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Stress measurement of a jointed rock mass during drift development.

Authors
Johnson-J; Larson-M; Brady-T; Whyatt-JK; Langston-RB; Kirsten-H
Source
Proceedings of the 2nd Southern African Rock Engineering Symposium. Implementing Rock Engineering Knowledge Johannesburg, S. Africa, September 13-15, 1999. Portugal: International Society of Rock Mechanics, Sep 1999; :94-101
Link
NIOSHTIC No.
20028186
Abstract
An experiment is described in which hollow inclusion cells (HICells) were used to measure stress in a jointed rock mass during drift development at the Stillwater Mine, Nye, MT, USA. Two HICells were installed in the footwall approximately two drift widths ahead of the face. One HICell was overcored and then immediately tested in a biaxial chamber. The other HICell was left in place and monitored as the drift was excavated in three advances, each one-half the width of the drift. Strains were recorded hourly by a datalogger. Results show that there was little stress change during the first and second drift advances, but that a large stress change occurred after the third advance. The measurements also showed that the in situ principal stress directions lined up with regional geologic structures. Stress changes during face advance were likely caused by deformation along localized joint sets and inelastic deformation near the face.
Keywords
Mine-shafts; Mine-workers; Mining-industry; Miners; Traumatic-injuries; Injury-prevention; Injuries; Structural-analysis; Rock-mechanics
Publication Date
19990901
Document Type
Conference/Symposia Proceedings
Editors
Hagan-TO
Fiscal Year
1999
NTIS Accession No.
NTIS Price
NIOSH Division
SRL
Source Name
Proceedings of the 2nd Southern African Rock Engineering Symposium. Implementing Rock Engineering Knowledge Johannesburg, S. Africa, September 13-15, 1999
State
WA; MT
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