Parametric Study On Seismic Response Of Bridge Pile-group Foundation In Liquefying Soils

Soil liquefaction is one of the important cause of the pile foundation bridge seismic damage.Pile soil liquefaction ground dynamic interaction research is the effective way to solve the problem of liquefied soile bridge pile foundation aseismic.Pore water in the liquefied soil of bridge pile foundation damage, the earthquake is difficult to discharge is the main cause of liquefiable soil dynamic properties change, soil pore water pressure in the rising cause a lower effective stress and the intensity of lead to the strength of the soil loss or complete loss, which seriously affect the stability of the bridge pile foundation, or make the seismic performance of complete loss rather than a bridge collapsed.In view of the above, the pile soil liquefied area, the author of this paper, the problem of earthquake interaction shaking table test and theoretical analysis method, the combination of liquefied soil of bridge pile foundation seismic response and influencing factors of research work.This paper main research work and made a number of known as follows:Using reinforced concrete pile-column pier foundation, in view of the liquefied ground surface covering clay layer, the implementation of liquefiable soil bridge seismic response of vibration table test of pile foundation, bridge pile foundation in the process of soil liquefaction is studied the dynamic characteristics of seismic response law and venue.And based on the Open Sees finite element numerical simulation platform, directly to the shaking table test, pile based on euler Bernoulli beam theory to establish the beam-column unit simulation, dynamic pile-soil interaction with considering the effect of volume unit dealing with rigid co nnection, establish a test under controlled conditions pile soil liquefaction ground dynamic interaction of the three dimensional finite element analysis model and the corresponding calculation method.Through the pile foundation near field acceleration, pore pressure, stress of pile soil and shaking table test results of the comparative analysis, numerical simulation to verify the finite element analysis model is established and the corresponding calculation method is correct.Using three-dimensional finite element analysis model is established and the corresponding calculation method, based on the shaking table test, promotion to the practical engineering, in view of the liquefied soil bridge pile-soil-structure dynamic interaction, enter the El Centro wave by numerical simulation, in order to block, high pier, pile spacing, the upper soil layer permeability coefficient and so on as the basic control volume, set up the near-field acceleration of soil under different parameters, soil effective stress decreasing ratio, bending moment and shear force of pile,pile displacement and acceleration time history curve, and analysis the main factors of the effect of pile soil dynamic interaction in the.To the 2×2 pile numerical model as the foundation, expand the 2PS pile model(2 Piles in Series), 2PP pile model(2 Piles in Parallel), 3PS group pile model, 3PP group pile model, 3×3 pile group model.According to the above numerical model used variables, according to different configuration of pile soil pile foundation o n liquefied soil earthquake interaction analysis about the influence of concrete.