Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
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In: Volcanica, Vol. 4, No. 2, 23.11.2021, p. 279-293.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
AU - Villeneuve, Marlene
AU - Heap, M. J.
N1 - Publisher Copyright: © 2021 Volcanica. All rights reserved.
PY - 2021/11/23
Y1 - 2021/11/23
N2 - Rock failure criteria are key input parameters for models designed to better understand the stability of volcanic rock masses. Cohesion and friction angle are the two defining material variables for the Mohr-Coulomb failure criterion. Although these can be determined from laboratory deformation experiments, they are rarely reported. Tabulated data for volcanic rocks, calculated using published triaxial results, show that cohesion and friction angle decrease with increasing porosity. If porosity is known, these empirical fits can provide laboratory-scale cohesion and friction angle estimations. We present a method to upscale these parameters using the generalised Hoek-Brown failure criterion, discuss the considerations and assumptions associated with the upscaling, and provide recommendations for potential end-users. A spreadsheet is provided so that modellers can (1) estimate cohesion and friction angle and (2) upscale these values for use in large-scale volcano modelling. Better constrained input parameters will increase the accuracy of large-scale volcano stability models.
AB - Rock failure criteria are key input parameters for models designed to better understand the stability of volcanic rock masses. Cohesion and friction angle are the two defining material variables for the Mohr-Coulomb failure criterion. Although these can be determined from laboratory deformation experiments, they are rarely reported. Tabulated data for volcanic rocks, calculated using published triaxial results, show that cohesion and friction angle decrease with increasing porosity. If porosity is known, these empirical fits can provide laboratory-scale cohesion and friction angle estimations. We present a method to upscale these parameters using the generalised Hoek-Brown failure criterion, discuss the considerations and assumptions associated with the upscaling, and provide recommendations for potential end-users. A spreadsheet is provided so that modellers can (1) estimate cohesion and friction angle and (2) upscale these values for use in large-scale volcano modelling. Better constrained input parameters will increase the accuracy of large-scale volcano stability models.
KW - Mohr-Coulomb
KW - Hoek-Brown
KW - Strength Failure Criteria
KW - Porosity
KW - Failure Criteria
KW - Strength
UR - http://www.scopus.com/inward/record.url?scp=85120752287&partnerID=8YFLogxK
U2 - 10.30909/vol.04.02.279293
DO - 10.30909/vol.04.02.279293
M3 - Article
VL - 4
SP - 279
EP - 293
JO - Volcanica
JF - Volcanica
SN - 2610-3540
IS - 2
ER -