The topographic soil layer of Nanjing Yangtze River flood plain has the typical distribution characteristics of dual structure. The soil quality of the upper layer is poor, and the high compressibility of soft plastic, low strength and large deformation meets the definition of soft soil. Moreover, the soil layer is of a large thickness and wide distribution, which possesess a great influence on engineering construction. Aiming at the deformation force problem caused by deep foundation pit excavation in overshoal area, the PLAXIS, 3D as the background of a foundation pit project under construction in Liuhe district, Nanjing, is used to establish a finite element model, and a small strain hardening constitutive model ( HSS model) is adopted for soil mass. The model parameters are calculated according to the field investigation report, theoretical experience, and the actual situation of Nanjing overshoal area. The simulation results of surface settlement deformation, soil depth and horizontal displacement of support structure around the foundation pit are compared with the actual monitoring data. The results show that the trend of the simulation results is similar to the actual monitoring data, and the values are in good agreement. The simulation results can well reflect the actual surface settlement deformation around the foundation pit and the overall horizontal displacement trend and deformation size of the top of the foundation pit, and verify the feasibility of applying the HSS model in the foundation pit engineering in the flood beach area of Nanjing and the rationality of using the empirical method. The HSS model and parameters used in this paper can provide reference for the research of foundation pit engineering in flood beach area.
关键词
漫滩区/深大基坑/HSS本构/现场监测/数字模拟
Key words
floodplain area/deep foundation pit/HSS architecture/field monitoring/simulation analysis
维普
万方数据