Research On Detectability Of Ground Penetrating Radar For Oil Contaminated Site

The after underground storage tanks or pipelines aging, leakage of oil could spill and soak into soil, then change the physical properties, structure of soil, which may pose a serious threat to underground water and human health, so pollution caused by underground oil material has become one of the widespread concerns in the geotechnical environment field. After a long-term theoretical research and practical application, ground penetrating radar technique has achieved good results in underground oil polluted area survey, and show some notable characteristics of in suit, nondestructive, rapid. In order to quantitatively evaluate oil content of contaminated soil, and improve the advanced application of profile information of ground penetrating radar, based on the lab test, typical characteristic of GPR profiles of oil contaminated soil were summarized in this paper and analyzed detectability of GPR for oil contaminated site, then try to find out relationships between dielectric constant and pollutant content of contaminated soil and set up dielectric model.Thesis is divided into six chapters. The first chapter introduces the related research situation at home and abroad, main contents and technical route. The second chapter provides detailed introduction to ground penetrating radar in terms of detection theory and important technical parameters. By ground penetrating radar detecting results of different size grading of oil contaminated sand sample, GPR profile characteristics of contaminated soil with different oil saturation and different water saturation are summarized and analyzed in the third chapter, then comparing it with other research results, and analyze the detectability of ground penetrating radar on oil contaminated site by using of numerical simulation results. Research indicates that dielectric constant of contaminated site has little changeable, and the GPR profile also has no significant difference, when dry sand is polluted by oil, but reflection amplitude has slight increase; When sand filled with water is contaminated by oil, GPR profiles show distinct anomalies in the contaminated site, and with the contaminated range expend and oil content increase, reflected wave energy will enhance. In the forth chapter, dielectric relationship is established by using measured dielectric constant of oil contaminated sand with different original water content through reflected method and oil content, and the formula show that the relationship between oil content and dielectric constant of contaminated soil followed modified CRIM. Chapter five through monitoring the process of diesel leakage by GPR to prove the conclusions of chapter four. The study confirmed GPR technology is effective for mapping contaminated site and oil content. Finally, the fifth chapter gives the paper's overall conclusions and further work.Through characteristic generalization of GPR profile of oil contaminated soil and set up dielectric model by using of reflection method, this paper lays a good foundation for further study of pollutant quantitative evaluation of oil contaminated soil.