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Diagnosis of Pavement Structure Based on Spectxal Analysis of Surface Wave

基于面波谱分析的路面结构诊断

基本信息

批准号：
13650512
负责人：
MATSUI Kunihito
金额：
$ 1.73万
依托单位：
Tokyo Denki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The purpose of this study is to develop a method to diagnose pavement structure using surface wave propagation. This is a method of nondestructive testing. The most commonly used nondestructive testing device for pavement is called FWD. According to the FWD, pavement layer moduli are estimated from measured surface deflections assuming layer thickness is known. Surface wave method is a method to diagnose pavement structure using the characteristics that a wave propagation speed in layered media depends on a frequency. It has been said that the method has a potential to estimate not only layer moduli but layer thickness. There are two approaches to estimate those, which are a simplified method and a theoretical inversion. Surface wave test has been aimed to find soil profiles and an applicability of the method to pavement has not been fully investigated. In this study, we examined whether the past findings can be applicable to pavement and we aim to develop a method suitable for pavement. The followings are found on the applicability of the past findings :1. It is impossible to estimate layer thickness using a simplified method.2. Theoretical dispersion curve is essential for inversion but found difficult to obtain in a se of pavement. New findings from this study are as follows :3. Rayleigh wave speed for a surface layer can be found from the test if a high frequency wave can be generated. When the thickness is 10cm, a frequency of 20kHz is required and 50kHz when it is 5cm.4. There is a strong correlation between thickness of surface layer and a slope of nearly straight line in a wave length-phase velocity diagram.

本研究的目的是发展一种利用表面波传播诊断路面结构的方法。这是一种无损检测方法。FWD是目前最常用的路面无损检测设备。根据FWD，假定层厚度已知，根据测量的表面挠度估计路面层模量。表面波法是利用波在层状介质中的传播速度依赖于频率的特性来诊断路面结构的方法。有人说，该方法不仅有可能估计层模量，但层厚度。有两种方法来估计，这是一个简化的方法和理论反演。表面波测试的目的是找到土壤剖面和路面的方法的适用性还没有得到充分的研究。在这项研究中，我们研究了过去的研究结果是否可以适用于路面，我们的目标是开发一种适合路面的方法。本研究对以往研究结果的适用性进行了如下探讨：1.用简化的方法估计层厚是不可能的.理论频散曲线是反演所必需的，但在某些路面中很难获得。本研究的新发现如下：3.如果可以产生高频波，则可以从测试中找到表面层的瑞利波速度。当厚度为10 cm时，需要20 kHz的频率，当厚度为5cm时，需要50 kHz的频率。在波长-相速度图上，表层厚度与一个近似直线的斜率有很强的相关性。