Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effects of Grain Size Distribution on the Shear Strength and Rheological Properties of Debris Flow Using Direct Shear Apparatus

직접전단장비를 이용한 토석류의 전단강도 및 유변학적 특성에 대한 입도분포의 영향 연구

  • 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.)
  • 박근우 (고려대학교 건축사회환경공학화) ;
  • 홍원택 (고려대학교 건축사회환경공학화) ;
  • 홍영호 (고려대학교 건축사회환경공학화) ;
  • 정승원 (한국지질자원연구원 지질환경재해연구센터) ;
  • 이종섭 (고려대학교 건축사회환경공학화)
  • Received : 2017.08.08
  • Accepted : 2017.11.27
  • Published : 2017.12.31
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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.

본 연구에서는 전단특성 및 유변학적 정수를 모두 산정할 수 있는 직접전단실험 장비를 이용하여 조립토와 세립토에 대하여 전단강도 및 유변학적 특성에 대한 입도분포의 영향을 조사하고자 하였다. 최대입경 0.075mm의 세립토와 최대입경이 0.425mm이고, 세립분 함량이 17%인 조립토를 건조상태와 액성한계상태로 조성하여, 산사태 분류기준에 따라 재활성 산사태(reactivated landslide) 혹은 붕괴직후 토석류 속도에 해당하는 전단속도에 대하여 전단강도를 산정하였다. 또한, 유변학적 특성 평가를 위해 액성한계상태로 조성된 조립토와 세립토에 대하여 서로 다른 세 가지의 전단변형률속도로 반복적으로 전단하며 잔류전단강도를 측정하였다. 측정된 잔류전단강도와 전단변형률속도와의 관계를 통해 빙햄모델의 소성 점도와 항복응력을 산정하였다. 건조 및 액성한계상태에서 조성된 시료에 대하여 첨두전단강도에서 산정한 점착력의 경우, 세립토에서 조립토보다 더 크게 산정되었으며, 내부마찰각은 조립토에서 더 크게 산정되었다. 유변학 정수의 경우, 소성 점도와 항복응력이 조립토보다 세립토에서 더 큰 것으로 나타났다. 본 연구는 재활성 산사태 혹은 붕괴직후 토석류의 거동예측에 효과적으로 활용될 것으로 기대된다.

Keywords

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