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http://dx.doi.org/10.14578/jkfs.2019.108.2.216

The Geology and Variations of Soil Properties on the Slow-moving Landslide in Yangbuk-myun, Gyungju-si, Gyeongsangbuk-do  

Park, Jae-Hyeon (Department of Forest Resources, Gyeongnam National University of Science and Technology)
Park, Seonggyun (Department of Forest Resources, Gyeongnam National University of Science and Technology)
Publication Information
Journal of Korean Society of Forest Science / v.108, no.2, 2019 , pp. 216-223 More about this Journal
Abstract
This study was conducted to measure the changes in the geological and soil properties following slow-moving landslide events in Yangbuk-myun and Gyungju-si, Gyeongsangbuk-do, South Korea. The geological characteristics of the study site comprised black shale in the Gyeongsang nodal group formed in the Cretaceous period and quartz feldspar carcinoma in the east side with conglomerate in the Yeonil group formed in the Quaternary period. The study site exhibited the geologic characteristics of a slow-moving landslide with severely weathered rocks. The maximum collapsing depth of the slow-moving landslide was 12.0 m with colluvial deposits. The strike and joint aspects in the slope areas of the slow-moving landslides were $N46^{\circ}E$ in lower slope and $N62^{\circ}E$ in upper slope, respectively. Soil hardness of ${\leq}20cm$ deep was not measured because of the completely disturbed soil resulting from soil creeping. Soil from 25 to 90 cm deep was 1.4-4.7 times softer in the slow-moving landslide areas than in the undisturbed or natural forests. Soil bulk density was $1.24-1.29g/cm^3$ in land creep areas. Soil bulk in both areas was 1.6 times denser than that in the natural forest. The soil pore space was 51.5-53.3% in the land creep areas. The values are 1.3-1.4 times lower than those within the natural forest. Black shale areas showed the lowest coefficient of permeability (8.75 E-06 cm/s) and mesopore ratio (pF 2.7: 9.8%) compared with those resulting from other study areas.
Keywords
geological and soil properties; the slow - moving landslide; black shale; soil bulk density; mesopore ratio;
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