Numerical Calculation and Model Parameter Analysis of Paritition Excavation of a Ultra-deep Foundation Excavation in Shanghai
Taking an ultra-deep foundation excavaton with a depth of more than 40m in Shanghai as an analysis case,a refined fluid-solid coupling numerical analysis method for ultra-deep foundation excavation is established.Through the measured data and parameter back analysis,the deformation distribution law and deformation mode of the enclosure structure of the multi-factor superposition coupling effect of the ultra-deep foundation excavation were studied.The results show that the deformation effect of deep soil excavation is more obvious than that of shallow soil excavation,and the deformation amount and deformation rate of layered excavation increase gradually.It is necessary to consider the stiffness reduction of enclosure structures when simulating the deformation effect of foundation excavation.The dewatering of the confined aquifer at the bottom of the foundation excavation is beneficial to controlling the deformation of the foundation excavation,and the deformation rate of deep soil excavation decreases significantly after dewatering.The spatial effect of the deformation of the enclosure structure is significant,and the geometric form of the corner of the underground continuous wall has a great influence on the lateral displacement of the enclosure.The calculated results can better fit the measured results,and the maximum error of prediction can be controlled within 20%.
deep foundation excavationsupportsdeformationspatial effectback analysisstiffness reductioncorner effect
万方数据
维普
