00406488

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ロッコウサン チイキ ノ キュウケイシャチ ホウカイ キケン クイキ ノ カコウガン シャメン ノ フウカ ヘンシツ コウブツ ト ゲンソ ヨウダツ ニヨル フウカド

Grade of weathering of the steep slopes due to the alteration minerals and further leaching of the granitic rocks in mount Rokko area

Japanese (日本語)

神戸大学都市安全研究センター研究報告

7

237-255

神戸大学都市安全研究センター

2003-03

2007-04-17

The steep slopes are widely distributed in Mount Rokko. These steep slopes were composed of deep weathered granitic rocks. The grade of weathering of the granitic rocks is much heavier in western part of Mount Rokko compared with that of the eastern part. Altered minerals in the steep slopes were identified by X-ray diffraction to estimate of weathering products. Chemical composition of the many rocks in the steep slopes was also analyzed by using EDXRF to check the grade of weathering. In the collapre of steep slopes, readily leachable is clear. The leaching tendency coincides with the grade of the weathering. It is possible that the examination by the chemical composition quantitatively shows the progress of the weathering of the steep slopes. Many slope failures have heavy weathered minerals such as kaolinite by using X-ray diffraction. As the result of analysis of the EDXRF and weathered minerals, the tendency of weathering progresses is much further than the grade of weathering from field survey. From these results, it seems to be possible to generate a collapse by the heavy rainfall. The quantitative relationship between the possibility of amount of rainfall and collapse should be clarified.

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