Details:

Personal Author:
Esterhuizen, G. S. ; Dolinar, D. R. ; Iannacchione, A. T.
Esterhuizen, G. S. ; Dolinar, D. R. ; Iannacchione, A. T. Less -
Corporate Authors:
National Institute for Occupational Safety and Health.
Conference Authors:
International Symposium on Ground Support in Mining and Civil Engineering Construction (6th : 2008 March 30-April 3 : Cape Town, Republic of South Africa)
Description:
Limestone formations in the United States can be subject to relatively high horizontal stresses due to the existence of tectonic loading of the limestone strata. Underground limestone mines use the room-and-pillar method, in which 12- to 18-m-wide rooms are typically excavated. The stability of these excavations can be compromised by the horizontal stress, resulting in a rockfall hazard. Rockfalls are the cause of 15% of all reportable injuries in underground limestone mines. Horizontal stress related damage can occur in the form of guttering along one or more sides of an excavation, roof beam buckling or oval shaped roof falls, with the long axis perpendicular to the major horizontal stress. Numerical analyses show that the pillar layout and orientation of the mine workings have an effect on the horizontal stress distribution within the roof. The effects of high horizontal stresses can be mitigated by orientating the heading development direction parallel to the maximum horizontal stress, reducing the number of cross-cuts and offsetting the cross-cuts to limit the potential lateral extent of horizontal stress related roof falls. The modeling approach described in this paper can be used as a tool to evaluate potential roof failure and optimize the stability of room and pillar layouts.
Subject:
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Mining
Source:
Proceedings of the 6th International Symposium on Ground Support in Mining and Civil Engineering Construction, Cape Town, Republic of South Africa, March 30-April 3, 2008. Johannesburg, Republic of South Africa: The South African Institute of Mining andMetallurgy, 2008 Mar; :103-118
Document Type:
Book Chapter
Genre:
Conference Publications
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:d52737082a01634c759b47c8ec6b7c26028bbc6da27b9ca62d0e52108fe45f77
Download URL:
https://stacks.cdc.gov/view/cdc/9895/cdc_9895_DS1.pdf
File Type:

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