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High-speed Photography Studies of Laboratory Cratering in Tennessee Marble Plates.

Authors
Condon-JL; D'andrea-DV
Source
NTIS: PB 209 010 :18 pages
Link
NIOSHTIC No.
10008850
Abstract
High-speed movies were taken of crater experiments in two- dimensional plates of Tennessee marble to study craters being formed primarily by stress-wave action. The contribution of gas action to the cratering process was minimized because the two-dimensional models did not contain the expanding gases from the explosive. Four burdens were studied for solid plates and one burden for a segmented plate. After cratering, the plates were reassembled for dye penetrant studies of the fracturing. Flyrock velocities were calculated and related to the degree of fracturing, and compared with those from quarry shots. In general, the smallest burdens produced the highest flyrock velocities and the least amount of fracturing. Flyrock velocities compared favorably with initial flyrock velocities in quarry blasts, but did not show step accelerations owing to gas effects as did the quarry blasts. The test with a segmented plate was used to simulate cratering in a jointed material and showed that stress-wave effects can be important for crater formation in jointed rocks.
Publication Date
19720101
Document Type
IH; Report of Investigation;
Fiscal Year
1972
NTIS Accession No.
PB-209010
NTIS Price
A03
Identifying No.
RI 7613
Source Name
NTIS: PB 209 010
State
TN;
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