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Proceedings Paper

An Investigation On The Blasting Strain Fields Between The Adjacent Bopeholes With Dynamic Moire-Photoelasticity And Strain Gages
Author(s): Zhu Zhenhai; Sun Yanjun
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Paper Abstract

The blasting strain fields between the adjacent boreholes initiated simultaneously were investigated with the dynamic moire-photoelasticity and the strain gages. A multiple spark dynamic photoelastic apparatus (Mode WZDD-1) and the super-dynamic. measuring system were utilized in the dynamic recording. According to the dynamic moire-photoelastic fringe patterns, the superposition of blasting stress waves was analysed, and the distribution of az(in the direction of the line linking two adjacent borehole centers, which is simply called linking-center line in the following) and ar (in the direction which is normal to the linking-center line) in the linking-center line and ea. in the line which is vertical to the linking-center line through the middel point of the linking-center line were calculated quantitatively. The oscillations of strain vs. time in the linking-center line due to the superposition of blasting stress waves were recorded with the foil strain gages. The laws of superposition and attenuation of stress waves between boreholes derived from the measured and calculated results are in agreement with the results from the theoretical analyses.

Paper Details

Date Published: 1 January 1987
PDF: 7 pages
Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967416
Show Author Affiliations
Zhu Zhenhai, Beijing Graduate School (China)
Sun Yanjun, Northern Jiaotong University (China)

Published in SPIE Proceedings Vol. 0817:
Optomechanical Systems Engineering
Daniel Vukobratovich, Editor(s)

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