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Study on Piled Raft Foundation of High-rise Building and Variable Rigidity Design Method for Balance Settlement

Author: HeZiShuai
Tutor: ZhongZuoHui
School: Shandong Institute of Architecture
Course: Geotechnical Engineering
Keywords: Piled raft foundation Differential settlement Model test Variable stiffness Leveling design
CLC: TU473.1
Type: Master's thesis
Year: 2010
Downloads: 110
Quote: 2
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Abstract

Piled raft foundation with good integrity control differential settlement and the ability to resist uneven settlement is very significant, and has become the most commonly used in buildings in the high-rise buildings or on soft ground foundation type. Piled raft foundation has broad application prospects, since the 1980s, people piled raft foundation depth, made a lot of research. Piled raft foundation and soil together is very complex, bearing mechanism and load transfer mechanism is not yet fully understood, the actual engineering tend to adopt a conservative approach to guarantee the safety factor, resulting in the unnecessary waste of material, and a substantial increase in the project cost . How to optimize the design of piled raft foundation, selection of the optimal design of piled raft foundation, gradually become the hot spot of the current study. Piled raft foundation design lies in the calculation of settlement on the basis of analyzing the previous work, this paper summarizes the pile, the various methods of settlement calculation of pile groups, comparing the advantages and disadvantages of the various methods proposed using the finite element analysis piled raft foundation principles, ideas and methods. Relying on a high-rise building piled raft foundation model test, comparative analysis of four different programs piled raft foundation settlement, differential settlement, soil reaction and pile top reaction force data to explore the mechanism of piled raft foundation work and seek more common the law, to provide a reference for future design. Large finite element software ANSYS numerical simulation of the model test, uniform cloth to pile on the natural foundation raft foundation, variable pile away from the pile of cloth, variable the pile length change pile spacing the fabric pile four commonly used engineering programs were established computing model, the calculation results with the experimental measured data compare basic agreement, thus proving the feasibility of numerical simulation. According to the theory, experiment and numerical analysis results can be seen, larger space to optimize the design of piled raft foundation. Both improve piled raft foundation work efficiency optimization design method to adjust the the cloth pile and raft thickness. Adjust the cloth pile way to change the length of the pile, to change the pile spacing, changing the pile diameter, select the \ANSYS simulation of six raft thickness results analysis found changes in the thickness of the raft piled raft foundation settlement and internal forces affect the relationship, made a raft relative bending - thickness curve, which found reasonable raft thickness is selected method. In summary, the working properties of high-rise buildings piled raft foundation are discussed in accordance with the model test and numerical analysis to draw some useful conclusions, given the variable rigidity design principles and guiding ideology summed piled raft foundation optimize the design of the two main methods to provide reference for practical engineering value.

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