Finite Element Research Of The Pile-soil System Next To The Abutment Under Raffic Loads

Traffic load is produced by vehicle movement, its characteristic is far different from static load and the seismic load, it is a long time reciprocating imposed the soil cycle load, In highway bridge was put into operation after the traffic load of reciprocating effect, make luqiao transition section of the abutment and backfilling area is different subsidence of continuous development, the movement of the soil often leads to adjacent pile happen larger displacement and settlement, causing the pile bearing capacity of decline, influence vehicle driving and vehicle operation safety of. In view of this, this paper mainly by means of finite element method, the traffic load soil properties and the abutment on nearby in the influence of pile are analyzed, the main content included:1. The traffic load of simulated when the usual half wave sine load and rectangle wave loads, Fourier form, with the type of load and load model multi-freedom five kinds of mathematical model forms do to introduce, according to the characteristics of traffic load, determined in this article with traffic load sine function form loading. Further study the traffic load long-term effects of pile side friction and pile foundation bearing capacity of influence.2. Based on a pile soil for the nonlinear elastic material premise, established structure-soil effect mathematic model of the system, and introduces the basic assumptions model, boundary conditions, the pile and pile soil conditions are given, and the connection structure-soil effect system equations of motion, and finally gives the pile foundation of basic abutment place differential equation.3. The research is mainly in the traffic load stress in soil near the abutment characters, from luqiao transition section of differential settlement, starting to change the bridge by board length, thickness and traffic load applied forms, get different parameters of soil deformation and stress strain, and the change rule to summarize.4. From vertical load transfer mechanism and placing pile foundation negative friction of the load transfer situation begin, using the finite element analysis method get when traffic load in a pile soil, single pile soil system of piles and soil action rule.5. GaoLin sets in the medium-sized as the background, engineering geology condition of traffic load to embankment filled soil, pile groups with characteristics of the soil forces on the system research and further studied under different pile spacing pile settlement and stress conditions.