The Prediction And Analysis Of The Axial Ultimate Bearing Capacity Of A Single Pile In The Lake Mud

With the rapid development of economical, the bridge construction has made great progress, the form of whose foundation continues to develop. The construction cost of pile foundation is high, about a quarter of total project cost. So it is necessary to ensure security, stability of the bridge, and also give full play to the technical and economic benefits of the pile. So it is very important to determine the limit bearing capacity in the design of the pile. However, the research of the bearing capacity of the pole in the condition of silt weak foundation is poor. The limit bearing capacity of the pole can not be obtained directly through capacity test which can be based on, use numerical analysis method modeling of limited data to predict the limit bearing capacity. Based on the XiHuXiu Bridge, predict and analysis limit bearing capacity of the pole in the condition of silt weak foundation.First of all, summarize and analyze the current situation of the limit bearing capacity of the pile at home and abroad. Explore the factors which affect the limit bearing capacity. And analyze axial load transfer mechanism and characteristics. By the plate loading test, research the mechanical properties and axial load transfer of the pile. From the text, get the Q～S curved which provide initial data for the prediction and analysis.Secondly, based on the technical information of the XiHuXiu Bridge, set up a three-dimensional pile-soil interface model by Ansys to simulate the process of pile static load test and predict the limit bearing capacity. The results of the finite element model are consistent with the experimental law of the measured data. So it can provide a reference for similar projects.Finally, predict the limit bearing capacity of the pile by ways of hyperbolic prediction method, grey system theory and least square method. The results of the hyperbolic prediction method are too large which are proved that this way can not be used to predict the limit bearing capacity of the pile.the least square method can be used to predict the limit bearing capacity of the pile while less precision. The results of the all data GM(1,1) model whose relative error are larger, the most being 33.43%.So it can not be used to predict the limit bearing capacity of the pile. But the results of the auto non step GM(1,1) model and with residual modification non step GM(1,1) model whose relative error are smaller and precision is higher can be used to predict the limit bearing capacity of the pile.