Deformation Simulation Analysis Of Rowed Piles And Internal Supporting Structure For Deep Foundation Pit

With the continuous development of China's economy and the acceleration of urbanized pace,urban high,super-high-buildings are increasing,and the area and depth of foundation pit have also been greatly changed.The foundation pit engineering refers to take a series of measures to ensure safe and effective construction of the main structure and no damage to the surrounding environment in the underground structure construction process,like foundation pit supporting,dewatering and earth excavation.Nowadays,the deep foundation pit project is increasing gradually.The characteristics of deep foundation pit engineering are mainly deep,large and complex.Once the foundation pit is excavated,the supporting structure begins to deform.Because the excavation is always in front of the support,the supporting structure begins to deform as the foundation pit is excavated.The deformation will cause a series of damage,such as land subsidence,structural fracture,and a very serious impact on the surrounding building.Based on a foundation pit supporting project in Shanghai Province,Rowed Piles and Internal Supporting Structure has been deeply studied.The main works are as follows:First of all,the main supporting system and its application scope are summarized,and the deformation theory is analyzed based on the deformation mechanism of the deep foundation pit;Secondly,relying on the Shanghai Jing'an District base project,and the existing data in the project as a reference,with the help of Midas GTS software,the paper establishes a model of rowed piles and internal supporting structure for deep foundation pit and simulates its excavation process to get the corresponding strain nephogram,and then retain its deformation and the axial force from nephogram;Next,basing on the monitoring data obtained from the actual site,the paper comparatively analyzes the monitoring data and simulating data,and determine the rationality of parameter selection and model establishment;Finally,according to the established model,the paper uses numerical simulation method to study the influence of parameters such as pile depth,pile spacing,pile diameter,ground overload and spacing of the support on the deformation of supporting pile.