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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.63  No.3 (2014)  >  pp.271-278

Journal of the Society of Materials Science, Japan
<<Previous article Vol.63  No.3 (2014)   pp.271 - 278 Next article>>

A Study on Mechanism of Slope Failure Caused by Short Term Torrential Rainfall

Hiroyasu OHTSU1), Yoshito MAEDA2), Hiroshi MASUDA3), Kenzi TAKAHASHI4), Mitsuru YABE5)
1) Grad. Sch. of Urban Management, Kyoto University. 2) West Nippon Expressway Company Limited, Research and Development Command. 3) Grad. Sch. of Urban Management, Kyoto University. 4) Suimon Gizyutu Consultant 5) OYO Corporation

Recently, the frequency of rainfall induced landslide has drastically been increasing in Asian countries due to climate change. Also in Japan, shallow landslide caused by torrential rainfall, which was rarely observed in the past, has frequently occurred. Therefore, it is important to clarify the mechanism of rainfall induced slope failure in order to mitigate landslide risks. From such a viewpoint, authors have conducted field monitoring in Thailand, considering the similarity of precipitation characteristic between squalls in Thailand and torrential rainfall in Japan. Based on the results of field monitoring, this study proposes the methodology to investigate numerically the effect of rainfall infiltration into subsoil on slope stability, by focusing on the decrease of shear strength of the unsaturated soil due to increase of volumetric water content at relatively shallow area. The results show that the decrease of shear strength due to rainfall infiltration at the toe portion may become the trigger of shallow landslide.


Keyword:
Rainfall, Slope stability, Weathered soil

Received: July 10, 2013
Published online: March 20, 2014
Copyright © 2014 by The Society of Materials Science, Japan

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