某复合土钉墙支护基坑的变形监测与数值模拟研究

Deformation Monitoring and Numerical Simulation of a Foundation Pit Supported by Composite Soil Nailing Wall

目前,越来越多的深基坑采用复合土钉墙支护,以某采用复合土钉墙支护的深基坑为研究对象,在基坑开挖施工过程中,对基坑侧壁深层水平位移,顶部水平位移,顶部竖向位移进行监测。通过对现场的监测数据分析与研究,可以得出在安全可控的范围之内,该基坑的整体变形值随着开挖深度的增加而增大,基坑侧壁的深层水平位移沿深度方向呈鼓腹状,基坑支护方案满足设计要求。同时运用有限元软件MIDAS/GTS对基坑支护工程进行数值模拟,其模拟结果也在安全可控的范围内。通过对监测数据和模拟数据的分析,可以为该类型支护形式下的基坑设计和施工提供一定的参考价值。

At present,more and more deep foundation pits are supported by composite soil nailing wall.Taking a deep foundation pit supported by composite soil nailing wall as the research object,the deep horizontal displacement,top horizontal displacement and top vertical displacement of the side wall of the foundation pit are monitored in the process of foundation pit excavation and construction.Through the analysis and research on the field monitoring data,it can be concluded that within the safe and controllable range,the overall deformation value of the foundation pit increases with the increase of excavation depth,the deep horizontal displacement of the side wall of the foundation pit is bulging along the depth direction,and the foundation pit support scheme meets the design requirements.At the same time,the finite element software MIDAS/GTS is used to simulate the foundation pit support engineering,and the simulation results are also in a safe and controllable range.The analysis of monitoring data and simulation data can provide a certain reference value for the design and construction of foundation pit under this type of support.