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Study on Deformation of Tamped Cement-soil Pile Composite Foundation under Embankment

Author: WangShengTao
Tutor: YangGuangQing；WangShuBin
School: Shijiazhuang Railway Institute
Course: Bridge and Tunnel Engineering
Keywords: Composite Foundation Tamped concrete piles Factors Deformation characteristics Settlement
CLC: U416.1
Type: Master's thesis
Year: 2008
Downloads: 54
Quote: 0
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Abstract


With the pile composite foundation in Soft Foundation Treatment more and more, found that as the representative of roadbed under flexible foundation piles composite foundation with the previous order of the audience pile composite foundation's work has a very different character , regardless of the strength of composite foundation or settlement, theoretical calculations have shown and measured values ??can not be ignored differences. For the first time used in Hebei Expressway Soft Foundation Treatment of tamped concrete piles composite foundation, theoretical analysis, finite element simulation and field test a combination of means, tamped concrete piles composite foundation deformation behavior has been systematically studied, is compacted cement pile composite foundation design and calculations provide more scientific technical basis. First, based on flexible piles model assumptions, analyzes tamped concrete piles composite foundation load transfer mechanism and the deformation mode. According to the flexible foundation piles composite foundation under the equivalent unit body stress analysis, based on the vertical pile composite foundation deformation compatibility conditions and static equilibrium conditions discussed between the pile and the pile of soil and pile stress distribution soil stress ratio variation. Secondly, the use of finite element simulation technology, using nonlinear finite element software, a more comprehensive analysis of the cushion modulus, modulus of pile foundation soil modulus, pile spacing (replacement rate), modulus embankment, embankment fill soil height and aspect ratio and other factors on cement soil pile composite foundation deformation characteristics of proposed control composite foundation deformation should be considered a major factor. By Paul Tsang Expressway Soft cement soil pile test section for the engineering basis, through field test monitoring, analysis of the embankment loads cement soil pile composite foundation force and deformation characteristics, features and ground deformation studies settlement laws. For compacted cement pile composite foundation characteristics of composite foundation finite element model, its force and deformation characteristics and laws of calculation and analysis. The field test results with the results of comparative analysis of finite element calculation, compacted cement pile composite foundation stress and deformation of the measured results were affected by the construction of factors than discrete, but the change is similar to the trend in order to verify the reliability of the finite element, for the study of embankment loads tamped concrete piles composite foundation traits provide technical reference.

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