Study On Calculation Of Negative Skin Friction Between Pile And Soil

Since the reform and opening up,the state through a set of traction macro-control policy coherence,in city construction,traffic development and a series of infrastructure investment as the vanguard,continue to broaden and medium-sized city group,the new depth of the new height and building the foundation of the city landmark constantly refresh.Facing the higher requirements by lager structures,and higher stability on the basis,pile foundation,as a kind of ancient,basic and mature selection for basis on technology and experience.Taking the complex ground conditions of significant architectural personality loads into account,as the same time,pile foundation is the preferred selection of foundation programs which is suitable for complex ground conditions and huge building foundations with the greater integrity and greater stiffness in conditions of larger vertical loads and horizontal loads.With the rapid development of super high-rise buildings,the application of pile foundation is becoming more and more widely and the length of single pile is longer and longer too.The influence of negative friction which is negligible between pile and soil in pile foundation applied early has already been highlighted,that engineering accidents caused by pile foundation in the construction process to give full consideration to the problem of negative friction of pile foundation is more and more common.However,the theoretical research on negative skin friction of pile foundation is still lagging behind.lt is a great threat to the safety of engineering structure and the safety of life and property.The calculation and theoretical exploration of negative skin friction of pile foundation have become a hot topic in geotechnical engineering.Under the complex loads environment,the soil layer condition and the external influence environment,the pile-soil interaction mechanism is more complicated.Due to the complexity of the mechanism of pile-soil interaction,the interaction between pile and soil is not very deep.The present situation of the research of negative friction from the the current situation of domestic and foreign related,introduces several main conditions between pile and soil which causes the negative friction resistance and several main calculation method to calculate negative friction resistance of pile foundation and the lack of research on negative friction force of pile negative friction and the formation mechanism and calculation of negative skin friction of pile foundation,and has chose the better one calculation method which is relatively reasonable and practical by combining the engineering examples with the related mathematical model that established.Finally through the calculation of the actual results were compared and analyzed,obtained the change of pile negative friction in the same pile section and the same conditions of soil mechanical properties with different loads on the pile top;and the influence of different section shape for pile friction resistance when the pile section areas are equal.Through the comparative analysis of the above two,to provide a basis for the study of the influence factors of negative skin friction between pile and soil.