Exploration into the causes of uncertainty in UDEC grain boundary models

Author(s): 
John Mayer, D Stead
Date: 
Saturday, October 15, 2016
First presented: 
Computers and Geotechnics
Type: 
Published paper
Category: 
Geology

Considerable research has recently been undertaken to investigate the simulation of brittle fracture mechanisms using distinct element grain boundary models. However, to date, few studies have addressed the limitations of these models when used for predictive analysis. Our research suggests that mesh geometry dependencies can impart irreducible uncertainties into the method despite apparent calibration. In addition, Voronoi meshing routines can limit the kinematic freedom, and increase the degree of interlocking and localized tensile failure; whereas, more recently introduced triangular mesh geometries can have an opposite effect, increasing kinematic freedom, and predisposing models toward shear failure mechanisms.

Full paper available at ScienceDirect (Computers and Geotechnics, Vol. 82, Feb. 2017, Pages 110-123).


Feature Author:    
John Mayer

Hydrogeologist
MSc, BSc
jmayer@srk.com

SRK Vancouver

John Mayer is a Hydrogeologist with a specialization in physical hydrogeology and engineering geology of fractured rock systems. He obtained a Bachelor of Science (Honours) degree in earth science from Simon Fraser University, completing a B.Sc. thesis in fractured-rock hydrogeology, and a Master of Science degree in engineering geology from Simon Fraser University, where he focused on uncertainty characterization in numerical rock mechanic analysis. At SRK, John has participated in mining related groundwater investigations for both underground and open pit operations.

 

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