长江科学院院报2018，Vol.35Issue(3)：110-115,6.DOI:10.11988/ckyyb.20171083
基于地质雷达法的非饱和黄土介电特性及界面反射机理研究
Research on Dielectric Property and Interface Reflection Mechanism of Unsaturated Loess by Ground Penetrating Radar
摘要
Abstract
The dielectric property of loess and the reflection mechanism and law of ground penetrating radar (GPR) wave are studied in this article.Through tests on the relative permittivity and conductivity of unsaturated lo-ess,the inner relation between relative permittivity and three phases (gas,liquid,and solid) is analyzed. Moreo-ver,the mathematical-physical relations of relative permittivity versus compaction degree and moisture content are obtained. The influence of GPR antenna frequency on the moisture content-permittivity relation is also analyzed.Re-sults suggest that relative permittivity of unsaturated loess is positively related with moisture content and compaction degree;given the same loess sample,relative permittivity is positively related with antenna frequency. In addition, the interface reflection numerical model of relative permittivity versus moisture content is built,indicating that echo intensity of GPR grows with the increase of moisture content. The above conclusions are of guiding significance for GPR detection of unsaturated loess engineering.关键词
非饱和黄土/地质雷达/相对介电常数/含水率/时域有限差分方法/界面反射Key words
unsaturated loess/ground penetrating radar/relative permittivity/moisture content/finite-different time-domain forward/interface reflection分类
建筑与水利引用本文复制引用
吕高,杨杰,李宁,胡德秀..基于地质雷达法的非饱和黄土介电特性及界面反射机理研究[J].长江科学院院报,2018,35(3):110-115,6.基金项目
中国博士后自然科学基金项目(2017M613175) （2017M613175）
国家自然科学基金项目(11572246) （11572246）
国家重点实验室培育基地基金项目(2016ZZKT-8) （2016ZZKT-8）
陕西省自然科学基金青年项目(2018JQ5203) （2018JQ5203）
