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Practical estimation of rock properties for modeling bedded coal mine strata using the Coal Mine Roof Rating.

Authors
Esterhuizen-GS; Bajpayee-TS; Ellenberger-JL; Murphy-MM
Source
47th US Rock Mechanics/Geomechanics Symposium, June 23-26, 2013, San Francisco, California. Alexandria, VA: American Rock Mechanics Association, paper no. ARMA-2013-154, 2013 Jun; 3:1634-1647
NIOSHTIC No.
20043708
Abstract
Numerical models are increasingly used as tools to design support for coal mine entries. A critical part of the design process is to obtain rock strength parameters that are representative of the large-scale rock mass surrounding the excavations. The Coal Mine Roof Rating (CMRR) is a rock classification system that was developed to characterize the bedded strata found in coal mines. Procedures were developed to estimate rock strength properties suitable for numerical modeling based on the CMRR outputs. The rock matrix and bedding strength are quantified separately for the different rock units. The rock units are modeled using the ubiquitous joint approach, accounting for laboratory- to field-scale strength reduction. Contacts between units are modeled as explicit interfaces. Procedures for estimating the bedding cohesion, tensile strength and friction angle from CMRR data are presented. The strength estimation and modeling procedures are calibrated against several field monitoring sites to ensure that realistic results are obtained. Two cases are presented to demonstrate the approach and the match with field monitoring results.
Keywords
Mining-industry; Coal-mining; Rock-mechanics; Structural-analysis; Ground-control; Ground-stability; Mathematical-models; Analytical-models; Geology; Geophysics; Models; Tensile-strength; Mechanical-properties; Mechanical-properties-testing; Testing-equipment; Equipment-design; Environmental-control-equipment
Contact
G. S. Esterhuizen, Office of Mine Safety and Health Research, National Institute for Occupational Safety and Health, Pittsburgh, PA, USA
Publication Date
20130623
Document Type
Conference/Symposia Proceedings
Fiscal Year
2013
NTIS Accession No.
NTIS Price
ISBN No.
9781629931180
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
47th US Rock Mechanics/Geomechanics Symposium, June 23-26, 2013, San Francisco, California
State
PA; CA
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