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Study on Working Behaviour of CFG Pile Composite Foundation

Author: WangRuiFang
Tutor: LeiXueWen
School: Wuhan University of Science and Technology
Course: Municipal Engineering
Keywords: CFG pile Composite Foundation ANSYS finite element Pile-soil stress ratio Bearing capacity Settlement Complex modulus Sedimentation control theory
CLC: TU473.1
Type: Master's thesis
Year: 2003
Downloads: 401
Quote: 19
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Abstract


The purpose of the foundation treatment is to improve the strength of the weak foundation , to reduce the compression of the soft ground , reducing settlement and differential subsidence . In the foundation treatment , composite foundation applications is very wide. At present , the theoretical study of the composite foundation far behind in practice , its working mechanism and deformation calculation has not yet been fully understood . In this paper, the following questions : 1. Composite foundation bearing the actual role of the pile - soil - cushion - cap compatible deformation process of working together . Especially due to the composite foundation pile group composite foundation are many factors affecting the study of the mechanism needs further . In this paper, ANSYS finite element program , analysis of CFG pile composite foundation pile vertical load , stress ratio of pile groups under vertical loads , settlement, The pile axial stress distribution, soil load sharing than with the s / d L / d , the E P / E s < / sub > and other factors, changes in the distribution of , and a large area of pile group and single pile finite element calculation results contrast. 2 . And the pile composite foundation settlement generally too large , if the settlement is beyond the reasonable control , easy to make the superstructure cracks or tilt . Sedimentation control design theory is more stringent than the carrying capacity control design theory more reasonable . Composite foundation settlement calculation method , the composite modulus method is used most widely . Traditional composite modulus formula E cs = mE p (1-m) E s is set up only under certain conditions , the general pile of bond strength and high bond strength piles composite foundation ( CFG pile ) does not apply , This paper presents a more reasonable , more practical value to the formula to calculate the composite modulus , and with engineering examples to prove it reasonable.

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