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标度关系，用于土结构系统的动态离心模型试验。广义标度关系是通过虚拟1g场模型的概念将1g场和离心机场的标度关系结合起来，从而规定了两步标度过程中的标度因子带。在本项目的两年时间内，基于模型建模的新时间，研究了该广义标度关系对桩-土系统和水平地面模型的适用性。对桩-土体系进行了模型试验，离心加速度场范围为5 ~ 50g，几何比例系数为100（=原型/模型）。模型的建模结果支持广义标度关系对桩顶加速度和位移的适用性，以及对小于20g的离心加速度场的桩上弯矩分布的适用性。广义标度关系对较大离心加速度场的适用性有待进一步研究。在平地上进行模型试验是为了集中研究广义标度关系适用性的一个基本方面。离心加速度场范围为1g ~ 70g，比桩土体系的加速度场范围大得多，几何比例系数为100。模型的模拟结果支持了广义标度关系对剪切波速（Ricker波）和加速度响应（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.