Dynamic Soil-pile-structure Seismic Model Test And Numerical Simulation Study In Liquefied Ground

Extensive research have been carried out at home and abroad on soil-pile-structure dynamic interaction, which is one of the hotspot and difficulty in the field ofthe current seismic design of bridge, because of complexity of saturated sandliquefaction, So while obtaining some important theory, but also did not form aunified conclusion of the research, At present, the seismic model test study is mainlythrough pile-soil-structure dynamic interaction, which can measure strain andacceleration of internal parameters such as soil samples; You can look for liquefactionof saturated distribution of pore water pressure in sand, Can see the macro testdevelopment process.This article has carried on the liquefied soil foundation soil-pile-structuredynamic interaction system seismic experiment, through which we can have verygood understanding to the ground of liquefaction under earthquake action of soil-pile-structure dynamic interaction rules system and macroscopic phenomena, In addition,the model is analyzed by using SAP2000software, and compared with theexperimental results, in order to understand the mechanism of liquefaction ofsaturated sand.The numerical analysis results are obtained through the test data and software forseismic station, summarize the main results are as follows:1、In the0.1g under the action of earthquake, saturated sand layer produced noliquefaction, and disappeared rapidly after seismic pore pressure. Peak strain appearsin the upper part of foundation.2、In the0.4g seismic waves under the action of of rapidly rising pressure,saturated sand layer hole, at the same time saturated sand layer appeared liquefaction,seismic wave input after the end of the pore pressure decay slowly, After the inputload for a long time pore pressure still exists.The peak strain in down position.3、In the0.1g and0.4g seismic waves under the action，Pier top accelerationamplification were more significant.