Experimental study on the effects of joints on blasting induced cracks propagation

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (10) : 26-30.

YANG Ren-shu1,2，DING Chen-xi1，YANG Li-yun1，WANG Yanbing1，XU Peng1

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Abstract

Using model test method combined with new digital laser dynamic caustics experimental system(DLDC), the dynamic behaviors of crack initiation at joints were compared in condition of different intervals between boreholes and joints, the effects of joints on blasting induced cracks propagation were studied. It showed that the failure forms of test specimens were various duo to mesoscopic differences of joint structure. There were two forms of crack initiation at joints according to different crack initiation time situations, Form 1: Crack at the joint did not initiate until the blasting induced crack reaching to the joint; in this form, the direct action of blasting induced cracks on joints was primary cause of crack initiation at joints, the offset distance of crack which initiated at the joint had little to do with the distance between borehole and joint in such form. Form 2: Crack at the joint had already initiated and propagated before the blasting induced crack reaching to the joint; in this form, the action of blasting stress waves on joints was primary cause. The overall scope of crack offset distance at the joint was determined by these two forms. Different failures of specimens showed various discrepancies and complexities in the aspect of crack stress characteristics.

Key words

Model test / dynamic caustics / blasting induced crack / joint / crack initiation / stress characteristics

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YANG Ren-shu1,2，DING Chen-xi1，YANG Li-yun1，WANG Yanbing1，XU Peng1. Experimental study on the effects of joints on blasting induced cracks propagation[J]. Journal of Vibration and Shock, 2017, 36(10): 26-30

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