STUDY ON VIBROFLOTATION METHOD TO REINFORCE THE LOESS-LIKE SOIL FOUNDATION

Through in-situ test,this paper validated that the vibro-replacement stone column can be used to reinforce the loess-like soil foundation.The test was carried out on the loess-like soil foundation of Qi-lu petrochemical refinery,and it was found that strength of the soil between piles after vibroflotation is not higher than that of before the vibroflotation.So it is concluded that vibroflotation method can improve the ground bearing capacity of loess-like soil foundation under certain conditions,working current of pile driving can be manipulated to make piles with different pile diameters which can make the foundation strength more uniformity.However,the ground bearing capacity can only be increased by 50% by the large-scale vibroflotation devices with the power of 75 kW,so it is only can be used under certain conditions or while no better choice can be made.