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Estimating Soil Thickness in a Debris Flow using Elastic Wave Velocity
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  • Journal title : The Journal of Engineering Geology
  • Volume 26, Issue 1,  2016, pp.143-152
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2016.1.143
 Title & Authors
Estimating Soil Thickness in a Debris Flow using Elastic Wave Velocity
Min, Dae-Hong; Park, Chung-Hwa; Lee, Jong-Sub; Yoon, Hyung-Koo;
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To estimate the stability of a debris flow it is necessary to know the mass of surface soil, cohesion, slope, and friction angle. Given that the mass of surface soil is a function of soil thickness and mass density, it is important to obtain reliable estimates of soil thickness across a wide area. The objective of this paper is to estimate soil thickness using the elastic wave velocity with a new standard velocity. Tests are performed in debris-flow hazard areas, after which four profiles are selected to obtain the elastic wave velocity. Dynamic cone penetration tests are carried out to find the soil thickness at 18 points. The elastic wave velocity shows the area consists of 3~4 layers, and soil thicknesses are predicted by utilizing the new standard. The elastic wave velocity and dynamic cone penetration tests yield large differences in soil thickness. Therefore, this study shows that the new standard is useful not only in estimating soil thickness but also in improving the reliability of estimates of soil thickness.
debris flow;dynamic cone penetration test;elastic wave velocity;layer;seismic survey;soil thickness;
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