NDLI: Geotechnical and rheological characteristics of waste rock deposits influencing potential debris flow occurrence at the abandoned Imgi Mine, Korea

Content Provider	Springer Nature Link
Author	Jeong, Sueng Won
Copyright Year	2015
Abstract	Mass movements associated with abandoned mines are dangerous and destructive. Local communities near abandoned mine sites are often threatened by the effect of extreme precipitation events on these sites. In this study, the geotechnical and rheological characteristics of mine deposits were examined to delimit the hazardous areas near abandoned mines. Waste rock materials were collected from a pyrophyllite mine deposit in the mountainous region of Korea, and a sieve analysis was performed to determine the grain size distribution. The yield stress in the debris flow modeling was determined using fall cone and rheometric tests. Rheological tests were performed on materials finer than 4.75 mm using a ball-measuring system rheometer. These samples were mainly composed of gravels and sands with small clay content. The waste materials typically exhibited a shear-thinning behavior within a given shear rate ranging between 10$^{−5}$ and 10$^{2}$ s$^{−1}$. The yield stresses obtained from the rheometric tests agreed well with those obtained from the fall cone tests. For the input parameter, we selected the yield stresses ranging from 100 to 500 Pa. As a case study, the debris flow mobility associated with the abandoned mine was examined using a one-dimensional flow dynamic model. The runout distance and velocity of the waste materials are strongly dependent on the yield stress; both factors significantly increase with decreasing yield stress. However, even under the highest yield stress (i.e., 500 Pa), the failed mass can flow into the mountain stream. Thus, the physico-chemical contaminations of areas downslope of abandoned mines may be unavoidable with respect to extreme rainfall events.
Starting Page	8299
Ending Page	8310
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	12
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-01-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Abandoned mine Rheology Yield stress Waste rock materials Debris flow mobility Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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