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- 검색키워드
- 저자 : ( Toru Takeshita ) (검색결과 1 건)
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Estimating Initial Conditions for Formation of Landslide Slip Surface by Microstructural Analysis
( Hiromi Kaji ),( Toru Takeshita ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The purpose of the study is to make clear of initial conditions and formation history of landslide slip surfaces. The sample for this study is from undisturbed drill cores of mudstone from Kushiro area in Hokkaido, Japan. Results of the study so far are: - Three slip surfaces located within 1 m from the landslide slip surface are observed with the naked eyes on a half cut boring core sample. For one of them, structures indicating a reverse fault sense are observed. - Smectite was detected from the current active sliding surface, however a tiny amount of smectite detected from the slip surface considered to have been slipped in the past. - Chlorite was detected by XRD, and also abundant Mg and Fe indicating chlorite were observed by SEM-EDS elemental mapping in the slip surface considered to have been slipped in the past. Those results suggest that one of observed slip surfaces is a fault itself, which was affected by hydrothermal alteration generating chlorite. In fact, since coal layers (Kushiro coal mine) occur in proximity to the research area, there is a possibility that hot water may have migrated and provided these with heat necessary for maturation of coal, and also influenced the formation of slip surface. From now on, we would like to consider the initial conditions under which landslide slip surface was formed by clarifying the formation history of the target area.
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