含缺陷PMMA介质的定向断裂控制爆破试验研究

doi:10.13722/j.cnki.jrme.2016.0334

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Abstract The crack flaws and empty hole flaws were set in a single experiment using the experimental material of PMMA and the new system of digital laser dynamic caustics so that the effects of flaws on the crack propagation in the controlled directional fracture blasting were studied. The results show that the forms of flaws have little effect on the length of blasting induced main cracks. The propagation of main cracks have two stages. In stage I(0–120 μs)，the propagation velocity and stress intensity factor at crack tip decrease rapidly. In stage II(120 μs–crack arrest)，the effects on crack tips caused by stress wave reflected from flaws are more significant，the energy accumulation and stress concentration of crack tips are enhanced，and the velocity and dynamic stress intensity factor increase to a great extent. The peak velocity and peak dynamic stress intensity factor of blasting induced main crack decrease gradually with the curvature increasing of flaw sides during the stage II.

Key words： blasting engineering directional fracture controlled blasting blasting induced main crack dynamic stress intensity factor

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	Articles by authors
	YANG Renshu1
	2
	DING Chenxi1
	YANG Liyun1
	WANG Yanbing1
	XU Peng1

Cite this article:

YANG Renshu1,2,DING Chenxi1, et al. Experimental study on controlled directional fracture blasting#br# on PMMA mediums with flaws[J]. , 2017, 36(3): 690-696.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.0334 OR http://www.rockmech.org/EN/Y2017/V36/I3/690

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