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High resolution seismic refraction tomography for determining depth of blast induced damage in a mine wall.

Authors
Singer-JA; Link-CA; Iverson-SR
Source
Blasting Fragm 2009 Aug; 3(2):115-140
Link
NIOSHTIC No.
20036019
Abstract
High resolution seismic refraction tomography has proved to be a useful tool to effectively estimate depth of blast induced damage in a mine face. Excavation blast damage can be as shallow as 1 to 2m and requires resolution at a fraction of a meter for effective imaging. We used an accelerometer with flat frequency response to 1000Hz to record data at spacings of approximately 0.25 to 0.5m along mine walls. First arrival times from the seismic data were used to produce P-wave velocity tomograms. The tomograms show transition from low velocity zones to velocity associated with competent rock. We interpret the low velocity zones to indicate residual fracturing from blasting. Experiments on a concrete test block and at two underground mine locations give results that are consistent with fractured rock transitioning to competent rock. Our method can be applied efficiently in an underground environment to provide continuous velocity information with depth into a mine wall over a span of approximately 10m.
Keywords
Mining-industry; Underground-mining; Author Keywords: seismic; refraction; tomography; fractures; blast damage
Contact
C. A. Link, Montana Tech, 1300 West Park St., Butte, MT, 59701
Publication Date
20090801
Document Type
Journal Article; Trade
Email Address
clink@mtech.edu
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Contract-212-2006-M-18282
Issue of Publication
2
ISSN
1937-6359
NIOSH Division
SRL
Priority Area
Mining
Source Name
Blasting and Fragmentation
State
WA
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