A SHEAR TEST OF DEBRIS ROCK AT LABORATORY SCALE

Authors

  • Saviqri Suryaputra Institut Teknologi Bandung Kementerian ESDM
  • Made Astawa Rai Institut Teknologi Bandung (ITB)
  • Nuhindro Priagung Widodo Institut Teknologi Bandung
  • Bob Andrea Lingga Mining Engineering, Institut Teknologi Bandung

DOI:

https://doi.org/10.30556/imj.Vol23.No1.2020.1090

Keywords:

Barton and Kjaernsli criterion, debris rock shear strength, equivalent roughness, mudstone, shear strength test

Abstract

As one of rock’s mechanical properties, the shear strength is one of the most significant factors that affect rock-dump slope stability. On previous research, one of the tests that needs to be conducted for shear strength characteristic estimation is the field-scale tilt test that requires a lot of expense and material. In this research, a direct shear test was conducted to 3 different mudstone specimens for modeling the Barton and Kjaernsli shear strength at laboratory-scale, using the fragment size of coarse (50 mm - 1 mm), medium (<1 mm – 0.25 mm), and fine (<0.25mm). Then, the results was compared to the shear strength of the debris rock that was come from the value of the equivalent roughness (R) both derived from back-calculated and empirical calculation. This research delivers the estimated shear strength that is more representative because the specimens were controllable in regards to its fragment size and composition. The more predominant big rock fragment in a composition, the bigger its back-calculated R-value. The obtained crushed rock shear strength with empirical R was lower in value compared to the one with back-calculated R.

Author Biographies

Saviqri Suryaputra, Institut Teknologi Bandung Kementerian ESDM

Mine Inspector, Ministry of Energy and Mineral Resources RI

Made Astawa Rai, Institut Teknologi Bandung (ITB)

Rock Mechanic Professor, Mining Engineering, Institut Teknologi Bandung

Nuhindro Priagung Widodo, Institut Teknologi Bandung

Rock Mechanic Lecturer, Mining Engineering, Institut Teknologi Bandung

Bob Andrea Lingga, Mining Engineering, Institut Teknologi Bandung

Master's Degree of Rock Mechanic

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Published

2020-04-30