NDLI: Undrained torsional shear tests on gravelly soils

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A fluidized landslide on a natural slope by artificial rainfall

Landslide risk evaluation and hazard zoning for rapid and long-travel landslides in urban development areas

Rock avalanches of the Ardon River valley at the southern foot of the Rocky Range, Northern Caucasus, North Osetia

The Khyex River landslide of November 28, 2003, Prince Rupert British Columbia Canada

Landslides : Volume 1, Issue 2, July 2004

Landslides : Volume 1, Issue 1, March 2004

Undrained torsional shear tests on gravelly soils

Content Provider	Springer Nature Link
Author	Kuenza, Karma Towhata, Ikuo Orense, Roland P. Wassan, Talib H.
Copyright Year	2004
Abstract	Slope instability and landslides are frequently triggered during heavy rainfalls in mountainous areas. Geomaterials that are subject to this type of failure normally include coarse grains, which are made by weathering of mother rocks. These materials are called sandy gravel or gravelly sand in soil mechanics, depending upon the amount of gravelly components. This situation suggests a need for laboratory investigations that aim to understand the shear behavior of sand with gravel toward failure. Another feature of this type of failure is a quick rate of slope failure that is reasonably considered as an undrained process of shear distortion. Hence, the present study investigated by means of experiments the undrained shear behavior of sand with gravel. The torsion shear tests on hollow cylindrical specimens concerned the effects of gravel content on the undrained shear behavior. The tests revealed that the effect of gravel content is twofold. When the gravel content is relatively small, the effects of the sandy component are more important. Hence, the relative density of the sandy matrix among gravels has a predominant influence. In this situation, therefore, the overall relative density is a less important index to account for the shear behavior. In contrast, when the gravel content exceeds a threshold value, the amount of gravel comes to have a more predominant influence than the sandy matrix. This is probably because gravel particles start to have contact with each other to form a structural matrix of gravel grains that governs the overall stress–strain behavior. These results were summarized in three-dimensional diagrams that related the strength properties of gravelly sand varying with the density of sand matrix or the density of sand–gravel mixtures as well as the gravel content.
Starting Page	185
Ending Page	194
Page Count	10
File Format	PDF
ISSN	1612510X
Journal	Landslides
Volume Number	1
Issue Number	3
e-ISSN	16125118
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-08-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geotechnical Engineering and Engineering Geology

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