing wall constructed by TRD method is superior to the water-proofing of deep foundation pit. The large diameter bored pile is used as the retaining structure of foundation pit, and the displacement deformation Which mainly occurred in the excavation stage. The importance of “stratification, zoning, and sub-block ” excavation of foundation pit and the rationality of pouring the floor in time were revealed, which could provide basis for excavation construction method of foundation pit. The adaptability of the enclosure structure to the site can provide references for the selection of similar foundation pit projects in Hangzhou.