Controlled Fracture Growth by Blasting While Protecting Damages to Remaining Rock

Rathore, S. S.; Bhandari, S.

doi:10.1007/s00603-005-0080-5

Cited by 37 publications

(12 citation statements)

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“…In order to control blast damage, it is required that the blasting process produces the macro-cracks between the contour holes and eliminates micro-cracks in the remaining rock. 1 A question was often raised whether the cracks are first generated around or between the contour holes. In order to answer this question, small scale blasting experiments were conducted on concrete samples.…”

Section: What Is Blast Damage?mentioning

confidence: 99%

Over break control in underground mines

Singh¹

2018

MOJCE

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Blasting is an integral part of hard rock mining and remains the most cost effective method of hard rock fragmentation. However, the costs associated with blast damage in terms of safety and productivity of mines are becoming a serious concern. In order to understand the mysterious nature of blast damage prediction and control, field work involved the small scale blasting of physical models and monitoring of blasts in operating hard rock mines. Understanding the factors affecting blast damage is an important step for blast damage control and the refinement of blasting practice and design for damage minimization. Small scale blasting and the monitoring of field blasting practice provided a better understanding of the performance of the blasts in general and identified which aspects of blasting had a significant impact upon over break control. In the light of the field work, following aspects have been discussed to minimize over break in underground excavations. a. Drilling and blasting practice b. Explosive characteristics and distribution c. Explosive products for perimeter control d. Blast design e. Relevance of rock mass characterization to blasting results In addition, based upon the review of the case histories and work done by the author at different sites, a criterion for minor and major blast damage has been proposed.

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Section: What Is Blast Damage?mentioning

confidence: 99%

Over break control in underground mines

Singh¹

2018

MOJCE

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“…Zheng et al [16] optimized the periphery borehole charge and charge structure to improve the efficiency of traditional cutting blasting. Rathore and Bhandari [17] adopted different types of liner notching inside the borehole to determine the rock damage and studied the damage quantification in single circular and notched holes. This method is mainly used in presplitting or smooth blasting and is difficult to apply in engineering blasting because of the complex drilling process.…”

Section: Shock and Vibrationmentioning

confidence: 99%

Experimental Study of Bilinear Initiating System Based on Hard Rock Pile Blasting

Miao

Yan

et al. 2017

Shock and Vibration

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It is difficult to use industrial explosives to excavate hard rock and achieve suitable blasting effect due to the low energy utilization rate resulting in large rocks and short blasting footage. Thus, improving the utilization ratio of the explosive energy is important. In this study, a novel bilinear initiation system based on hard rock blasting was proposed to improve the blasting effects. Furthermore, on the basis of the detonation wave collision theory, frontal collision, oblique reflection, and Mach reflection during detonation wave propagation were studied. The results show that the maximum detonation pressure at the Mach reflection point where the incident angle is 46.9 ∘ is three times larger than the value of the explosive complete detonation. Then, in order to analyze the crack propagation in different initiation forms, a rock fracture test slot was designed, and the results show that bilinear initiating system can change the energy distribution of explosives. Finally, field experiment was implemented at the hard rock pile blasting engineering, and experimental results show that the present system possesses high explosive energy utilization ratio and low rock fragments size. The results of this study can be used to improve the efficiency in hard rock blasting.

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“…A major discontinuity such as a fault can arrest the fractures and as a result, fracture plane cannot fully form, which will result in incomplete presplitting blast. Rathore and Bhandari studied some effective parameters on fracture growth by blasting such as variation of explosive energy, variation of stemming, blasthole liners and so on [17]. Their result showed the variations of extent and direction of fractures with variation of mentioned parameters.…”

Section: Introductionmentioning

confidence: 97%