Bridge Pile Bearing Characteristics Of The Centrifuge Model Test

This paper have put to nine clusters pile and pile group centrifuge modeling test by the 60gt centrifuge of Chang'an university, studied the load and displacement relationship and axial loads distribution on pile shaft for pile-side post pressure grouting, different soil conditions, different numbers of piles and different pile spacings. The paper draws some valuable conclusions: frictional force in side-pile is enlarged obviously and subsidence decreases even reach 20% after pile-side post pressure grouting ; Under bending loads, each pile of pile group sharing the load is not simply average; Under the loess foundation, negative friction is not ignored because of rapid subsidence of soil, howener, this phenomenon is not appered in sand foundation. In addition, using Marc program, the paper analyses the testing results of centrifuge modeling test, throughing select computation parameters, the reslut is convergenced gradually. The computation results indicate that the consequences accorde with the numerical simulation under sand foundation, but there is difference under the loess foundation.