J Korean Soc Hazard Mitig 2018; 18(1): 199-207  https://doi.org/10.9798/KOSHAM.2018.18.1.199
Study of Method for Estimating Various Geotechnical Properties to Prevent Debris-flow
Lee, Seung-Jae*, and Yoon, Hyung-Koo**
*Member, Undergraduate Student, Department of Construction and Disaster Prevention Engineering, Daejeon University
**Member, Assistant Professor, Department of Construction and Disaster Prevention Engineering, Daejeon University
Correspondence to: Member, Assistant Professor, Department of Construction and Disaster Prevention Engineering, Daejeon University (Tel: +82-42-280-2578, Fax: +82-42-280-2576, E-mail: hyungkoo@dju.ac.kr)
Received: September 30, 2017; Revised: October 18, 2017; Accepted: November 20, 2017; Published online: January 31, 2018.
© The Korean Society of Hazard Mitigation. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The natural disasters cause large and small human and material damages, and domestic cases have been reported due to debris-flow disaster near downtown area. The objective of this study is to suggest the method for estimating composite geotechnical engineering properties to examine the stability of vulnerable areas. In this study, the parameters set as the composite geotechnical properties are the dielectric constant (saturation), electrical resistivity (porosity) and hydraulic conductivity through importance based on the previous research. The samples are collected from area experienced of debris‐flow disaster, and the laboratory tests are performed to measure dielectric constant and hydraulic conductivity. The electrical resistivity is derived from theoretical principle of the time domain reflectometry and the hydraulic conductivity is deduced through constant water head test. The electrical resistivity is derived from the theoretical relationship between the dielectric constant and the electrical conductivity, and the reliability of deduced electrical resistivity ​​is verified through measured values by four electrodes system. The dielectric constant, electrical resistivity and hydraulic conductivity are found to be reasonable values and the distributions of geotechnical properties are plotted by using geostatistical technique. The results show that it is possible to acquire various geotechnical properties through just one experimental procedure, and the detailed distribution is also obtained.
Keywords: Dielectric Constant, Electrical Resistivity, Geostatistical Technique, Hydraulic Conductivity, Laboratory Test


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