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http://dx.doi.org/10.7843/kgs.2017.33.12.7

Effects of Grain Size Distribution on the Shear Strength and Rheological Properties of Debris Flow Using Direct Shear Apparatus  

Park, Geun-Woo (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Hong, Won-Taek (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Hong, Young-Ho (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Jeong, Sueng-Won (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Jong-Sub (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.33, no.12, 2017 , pp. 7-20 More about this Journal
Abstract
In this study, effects of grain size distribution on the shear strength and rheological properties are investigated for coarse- and fine-grained soils by using direct shear apparatus. Shear strengths are estimated for fine-grained soils with the maximum particle size of 0.075 mm and coarse-grained soils with the maximum particle size of 0.425 mm and fine contents of 17% prepared at dry and liquid limit states. The direct shear tests are conducted under the relatively slow shear velocity, which corresponds to the reactivated landslide or debris flow after collapse according to the landslide classification. In addition, for the evaluation of rheological properties, residual shear strengths for both fine- and coarsegrained soils prepared under liquid limit states are obtained by multiple reversal shear tests under three shear velocities. From the relationship between residual shear strengths and shear rates, Bingham plastic viscosity and yield stress are estimated. The direct shear tests show that cohesions of fine-grained soil are greater than those of coarse-grained soil at both dry and liquid limit states. However, internal friction angles of fine-grained soil are smaller than those of coarse-grained soil. In case of rheological parameters, the plastic viscosity and yield stress of fine-grained soils are greater than those of coarse-grained soils. This study may be effectively used for the prediction of the reactivated landslide or debris flow after collapse.
Keywords
Cohesion; Direct shear apparatus; Internal friction angle; Residual shear strength; Plastic viscosity; Yield stress;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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