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The Scientific World JournalVolume 2013 2013, Article ID 603130, 10 pages

Research Article

Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

Received 8 March 2013; Accepted 12 April 2013

Academic Editors: F. V. De Blasio, K. Nemeth, and G. Racki

Copyright © 2013 Jian Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, the failure behaviors of debris flows were studied by flume model tests with artificial rainfall and numerical simulations . Model tests revealed that grain sizes distribution had profound effects on failure mode, and the failure in slope of medium sand started with cracks at crest and took the form of retrogressive toe sliding failure. With the increase of fine particles in soil, the failure mode of the slopes changed to fluidized flow. The discrete element method can overcome the hypothesis of the traditional continuous medium mechanic and consider the simple characteristics of particle. Thus, a numerical simulations model considering liquid-solid coupled method has been developed to simulate the debris flow. Comparing the experimental results, the numerical simulation result indicated that the failure mode of the failure of medium sand slope was retrogressive toe sliding, and the failure of fine sand slope was fluidized sliding. The simulation result is consistent with the model test and theoretical analysis, and grain sizes distribution caused different failure behavior of granular debris flows. This research should be a guide to explore the theory of debris flow and to improve the prevention and reduction of debris flow.





Autor: Jian Zhou, Ye-xun Li, Min-cai Jia, and Cui-na Li

Fuente: https://www.hindawi.com/



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