Development of field techniques for measuring hysteretic soil hydraulic properties and pore air pressure of unsaturated soils

非饱和土地基中会产生典型的岩土工程灾害，如强降雨引起的边坡失稳和渗流引起的堤坝失稳。为了预防这些岩土工程灾害的发生，人们注意到，现场测量和评价土壤水力学特性是实用和准确预测非饱和土壤水分运动的必要条件。本文提出了一种测定非饱和桑迪近地表土壤水力特性的新方法。利用地表探地雷达技术对均质桑迪非饱和渗流的时空变异性进行了无损测量。原位试验在非饱和土安全性研究中的应用。数值渗流分析和现场入渗试验验证了本文方法的有效性。

Typical geotechnical disasters, such as heavy rainfall induced slope failures and the levee failures caused by seepage, are caused in unsaturated ground. For the prevention of these geotechnical disasters, it is well noticed that in-situ measurement and evaluation of the soil hydraulic properties are essential to practical and accurate prediction of water movement in unsaturated soils. In this study, a new field experimental method of determining the soil hydraulic properties in the near surface of unsaturated sandy soils is proposed. Surface ground-penetrating radar was assessed as a non-destructive method to measure the temporal and spatial variability of unsaturated seepage flow on a homogeneous sandy soils. The in-situ tests for applying the safety investigation of unsaturated soils. The utility of our proposed methods was demonstrated by using numerical seepage flow numerical analysis and field infiltration experiments.