The Research Of Earth Pressure Behind The Abutment Of Integral Abutment Bridge

After the1970s, domestic and international experts on the analysis of the research, summing up the experience and lessons are put forward design concept of the life cycle cost minimum. The life cycle cost not only include initial the cost of building, including the later operation and maintenance costs too. In the design concept, asking for setting up the thought of system theory, from the project life cycle to look at the whole process of the cost, improving the durability of structures is the important embodiment of the design concept. Due to the elimination of the Integral abutment bridge and extendable devices, realize the continuous bridge deck, effectively reduce the bridge bearings and is adjustable seam the happening of the disease, improve the structure of the durability, and to reduce the maintenance cost later, fully reflected the life cycle cost minimum design idea, so foreign scholars have done a large number of research on integral abutment bridge.Although the experts at home and abroad have done many theory research,but because of the complexity of abutment-soil interaction,there are many problem having not been solved on the methods of analysis and design of the earth pressue,and our country’s experimental study of the earth pressure is still in a blank stage. So through the real bridge of integral bridge to do further research and analysis is very necessary, with pracital application value. Based on the integral abutment of Fuyu Industrial park, this paper conducted the following studies:(1) The distribution and variation laws of the earth pressure are analyzed in seasonal falling and rising temperature difference through the test data, and comparing with the error of the test result and the simplified calculation. At the same time, the mathematical model of the coefficient of passive earth pressure when temperature rising under different ratio of the superstructure deformation and the height of abutment is established.(2) Based on the contacting level nonlinear spring behind abutment and pile, this paper build the generalized beam-grid of finite element anslysis model by TDV. Then according to change the Load type, longitudinal bending stiffness of abutment, the length of pile and longitudinal bending stiffness of pile, analyze earth pressure of abutment.