TRD水泥土搅拌墙施工环境影响分析及微变形控制措施
Impact analysis and macro-deformation control measures of TRD construction cement-soil mixing walls
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摘要: TRD水泥土搅拌墙在深大基坑工程中的应用逐渐增多。TRD水泥土搅拌墙在施工过程中不可避免会对邻近土体产生扰动,在复杂的城市环境中水泥土搅拌墙施工扰动可能对周边环境产生一定的影响。在上海虹桥商务区一期08地块项目、上海新闸路西斯文理项目和上海国际金融中心项目基坑工程中,超深水泥土搅拌墙试成墙实施期间对邻近土体侧向位移、地表沉降进行了监测,根据监测结果对水泥土搅拌墙施工环境影响作了系统分析。分析结果表明,TRD水泥土搅拌墙施工过程中对周边环境的影响总体较小,邻近地表最大沉降和土体侧向位移均小于10 mm,主要影响范围在10 m之内,并基于敏感环境的保护要求提出了控制墙体施工微变形影响的技术措施。Abstract: TRD construction cement-soil mixing walls have been increasingly used in deep and large excavations. The TRD construction will disturb the soils around construction panels and hence influence the nearby facilities when it is used in urban areas. Field monitoring is carried out on lateral soil displacements and ground surface settlements during TRD construction in three projects, i.e., Hongqiao Business District-08 block (phase I), Shanghai Xisiwenli excavation on Xinzha Road, and Shanghai International Financial Center. Based on the field monitoring results, the impact of TRD construction on the nearby environment is systematically analyzed. It is shown that the overall influence of TRD construction on the nearby environment is small. Both the measured maximum ground surface settlement and lateral soil displacement are less than 10 mm in all the three cases. Moreover, the influence zone of TRD construction is within 10 m away from the panel. Some measures for minimizing the deformation during TRD construction are also proposed and discussed.