| The pile foundation is one of the ideal foundations which is used widely in cities currently. With the huge bearing capacity, it can resist the complex loads, minish the settlement of the foundation and the superstructure, as well as stand against the additional stress and deformation caused by the traffic movable load and circulating load. However, it is inescapable for the construction of the underground project to pass by the piles, causing the displacement of the surrounding soil that is harmful to the piles. Hence, it is a concern to study the influence of underground engineering construction, cut down the disturbance to the piles and soil so as to control the settlement and deformation of the pile foundation. The paper is based on the load transfer function, to research the development process of the side fictional resistance.(1) Integrate the load transfer principle and shearing displacement method to set up the load transfer equation between the pile of soil, using the discrete and fitting methods to solve the equation so as to educe the pile displacement of arbitrary section as well as the analytical solution. Comparing the results with the soil settlement solved by the Mair equation, the relative displacement can be gained.(2) Based on pile displacement, the strain of the arbitrary section can be settled out, as well as the axial force and side fictional resistance. To build the function relation between the side fictional resistance and relative displacement, which is just theτ～z curve, then compare it with the existing load transfer model to investigate the development process.(3) According to the different location, select three representative piles to study the reaction of piles and soil under the certain conditions as different pile length, different volumn loss rate,different pile top axial force and different horizontal distance, in order to summarize the differing variation process of the settlement and axial force as well as theτ～z curve. |
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