Calculating the cohesion and internal friction angle of volcanic rocks and rock masses

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 expe...

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Autores principales:	Marlène C. Villeneuve, Michael J. Heap
Formato:	article
Lenguaje:	EN
Publicado:	Volcanica 2021
Materias:	mohr-coulomb hoek-brown porosity strength failure criteria Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/c69f2dc57f5d4d3aad460cdee7d78556
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id	oai:doaj.org-article:c69f2dc57f5d4d3aad460cdee7d78556
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spelling	oai:doaj.org-article:c69f2dc57f5d4d3aad460cdee7d785562021-11-23T15:09:07ZCalculating the cohesion and internal friction angle of volcanic rocks and rock masses2610-354010.30909/vol.04.02.279293https://doaj.org/article/c69f2dc57f5d4d3aad460cdee7d785562021-11-01T00:00:00Zhttps://www.jvolcanica.org/ojs/index.php/volcanica/article/view/134https://doaj.org/toc/2610-3540Rock 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.Marlène C. VilleneuveMichael J. HeapVolcanicaarticlemohr-coulombhoek-brownporositystrengthfailure criteriaGeologyQE1-996.5ENVolcanica, Vol 4, Iss 2, Pp 279-293 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mohr-coulomb hoek-brown porosity strength failure criteria Geology QE1-996.5
spellingShingle	mohr-coulomb hoek-brown porosity strength failure criteria Geology QE1-996.5 Marlène C. Villeneuve Michael J. Heap Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
description	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.
format	article
author	Marlène C. Villeneuve Michael J. Heap
author_facet	Marlène C. Villeneuve Michael J. Heap
author_sort	Marlène C. Villeneuve
title	Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
title_short	Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
title_full	Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
title_fullStr	Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
title_full_unstemmed	Calculating the cohesion and internal friction angle of volcanic rocks and rock masses
title_sort	calculating the cohesion and internal friction angle of volcanic rocks and rock masses
publisher	Volcanica
publishDate	2021
url	https://doaj.org/article/c69f2dc57f5d4d3aad460cdee7d78556
work_keys_str_mv	AT marlenecvilleneuve calculatingthecohesionandinternalfrictionangleofvolcanicrocksandrockmasses AT michaeljheap calculatingthecohesionandinternalfrictionangleofvolcanicrocksandrockmasses
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Calculating the cohesion and internal friction angle of volcanic rocks and rock masses

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