Study On The Bearing Capacity Of Single Pile Under Surcharge Loads

Pile foundation is one of the oldest foundation forms,and develop very rapidly in modernize era. Along with the piles technology's development and construct skill bring forth the fresh,pile has became the broadest foundation forms in project item. The negative friction in pile's designing and constructing is acquainted with for engineer. Many survey data refer to mortal down load and sedimentation be produced due to the negative friction in pile foundation. The inequable sedimentation endanger the pile foundation greatly. Due to the important infection in using foundation, the negative friction in pile has became one of the engineering skill focus.This paper describe different methods of determining single piles negative friction. The advantage and disadvantage of these methods are discussed. In engineering practice, negative friction must be considered to ensure the foundation stability. The factors that cause negative friction are discussed. The neutral point and negative friction are determined according technical code for building pile foundation.Load transferring concept, the author puts up with a method which uses hyperbolic model to analyze the load transfer mechanism of a single pile. The author utilizes hyperbolic model to back calculate parameters of pile load transfer curve from various sites of Shanghai are collected.Based on the concept of load transfer function, this paper advances a method which is used for analyzing single pile load transfer character by hyperbolic model. After many back-analysis and statistical research, the parameter picking rule of Shanghai area load transfer function is obtained.This paper studies bearing and deforming behavior of single pile and load transfer characteristic by indoor model experiment and in-situ test. analyses the single pile carrying capacity effect under negative friction by comparing two situation that with load or not. analyses various parameter value of negative friction pile load transfer function combined with the statistical rule of pile load transfer parameter.