DYNAMIC PROPERTIES OF PILES IN AXIS-SYMMETRY MODEL
三维轴对称基桩动力特性研究

To overcome the short coming in the studies on dynamic properties in which the pile is considered as a one-dimensional pole, this paper studies the dynamic properties of a pile in an axis-symmetry model. A comparison between the two models shows that the ratio of length to radius of the pile influences the eigenfrequencies of the pile. The pile can be analyzed in one dimensional model when eigenfrequencies of high order are neglected, or for the first four eigenfrequencies, the pile ratio of length to radius should be large than 3. Soil-pile stiffness has more influence on the first and second eigenfrequencies of the pile. A method is proposed to calculate soil-pile stiffness by an inverse method with the first and second eigenfrequencies of the pile, so the pile capacity can be computed.