Research On Shake Table Test Of Liquescent Foudation Consolidated By Cement-Soil Mixing Pile

Liquefaction of saturated sand soil and saturated silt during earthquake is an important subject of Geotechnical Engineering. Cement-soil pile has been widely used in soft-soil foundation consolidation, and its improvement in the vertical foundation bearing capacity is also proved. However, study on anti-liquefaction of cement-soil pile is still inadequate, especially there is lack of experimental data of its seismic representation while used in consolidating powder sand, mucky soil and silt mixing ground.This paper took "Consolidation of Yumeng railway weak ground "as a prototype, having developed a 1:10 scale shaking table model test on cement-soil pile used in consolidating silt and powder soil mixing foundation.The test gave a reappearance of all kinds of macroscopical earthquake disasters resulted from natural seisms, and by analyzing the experimental data of displacement, pore pressure and acceleration etc., got some useful conclusions as below:1.The silty sand remains steady during the process of experiments, and it is safe and feasible as the bearing stratum.2.During the loading of seismic waves, liquefaction took place in the silt of medium and high stratum beyond the toes of side slopes, and in the underlayer silt there was not liquefaction occurred.3.In the foundation under the roadbed, with the accretion of the overlying vertical stress, liquefaction potential reduced gradually. To the foundation under the shoulder, the pore water pressure is far below the initial liquefaction criterion, both silty sand stratum and silt stratum.4.Answering acceleration of the surface to the subgrade and the foundation increases with the increasing of the input acceleration. Because of the shock absorbtion by the cushion, answering acceleration of the surface to the foundation is little smaller than that of the surface to the subgrade.Moreover, by introduction of the whole process of the test from plan, practice to data analysis, the paper hope to provide some useful reference for the successors.