Analysis Of Adjacent Surcharge Impact To The Internal Force And Displacement Of High-speed Railway Bridge Pile Foundation In Deep Soft Soil

ABSTRACT:In order to achieve the operation objectives of high speed and safety, ballastless track was widely used in newly built high speed railway, how to ensure the track regularity is the key technology of high speed railway construction and operation.Pile foundation come into common use in high-speed railway bridge of deep and thick soft ground. As the economy of the distrct along the rail develops,it is inevitable to encounter the effect of adjacent surcharge, lead to subsidiary stress increase in the foundation, cause influence to the track regularity.In this paper, combined with theoretical analysis, field investigation and numerical simulation method, the adjacent surcharge impact to the internal force and displacement of high-speed railway bridge pile foundation in deep soft soil were researched. Following are some main issues and achievements:(1)Based on the comprehensive analysis of related research status at home and abroad, developed the research content and the technical route of this paper;(2)Based on the elastic half-space theory,we generator the calcul-ation program,use which calculate the Stress acting on the pile created by the heap load.we simplify the Stress acting on the pile as the concentrated load,which act on the pile,and apply different spring rate on different soil layer,improve the calculation program of the finite difference method to solve beam on elastic foundation,and apply the program on actual engineer,get good effect;(3)We conside the horizontal bar of the procedure static analysis of plane rigid frame as the elastic support, use this program to calculate the influence of the internal forces of the pile created by the yawing force,and contrary to the result calculated by the finite difference method to solve beam on elastic foundation,and analysis it,accordingly,it proves the method available;(4)Using the control variable method, this article analyzes the changing rule of pile bending moment and the pier top displacement caused by the change of the heap load width,the heap load space and the heap load height;(5)We use FLAC3D to analysis deform of bridge pile and declsour the factors of deform caused by heaping,and get some results of reference value to the design and construction.