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Shear origin of tension in excavation-induced fractures.

Authors
White-BG; Iverson-S; Larson-M
Source
Soil and Rock America 2003. 12th Panamerican Conference on Soil Mechanics and Geotechnical Engineering and the 39th U.S. Rock Mechanics Symposium, Vol. 1. Cambridge, MA: Massachusetts Institute of Technology, 2003 Jun; 1:909-916
Link
NIOSHTIC No.
20024130
Abstract
The authors hypothesize that excavation-induced extension fractures are caused by elastic shearing displacement that in turn causes tension oblique to a propagating shear zone. Such extension is manifested as tension on scales larger than that of microcracks. En echelon fracture patterns are a common result. FLAC modeling confirmed that localized tension is created near the corners of mine openings. In the model, tension was concentrated at the leading edge of a simulated fracture in a pattern that could promote the formation of an en echelon fracture. Particle Flow Code models confirm progressive formation of en echelon tensile failures with distance from an opening. The elastic displacements and the resulting fractures facilitate reduction in applied load at the expense of shear deformation and lateral dilation. Understanding the mechanics of fracture and deformation is vital for designing more effective ground support practices, a major objective of ground control research being conducted at the Spokane Research Laboratory of the National Institute for Occupational Safety and Health.
Keywords
Ground-stability; Ground-control; Occupational-hazards; Hazards; Injuries; Geology
Publication Date
20030622
Document Type
Conference/Symposia Proceedings
Editors
Culligan-PJ; Einstein-HH; Whittle-AJ
Fiscal Year
2003
NTIS Accession No.
NTIS Price
NIOSH Division
SRL
Source Name
Soil and Rock America 2003. 39th U.S. Rock Mechanics Symposium
State
WA
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