| With the development of the technology,the buildings are getting taller and taller. So there are some long piles,super long piles.The influence of negative friction were little,but now,they are getting more and more important.In this situation,the problem is now a hot spot problem in Geotechnique Engineering field.At first in this report ,we retrospecting of all kinds of calculative methods.We analysed these methods,and mentioned their advantage and disadvantage .In this paper,I suggested that measure the negative friction using the typical points of piles's negative friction change. For many layers foundation,the negative friction is calculated,regarding each layers clay as even.However,the clay stress cbove it and the clay settlement under it are influence on the negative friction of thid layer.The relevant program is compiled because of compicated calculation.The method of typical point is:At first,by analysing the relative distance,the energy that various powers functioned on the relative distance of the piles and soil,which is called the energy measurement's analysis of pile's negative friction,it denote negative friction along piles's depth normal formation of three times's insert result's polynomial.Then,by using piles's negative friction along depth's change regulation and the typical points of pile's negative friction, determining the polynomial's coeffient,following this, we get the negative friction's analytical resolution according typical points's methos.This analytical resolution can reflect the change regulation of piles's negative friction along the piles.By the way,by applying a engineering example,the result proved that the analytical resolution we got is similar with the ripper ethod.Thus,this method offered a new valuable calculation method that determining piles's negative friction. |
