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Buckling Research on Pile Foundation of Bridges in Thick Alluvium

Author: HuXiaoMin
Tutor: XiangMuSheng；LiZhiDa
School: Wuhan University of Technology
Course: Structural Engineering
Keywords: Pile -Turkish relations Load transfer mechanism Flexion Finite Element Optimal design
CLC: U443.15
Type: Master's thesis
Year: 2005
Downloads: 85
Quote: 0
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Abstract

Based on the test-ANSYS7.1 pile foundation analysis and calculation of the three-dimensional finite element contact model using the finite element software to calculate the critical buckling load pile foundation and the optimized design of the bearing capacity of pile foundation. Single pile subjected to axial loads, there are three failure modes, that is, the overall shear failure, piercing damage and buckling failure. For the thick alluvial overburden pile foundation, Pile Bearing force layer strength, and pile length (slender than large), the soil around the pile body for the weak soil, the paper around this feature critical buckling load calculation. First, the article describes the method of static load test of the test device, load and are how static load test test data to determine the vertical bearing capacity of pile foundation. The next pile-soil load transfer mechanism. There are two methods to determine the axial bearing capacity of pile foundation, to determine the bearing capacity of the soil or pile material strength identified. In fact, the bearing capacity of the pile is the pile soil interaction results. Due to the complexity of the role of the pile-soil, soil heterogeneity, discontinuity characteristics, pile soil interaction process becomes more difficult. The study shows that, with a nonlinear function to describe the process of load transfer is more accurate. In this paper, three mathematical models: ideal elastoplastic model, hyperbolic model and exponential model. This paper focuses on the process of the establishment of the exponential model, mechanical knowledge to establish the mathematical model of pile loads gradually attenuated with depth that loads traits pile end of pile and soil, the soil around the pile stiffness ratio, pile soil stiffness ratio, The pile the aspect ratio and other factors. By using three-dimensional finite element contact model to simulate the pile and soil contact force between pile and soil, and discuss the pile in the the soilless body under the critical buckling load. The calculation results show that the role of soil around the pile to the pile foundation of critical buckling load has been greatly improved. Static analysis, the distribution of the results of static load test pile side friction than the same time on the pile. According to the resistance of the soil around the pile, the expression of a function of the depth of the soil resistance and soil. Finite element buckling analysis showed that the test pile, the pile foundation buckling failure does not occur. Taking into account the depth of the pile embedded rock and calculate the critical buckling load larger features to optimize the design of its structure. First of critical depth of rock-socketed pile foundation, piled structures based on minimum pile diameter and depth of the best rock-socketed optimized design, test pile embedded rock depth calculation that optimize the depth of the rock-socketed 2.24 m, less than the actual depth (11 m).

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