Research On The Dynamic Response Of Pile Foundation In Mountain Slope Under Earthquake Action

In the western mountain highway construction，to meet the alignment and protect theenvironment，the bridges are often one of the main structure forms across mountainslopes.The bridge plie foundation which locates at steep slope compares to the generalanti-slide pile seems to be much more complicated，and under dynamic loads of theearthquake，this situation has become particularly evident. However，anti-seismic theory andthe design specifications for the mountain slopes pile foundation are relatively small.Therefore，Launching a research for anti-seismic performance of pile foundation in slopebecomes significant.The main work of the paper are as follows：(1) Firstly, Starting from the bearing mechanism of laterally loaded piles and bearingpiles, and then gradually in depth probing into the bearing mechanism of the slope pilefoundation under dynamic loads of the earthquake，getting a conclusion of the uniquecharacteristic of the mountain slopes pile foundation bearing mechanism，it will produce theso-called P-Δ effect.(2) Selected to analyze soil dynamic constitutive relation，D-P model is choosed asdynamic constitutive relation of soil in this paper.(3) Considering the viscoelastic boundary condition which can simulate real reflectionand refraction of the earthquake and energy dissipation problem, using a consistent clayboundary to handle the model boundary，and carrying on the case analysis through thesoftware, As a result，Consistent with viscoelastic boundary concentration are well consistentwith viscoelastic boundary.(4) making comparative analysis of dynamic response of mountain slope which with pilefoundation and without，as a conclusion，the pile foundation has the key protection toanti.seismic of mountain slope.(5) In order to further study the dynamic response of a bridge pile foundation slope areafeature, the paper uses the Ansys software, and making a contrastive analysis of the numericalsimulation for the dynamic response of a bridge pile foundation by inputing the two differentkinds of seismic waves at the bottom of the model，Obtaining that the dynamic response of a pile foundation features is closely related to the seismic wave input under the condition offixed venues，When the frequency is close for both，the dynamic response of a pile foundationis especially obvious. And it is concluded that the slope has extrusion effect to pile foundationunder seismic loading, and the pile foundation will cause the soil uplift in order to stop slopeof the sliding.