The Research of Embedded Depth of Pile Retaining Structure in KunMing
|School||Kunming University of Science and Technology|
|Keywords||Foundation supporting piles embedded depth overload groundwater FEM|
When you design a support structure, calculation of embedded depth is both technical issues and economic issues. On one hand, it relates to the costs of the whole project, on the other hand, it also affects the safety and stability of the entire project.For row pile retaining structure, structural balance is dependent on both the fulcrum and the embedded depth. Pile must have enough embedded depth used to form a force to ensure stability. Therefore, a study on embedded depth, that is, seeking balance, both in economic and security issues. Basing on the existing theory of Foundation pit support, relying on a foundation pit support engineering of Kunming, this article calculated of embedded depth of support structure, reaction of support and internal force of pile. Through the application of finite element software, this article simulated foundation pit excavation to study the influence of groundwater and ground overload on embedded depth; to analyze of embedded depth and maximum displacement, maximum bending moment and shear. The main work and the results achieved are as follows:(1) Investigate at the project site to gather engineering data. Learn about features and modes of Foundation pit deformation and analyze of its causes, to sum up and to build Foundation projects and model test.(2) Introduce Foundation pit support design theory, and focused on the calculation method of row pile supporting system;(3) Introduced a large geotechnical finite element analysis software PLAXIS, on the background of one deep Foundation pit engineering in Kunming, to analyze of the characteristics of deep Foundation pit project.The use of bored piles as supporting structure of finite element numerical simulation of excavation and construction, build model, compute the sway of different stages of excavation retaining piles for excavation.(4) Build continuum finite element model of the excavation, and analyze of groundwater and ground effects of overload on piles embedded depth. In the context of embedded depth remains the same, as the overload value increase, maximum horizontal displacement of pile grows and increases more and more obvious; the maximum bending moment of pile into linear growth; pile maximum shear-wave trend. In the context of embedded depth remains the same, with the lowering of the water table outside, maximum horizontal displacement and maximum pile bending moment showed a decreasing trend, maximum shear and maximum axis force increased slightly. Maintain pit water level does not change, as the embedded depth value increases, the groundwater flow path is increased, penetration Reduced, Maximum horizontal displacement, the maximum bending moment and the maximum shear force is reduced.