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Analysis and Calculation of Rigid Pile Composite Foundation Settlement

Author: LiBaoJian
Tutor: BaiXiaoHong
School: Taiyuan University of Technology
Course: Geotechnical Engineering
Keywords: Rigid pile composite foundation Settlement Calculation Analytical methods Three - dimensional finite element program Numerical Simulation
CLC: TU473.1
Type: Master's thesis
Year: 2011
Downloads: 149
Quote: 1
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Abstract


Rigid pile composite foundation is usually stiffness of concrete piles or high-grade cement and fly ash gravel pile (referred to as of CFG pile) as the vertical reinforcement material, and between its top of the pile with the underside of the foundation laying of a certain thickness cushion the load distribution between the adjustment piles, soil to ensure the pile-soil interaction. Rigid pile composite foundation pile high strength, stiffness, and be able to give full play to the carrying capacity of soil between piles, at the same time improve the bearing capacity can effectively reduce the settlement of the foundation, and thus get more and more in the works a wide range of applications, and achieved good economic and social benefits. Rigid pile composite foundation shallow foundation, pile foundation, the theory is still not mature, far behind the engineering practice, especially settlement prediction. Therefore, the study of rigid pile composite foundation settlement calculation has become a hot research field of foundation engineering, has important academic value and practical significance. Instance of rigid pile composite foundation engineering analysis based on the use of analytical methods and numerical methods, rigid pile composite foundation settlement, and settlement calculation method are discussed and perfect. This paper first introduces rigid pile composite foundation work mechanism and several theoretical calculation method of the settlement, and then by three commonly used engineering simplified method for calculating the 25 instances of rigid pile composite foundation settlement, that specification CFG pile composite modulus Method pile amount of compression method, the comparison analysis. Settlement with the measured difference in sedimentation value derived from the calculation method of the above theory specification recommends that the rigidity of the pile complex foundation settlement calculation method were discussed, pointed out that the method of calculation of rigid pile composite foundation settlement problems in the settlement Improvement of calculation method put forward some proposals. Finally, the use of three-dimensional finite element program MIDAS-GTS Numerical Simulation Analysis of rigid pile composite foundation settlement. Calculation and analysis of rigid pile composite foundation in vertical work loads, pile spacing, pile tip underlying layer of soil modulus, pile stiffness change on rigid pile composite foundation settlement. The analysis showed that the rigid pile composite foundation settlement to reduce the underlying layer of soil modulus improved with the pile tip, pile stiffness improved; rigid pile composite foundation settlement decreases as the pile spacing decreases, but when the pile spacing decreases to a certain value (3 times the pile diameter) from the bottom, the settlement tends to be constant.

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