Study On The Limit Bearing Properties Of CFG Pile

CFG pile composite foundation is a kind of high efficiency and excellent foundation treatment method,which has been widel y used in high-rise and super high-rise buildings in Xi'an loess area.However,there is less research on the ultimate bearing capacity of CFG pile composite foundation under high stress level.Therefore,the ultimate bearing capacity of CFG pile composite foundation was deduced in this paper,Combined with engineering exa mple and numerical simulation,It is hoped that the project can be used in a scientific and reasonable way.(1)The reinforcement mechanism of CFG pile composite foundation,the interaction mechanism of pile and soil,the stress ratio of pile and soil,and the calculation formula of bearing capacit y were anal yzed.These laid on a solid foundation for the subsequent theoretical derivation.(2)The derivation of the position of the neutral point b y using the quadratic curve equation,the more accurate and more pr actical formula for calculating the position of the neutral point is obtained by using the three order equation.Based on the basic theory of CFG pile composite foundation and the neutral point theory,which was deducted.According to the different characteri stics of the upper and lower parts of the neutral surface of CFG pile composite foundation,Using Terzaghi model and Meyerhof damage model.From the theoretical aspect,the ultimate bearing capacity of CFG pile composite foundation was deduced.(3)Based on a project in Xi'an loess area,the ultimate bearing capacit y of CFG pile composite foundation is measured by field test,which verifies the correctness of the theoretical derivation.According to the measured data,the ultimate bearing capacity of CFG pile c omposite foundation under the condition of high stress level in Xi'an loess area was anal yzed.Expect to be able to direct construction and design in actual engineering.(4)The FLAC3 D finite software was used to verify the correctness and applicability of t he theoretical derivation.(5)The research results of this paper are sorted out,Based on the actual situation,the future development of CFG pile composite foundation is discussed,And the current technical problems.