The Pile Foundation Under The Action Of Dynamic Compaction Vibration Wave Dynamic Response Analysis

This paper is the construction of the Ukraine National Highway(Weifang to Rizhao engineering section)as engineering background,to meet engineering construction problems: design and barrier of dynamic compaction vibration influence on adjacent pile size and isolation barrier filling material selection problem,combined with the dynamic hysteresis model Winkler using the basic principle of soil body dynamics and structure dynamics,considering the pile-soil coupling,the tamping point vibration compaction,vibration wave propagation and compaction effect of pile foundation adjacent to the horizontal and vertical vibration response,the barrier isolation effect of several aspects of the theoretical and numerical results are analyzed,specific the results obtained are as follows:(1)Find the displacement hammer at the center of the window is a half cycle sine curve,analyzes the compaction points of amplitude and frequency changes with dynamic offset.(2)On the basis of the three dimensional vibration equation of the axisymmetric condition,the three-dimensional vertical vibration model of pile soil coupling is established.Based on the vibration equation of pile and soil,the mathematical expression of the vertical vibration displacement and dynamic internal force of pile is deduced.The soil around the pile into the soil layer under the condition of the dynamic compaction vibration wave under the influence of the transfer matrix calculation of pile displacement and internal force between layers,and numerical calculation is carried out according to the engineering background data,analysis of the vertical vibration law in dynamic compaction vibration under the influence of pile foundation.(3)According to the foundation beam model of delay dynamic differential equation by Winkler,pile horizontal vibration,deduces the pile of soil into the soil layer under the condition that the transfer matrix of the level of pile dynamic response between layers,combining with the actual project,analysis of the dynamic compaction effect of pile foundation under horizontal vibration.(4)Under the influence of dynamic compaction vibration,the horizontal and vertical dynamic responses of piles are exponentially attenuated as the distance between tamping point and pile top increases.According to the requirement of deformation control index,the minimum safe construction distance between tamping point and pile top in engineering background is determined.(5)The isolation principle of vibration isolation barrier to dynamic compaction vibration wave is analyzed.Based on the superposition principle of wave,the formula of P wave and SH wave amplitude attenuation coefficient is deduced.(6)According to the engineering background,this paper analyzes the influence of the width of the isolation barrier,the density of the filling material and the angle of incidence on the attenuation coefficient of P wave and SH wave.It also puts forward some suggestions for the design and construction of the isolation barrier.