Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

High stress mining under shallow overburden in underground U.S. stone mines.

Authors
Iannacchione-AT; Dolinar-DR; Mucho-TP
Source
1st Int Sem Deep High Stress Min High Stress Min Under Shallow Overburden, November 6-8, 2002, Perth, Australia 2002 Nov :1-11
Link
NIOSHTIC No.
20023444
Abstract
The Chestnut Ridge Anticline is a prominent structure in southwestern Pennsylvania, USA. This structure has brought two economically valuable limestone formations to the surface, where they are easily accessible to room-and-pillar mining. Nine active crushed stone quarries, an underground research facility, and one industrial facility currently operate along the linear trend that represents the axis of the anticline. The National Institute for Occupational Safety and Health (NIOSH) has identified significant variation in levels of horizontal stress within relatively short distances at shallow overburdens along the anticline. At one quarry, the horizontal stress is high enough to shear strata with a modulus of approximately 77 Gpa. Conversely, zones of extension were observed in parts of another quarry, indicating very low horizontal stress conditions. This study found that high levels of horizontal stress are to be expected in this very stiff rock formation and that local geologic and topographic structures are capable of altering the magnitude and possibly the orientation of the horizontal stress field.
Keywords
Mining-industry; Underground-mining; Quarries; Ground-control; Ground-stability; Miners; Risk-factors
Publication Date
20021106
Document Type
Conference/Symposia Proceedings
Fiscal Year
2003
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Priority Area
Disease and Injury: Traumatic Injuries
Source Name
1st International Seminar of Deep and High Stress Mining Under Shallow Overburden
State
PA
TOP