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

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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.