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Mining Publication: A Static Fatigue Constitutive Law for Joints in Weak Rock
Keywords: Numerical modeling Statics Weak rock
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: April 1998
Authors: MK Larson
Conference Paper - April 1998
Download PDF Document (0.45 MB)
NIOSHTIC2 Number: 20000181
In Hans-Peter Rossmanith, ed. Proc Third Intl Conf on Mechanics of Jointed and Faulted Rock, Vienna, Austria; April 6-9, 1998, A.A. Balkema/Rotterdam/Brookfield; :171-177
A constitutive model for rock interfaces based on the principles of static fatigue is proposed. The model is applicable to weak rock or joints with cohesion. Friction and dilation are decreased as plastic work increases. At equilibrium, the creep time increases by one time-step interval, and interface cohesion at each node decreased according to a power function. A constant-load, direct-shear simulation showed that the model is capable of mimicking constant-rate and tertiary creep and predicting failure. Tests on core from a coal mine showed constant-rate and, sometimes, tertiary creep, but also weak transitory creep. The cohesion deterioration function may need modification to simulate primary-phase creep. If model parameters are known for a site, the model can predict the onset of tertiary creep and failure. Such predictions can help engineers make better entry design and support decisions, which will reduce the likelihood of roof falls and increase safety for underground miners.
Image of publication A Static Fatigue Constitutive Law for Joints in Weak RockConference Paper - April 1998
Download PDF Document (0.45 MB)
NIOSHTIC2 Number: 20000181
In Hans-Peter Rossmanith, ed. Proc Third Intl Conf on Mechanics of Jointed and Faulted Rock, Vienna, Austria; April 6-9, 1998, A.A. Balkema/Rotterdam/Brookfield; :171-177
See Also
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Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Determination of In Situ Deformation Modulus for Cemented Rockfill
Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
Numerical Model Calibration for Simulating Coal Pillars, Gob and Overburden Response
Numerical Modeling of Paste Sills in Underhand Cut & Fill Stopes
Pillar Strength and Design Methodology for Stone Mines
Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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