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Negative friction pile foundation building characteristics

Author: ZhengPengYi
Tutor: YangQing
School: Dalian University of Technology
Course: Geotechnical Engineering
Keywords: Pile Negative friction Heaping Consolidation Finite element method
CLC: TU473.1
Type: Master's thesis
Year: 2008
Downloads: 232
Quote: 2
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Abstract


As science and technology continue to develop and update, pile foundation due to its good nature and subject Haute increasingly common as a building foundation. Over the past decade, Port, Coastal and Hydraulic gradually increased as well as modern construction technology continues to progress, pile foundations are increasingly being applied to a variety of important works. In practical engineering, the engineering design did not consider the impact of negative friction pile arise due to uneven settlement building tilted collapse phenomenon is still greater. Today, because the phenomenon of negative friction pile generalization, aggravation and specialized, it has been a lot of civil engineering design and academics of the pie. With the help of model tests and numerical simulation for a single pile and pile group negative skin friction characteristics are more in-depth and systematic research, and obtained some useful conclusions. The main contents are as follows: Through the end bearing and friction end bearing two types of single and group piles model, top of the pile of pile vertical load and a large area of ??the pile heap loads traits were charged with friction research, get loads and pile mound pile pile under the action set out in the settlement, axial force, pile lateral friction, tip resistance and a pile of soil consolidation settlement variation. This paper focuses on a different number of piles and piles of different spacing conditions, 4 and 9 group pile tip resistance, axial force and soil sedimentation time variation with consolidation, deepened the negative friction pile group foundation Characteristics understanding. The results showed that: in the pile and pile group foundation pile mound loads, the friction of the pile who are charged with a significant time effect; pile group foundation has obvious negative friction pile group effect; number of piles, pile spacing, and pile locations are charged with friction on the pile significant impact. Based on large-scale general-purpose finite element software ABAQUS, establish pile - soil symmetric three-dimensional finite element model; laboratory soil testing in accordance with the reasonable parameters for calculating, based on the part of the model test for further numerical simulation, and the order for the two kinds of load impact on negative friction were analyzed. The results show that: the numerical results and experimental results in negative friction variation on the basic agreement, indicating that the reasonable selection of soil constitutive models and calculation parameters under the conditions of the finite element method can be used effectively to negative friction characteristic pile analysis. Different loads sequence analysis showed that the top of the pile mound pile load and load level is the same, under the action of load at pile top of the pile charged with first friction pile mound contained significantly greater than the effect of the first situation.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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