| The pile foundation is one of foundation types with wide applications and long history. With construction of large-scale water cconservancy and conveyance system, such as south-to-north water diversion project, some large, extra large aqueducts and bridges have appeared in hydraulic engineering, then the lower foundation is conplication and increasingly widespread application of pile foundation in hydraulic engineering, therefore, it's very important to research the operating characteristics of complex pile foundation. The bearing capacity of pile foundation could be determine by model experiment, but the model experment cost more money and longer time, so it's diffculty to operate large-scale experiment. With the development of computer application technology, finite element method (FEM) has been widely used in engineering practice. A variety of complex factors such as the continuity, heterogeneity, nonlinear, anisotropic, viscoelastic of soil and characteristics of pile-soil interface could be considered used by finite element method, Griffiths(1982, 1998), Dasgupta (1995), Manoharan, Burd (1997), Frydman, Day, Potts(2000) and Zhengying analysized bearing capacity by this method, and received good results. The pile foundation of diverting water from yellow river in beizhao are dense pile groups constitute by four single piles with diameter of 1 meter,30 meters long,2.5 meters away from the pile center, and each of them connected by abutment. In this structure, the correlations between the piles and piles, pile and surrounding soil and among surrounding soils are complex, meanwhile, because of the nonlinear relations between stress and strain, so pile foundation couldn't be research as the simple sum of single pile traits. At present, the effect mechanism of vertical load among pile group structure still immature, especially the bearing capacity of pile group structure with larger vertical and horizontal loads in arched aqueduct abutment, there isn't domestic related reports in the literature at present.According to design requirements of yuncheng city water design institute about diverting water from yellow river, the three-dimensional nonlinear finite element model of arched aqueduct abutment pile foundation of diverting water from yellow river is established by ANSYS in this paper, and the method that jointly analysize the arch span-abutment-masonry body-pile-the foundation soil is raised. In this paper, considering temperature load,the stress and displacement distribution of each part of Structure is analysized by nonlinear finite element theory, stress and displacement of soil, arch span, pile foundation under horizontal loads and vertical loads are focused on. the method that jointly analysize the arch span-abutment-masonry body-pile-the foundation soil is elastic-plastic finite element analysis include: 1,The feasibility that jointly analysize the arch span-abutment-masonry body-pile-the foundation soil is analysized, the results has reference value to solve the problem of engineering practice, and promote the development of related research theory.2,In spacing smaller piles systems, the clearly interaction and the influence are between piles and pile and soil in piles.Deformation coordination overall between pile and soil in piles shows calculation method of single pile traits stack simply has larger distinguish with engineering practice situation. Analysis method of the overall modeling in the joint action is more accord with actual engineering.3,Temperature changes for light arch structure pile bearing capacity of abutment has less effect, but it has great influence on the deformation of arch structure and internal force. So, arch structure design must considered the temperature load. Phase compared, Under the conditions of temperature drop, settlement deformation in arch structure is the largest and most unfavorable for safety and stability of structure. |
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