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Research on Super High-rise Building Pile-raft Foundation’s Theory and Application in Engineering

Author: ShenZhaoWu
Tutor: ZhuHeHua;WangWeiDong
School: Tongji University
Course: Structural Engineering
Keywords: Piled raft foundation Mindlin solution Poulos solution Geddes solution Reissner slab Together Voronoi diagram Delaunay triangulation World Financial Center Engineering test
CLC: TU473.1
Type: PhD thesis
Year: 2008
Downloads: 574
Quote: 2
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Abstract


To the high-rise building and super high-rise building, especially sited in soft-soil ground, pile-raft can be formed by the pile foundation and the upper raft. Pile-raft foundation has right function that is big carrying capacity, reduce the average settlement and adjust the difference settlement and so on. In this paper, pile-raft foundation analysis method will be researched through the method of the interaction of superstructure, raft, pile and soil, and it will be validated by the super high-risebuilding------Shanghai Round-the-world Finance Center’s engineering measurementdata. At the same time, the Voronoi method in computer graphics will be applied to analysis the horizontal nonhomogeneous soil. The main research content is as follow:1) Calculating the single pile, double pile, pile to soil and soil to soil’s influence coefficient through the correction Poulos elastic theory solution, then the pile-soil stiffness will acquire. To the influencing factor of the pile-soil stiffness, it should be analyzed that is pile length, pile diameter, soil modulus of compression, Poisson ratio and so on. The program can be validated through the long-and-short pile and latter pouring belt analyzing in actual project.2) Based on the Geddes elastic stress solution, it can describe to the analytic solution, that is the pile end resisting force, linearity distribute and triangle distribute force coming form the pile side resisting force. Base on the solution, the pile-pile coefficient can calculate, so the group piles may analyze. The rationality of theory can be testified through the mode structure. At the same time, it should be analyzed the influence to the pile rigid, that is the factors, such as the pile long, pile diameter, soil modulus of compression and so on.3) Based on the Reissner thick plank theory, the raft plank has been analyzed by the 8-node isoparametric element. It will be verified by the analysis result ofthe universal finite element software------ANSYS Shell element. The plankcomputing influencing factor will be discussed. Through summarized the characteristic of interaction method, it will be found and applied in actual project that is the simplified analysis method for the superstructure. The program’s validation will be tested throng calculating the Beijing Television Culture Center (TVCC) engineering design. 4) Summarizing the definition, feature and algorithm of the Voronoi graph and its dual graph Delaunay triangle, the indirection algorithm to Voronoi graph will be researched. Based on this algorithm, it will be analyzed that is the difference result of considering the horizontal nonhomogeneous or not for the ideal model. At the same time, converter pile-raft foundation design will be analyzed. So the validation of considering horizontal nonhomogeneous will be summarized.5) Based on the interaction analyzing method, settlement, pile counterforce, moment and so on have been calculated for the Shanghai Round-the-world Finance Center’s engineering. It should be arranged this engineering’s measurement data. Contour chart will be plotted throng the precision gradienter measure the raft plank height mark and settlement from the difference. Taking the pressure cell on the pile and surface strain cell to measure pile counterforce, the variation law will be summarized. Taking reinforce bar stress gauge and concrete stress gauge to survey the change of raft reinforce bar and concrete stress, and taking thermometer to scale the raft concrete temperature to gain the influence of the heat of hydration. At the same time, adopting pore pressure gauge to scale the pore water pressure and taking soil pressure cell to measure the soil pressure, then the share scale of pile and soil among the pile will be analyzed. Summarizing the law of this kind of pile-raft foundation, the program is validation should be tested, so it will give some good experience to this kind of high-rise building’s pile-raft foundation analyses and design.

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