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A distinct element parametric study of collapse and support of an underground opening in rock masses of varying quality.

Authors
MacLaughlin-MM; Brady-TM; Pakalnis-R
Source
40th Symposium on Engineering Geology and Geotechnical Engineering, Logan, Utah, USA, May 24-26, 2006. Pocatello, ID: Idaho State University, 2006 May; :176-187
NIOSHTIC No.
20041769
Abstract
This project involved modeling rock masses with varying Rock Mass Rating (RMR) values to determine the degree of instability that develops around an underground opening as a function of RMR. The two-dimensional modeling was performed using Itasca's UDEC distinct element software, which allows explicit modeling of blocks of rock and how they interact with each other. The analyses included three different orientations of the joint sets, four different joint spacings, three different values of joint strength and two different values of block comer rounding, which combine for a total of 72 different combinations of model parameters. Two different modes of behavior were observed: local failure of area immediately surrounding the roof and sides of the opening, and deep-seated failure extending a large distance beyond the opening. Quantification of the size of the unstable area that developed provides numerical validation of empirical guidelines used in design of ground support and instrumented monitoring systems.
Keywords
Underground-mining; Safety-research; Injuries; Mining-industry; Hazards; Longwall-mining; Rock-falls; Coal-miners; Miners; Mine-workers; Underground-miners; Geology; Geophysics; Ground-control
Publication Date
20060625
Document Type
Conference/Symposia Proceedings
Fiscal Year
2006
NTIS Accession No.
NTIS Price
NIOSH Division
SRL
Source Name
40th Symposium on Engineering Geology and Geotechnical Engineering, Logan, Utah, USA, May 24-26, 2006
State
WA; MT; ID; UT
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