Study on Generalized Sealing Relationship for Dynamic Centrifuge Model Tests of Soil-Structure Systems

本研究旨在验证一个新提出的广义比尺关系的动力离心模型试验的土结构系统。广义标度关系是通过虚拟1g场模型的概念组合1g场和离心场的标度关系，从而指定两步标度程序上的标度因子带。在本项目为期两年的时间里，在新的模型建立时间的基础上，对桩土系统和水平场地模型进行了广义比尺关系的适用性研究，并对桩土系统进行了离心加速度场为5 ~ 50 g、几何比尺系数为100（=原型/模型）的模型试验。模型的建模结果支持广义标度关系的加速度和位移在桩顶的适用性，弯矩分布在桩的离心加速度场小于20 g。广义比尺关系在更大离心加速度场中的适用性有待进一步研究，为此进行了水平场地模型试验，重点研究了广义比尺关系适用性的一个基本方面。离心加速度场的范围从1g到70 g，比桩-土系统所用的范围宽得多，几何比例因子为100。模型的建模结果支持广义尺度关系的剪切波速度使用Ricker波和加速度响应使用正弦波的适用性。

This study aims at validating a newly proposed generalized scaling relationship for dynamic centrifuge model tests of soil structure systems. The generalized scaling relationship is a combination of the scaling relationships for 1g and centrifuge fields through a concept of virtual 1g field model and thereby specifies scaling factors band on the two step scaling procedure. Within the period of two years of this project, applicability of this generalized scaling relationship was studied for a pile-soil system and a level ground model based on a new time of modeling of models.Model tests on the pile-soil system were performed with the centrifugal acceleration fields ranging from 5 to 50g with a geometrical scaling factor of 100(=prototype/model). Results of the modeling of models support the applicability of the generalized scaling relationship for acceleration and displacement at the pile top, and bending moment distribution over the pile for the centrifugal acceleration field less than 20g. The applicability of the generalized scaling relationship for a larger centrifugal acceleration field remained a problem to be studied further.Model tests on the level ground were performed in order to focus on a fundamental aspect of the applicability of the generalized scaling relationship. The centrifugal acceleration field ranging from 1g to 70g, that spans a much wider range than that used for the pile-soil system, was applied with a geometrical scaling factor of 100. Results of the modeling of models support the applicability of the generalized scaling relationship for shear wave velocity using a Ricker wave and acceleration response using sinusoidal wave.