The Deformation Characteristics Research Of H-type Double-row Piles In Foundation Engineering

With the rapid development of the national economy,in the process of city construction impact of the project small geographical space, the complex surrounding environment and other factors getting worse. Therefore, during the same time the use of underground space, the way to support the foundation have higher requirements.This thesis is based on South China City Square Projects of Hengyang city.Based on previous research and combined with engineering example, this paper studies the working mechanism, working properties, design and calculation method of the composite supporting structure. On this basis,for instance supporting structure for a field monitoring and numerical simulation related structures. The main research content of this paper is as follows:Based on engineering hydrogeological and geological conditions of South China City Square foundation pit, as well as the design and construction scheme of the excavation, the thesis developed a detailed monitoring program, including the ground displacement around the pit, pile top displacement, pile body displacement, underground water level, cable tension. Monitoring is carried out integrated continuous integrally and continuously, The monitoring data analysisof the deformation of foundation pit.The conclusions as following:(1) From the plane of the foundation pit, the supporting structure deformation in the middle section of the largest, shade angle to a minimum;(2) In the same section position foundation pit supporting structure, The top and back row pile displacement is bigger than the front pile, In the front stage of soil excavation pile displacement change rate is relatively flat;(3) In the whole process of foundation pit construction the monitoring project data are within the scope of control, emergency alarm didn't happen.Lastly, the finite element software numerical simulation analysis for the project Simulation of foundation pit excavation under actual working condition and deformation of retaining structure in the process of regular, And compared with the measured data analysis,. The conclusions as following:(1) As well as traditional retaining structure with double-row piles, the project of the h structure with double-row piles have larger stiffness and have more stability in controlling deformation, This arrangement types on the internal forces of the supporting structure itself distribution of transfer are the embodiment of the good;(2)Simulation and the measured there is a certain deviation. simulation of the back slope, in front of the pile top displacement and pile top displacement is bigger than the measured values;(3) The h-type double pile-anchor supporting structure which are two rows of piles at different elevation ensures the safety of the construction of foundation pit, and a lower cost than traditional double row pile.