瞬时参数在探地雷达公路路基隐患排查中的应用

摘要

由于城市公路路基中的隐患会引起地面沉降和塌陷,对人民的生命财产造成危害,因此对公路路基进行隐患排查十分重要.基于时间域有限差分(FDTD)的GPRMax2D程序,对脱空、富水和土体空洞的情况进行了数值模拟,通过将传统的只包含振幅信息的探地雷达图像与瞬时振幅图、瞬时相位图结合,进行了多参数分析,增加了解释的准确度和可靠性.通过模拟数据和实测数据以及验证结果的对比分析,建立了脱空、富水和空洞的解释分类模型,认为探地雷达在公路路基隐患排查中是一种快速、无损、可靠的技术方法.%The soil debonding and cavity in the roadbeds could cause the collapse and sedimentation of ground, which has damage on life and property of people.Thus, it is important to detect roadbed's perils.This paper used the simulation software GPRMax2D based on finite-different time-domain method to the forward simulation radar images of the soil cavity, more moisture in soil and the soil debonding were obtained.In addition, we combine the traditional GPR image with transient phase and amplitude image to make multi-parameter analysis, which could add the accuracy and reliability of interpretation.According to the comparative analysis with numerical simulation data, GPR survey profile and verification result, this paper establishes a interpretation classification model of the soil cavity ,the soil debonding and more moisture in soil.The GPR is a rapid, nondestructive, reliable technique which can be used to detect the hidden perils of roadbed.