天津市某医院深基坑工程变形特性及预测研究

依托天津地区软土大背景下的深基坑工程,对天津市某医院大尺度深基坑开挖施工过程中的现场观测数据进行理论分析,并利用FLAC~(3D)软件建立3D基坑模型并对基坑开挖支护全过程进行动态模拟,将软件计算结果与基坑现场监测数据进行对比。对比结果表明:模拟所得数值与现场观测数据规律较为贴切,随着基坑开挖进一步进行,外侧土体位移量逐步增加,当基坑开挖全部完成时,土体出现最大沉降量,桩顶水平位移与深层水平位移均满足监控测量标准的要求,说明所选取的支护结构等措施可以较好地控制基坑围护结构的变形并提出预测最大侧向位移的公式为后续类似工程提供一定的参考依据。

Research on Deformation of Deep Foundation Pit Engineering

Based on the deep foundation pit project under the background of soft soil in tianjin, the field monitoring data during the excavation and construction of large-scale deep foundation pit project in a hospital in tianjin were analyzed and studied, and the whole process of foundation pit excavation and support was numerically simulated by using FLAC 3D software, and the measured data and simulated results were compared and analyzed.Results show that the numerical simulation results and the actual monitoring data of law is relatively consistent, with the increase of excavation steps, foundation pit bracing of the lateral soil displacement is gradually increased, the maximum settlement occurred in the foundation pit excavation is complete, the horizontal displacement of pile head and deep horizontal displacement meet the requirement of monitoring measurement standard, and explains the engineering measures such as the selection of supporting structure can be well control deformation of foundation pit retaining structure to provide certain reference basis for subsequent similar projects.