Journal of MMIJ
Online ISSN : 1884-0450
Print ISSN : 1881-6118
ISSN-L : 1881-6118
Original Paper - [Special Edition] Mining, Monitoring, and Measures for Stabilizing the Rock Slope of Mt. Buko -
Analyzing the Impacts of Rainfall on Rock Slope Behavior in Une Mine and Evaluating the Effec-Tiveness of Countermeasure Methods
Noriyoshi OZAWA
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JOURNAL OPEN ACCESS

2018 Volume 134 Issue 11 Pages 208-221

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Abstract

Forward and downward displacements were measured in a section of a limestone slope in the Une mine, Ryoko Lime Industry Co. Ltd. Although the causes of rock slope behaviors at Une site have not been clarified, but rainfall unambiguously impacts on the rock slope. Une mine has taken countermeasures that are generally considered to be effective to stabilize the rock slope without delay. In this study, displacements were monitored using a crack gage installed over the fracture plane in an observation crosscut excavated in the rock slope on 1,010 mL. And it is found, the measured fracture displacements can be classified into two types: Type 1 displacement not directly related to rainfall and Type 2 displacement due to rainfall. All the displacements observed on the monitoring points located on the rock slope and by the crack gages installed other than 1,010 mL were analyzed and found to be composed of the Type 1 and Type 2 displacements. The areas with a large impact of rainfall were identified and the geological/geotechnical characteristics of the areas were investigated to prepare new countermeasures. In order to evaluate the effects of the countermeasures, the author formulated a statistical equation predicting the rock slope displacements from the rainfall history before applying any countermeasures for stabilization. It is confirmed the statistical equation gives a fairly fine agreement between actual and predicted displacements before commencing the countermeasures reducing the rainfall impacts. In addition, the statistical equation also makes possible the quantitative evaluation of the effects of the countermeasures, namely difference between predicted displacement without any countermeasures and observed displacement after activating the countermeasures. As a result, the statistical equation will be used for planning comprehensive and strategic stabilization projects in future for the Une rock slope.

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© 2018 The Mining and Materials Processing Institute of Japan

この記事はクリエイティブ・コモンズ [表示 - 非営利 - 改変禁止 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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