基坑开挖对T型地下连续墙水平位移的影响

摘要

T型地下连续墙是一种新型自立式基坑支护结构,结合新沟河延伸拓竣工程,通过数值模拟和现场监测,分析了基坑开挖对T型地下连续墙侧向变形的影响,将数值分析结果与规范方法计算结果、现场开挖实测数据进行对比分析,研究了T型地下连续墙在基坑开挖至稳定期间墙体水平位移变化规律,验证了T型地下连续墙用于该工程中的合理性.结果表明,相比传统悬臂式地连墙,具有增加墙头抗弯刚度,减小墙顶位移的优点,有利于保证基坑工程的安全与稳定.%T-type diaphragm wall is a new type of self-supporting enclosure structure for construction of foundation pit.Through numerical simulation and field monitoring,combined with the Xingou River extension project,effect of excavation on lateral deformation of T-type diaphragm wall is analyzed.By comparing the numerical results with the standard method and the measured data,the variation of the horizontal displacement of T-type diaphragm wall during the excavation to the stability period is studied.The rationality of T-type diaphragm wall used in this project is verified.The results show,compared with the traditional diaphragm wall,this structure can increase the flexural rigidity,reduce the top displacement of the wall and is beneficial to ensure the safety and stability of foundation pit engineering.