Blast vibration effects in an underground mine caused by open-pit mining

Singh, Pradeep K.; Roy, Moumita; Paswan, Ranjit Kumar; Dubey, Rajesh Kumar; Drebenstedt, Carsten

doi:10.1016/j.ijrmms.2015.09.009

Cited by 61 publications

(23 citation statements)

References 9 publications

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“…Stewart and Truman [1] studied the effect of hydraulic radius and stability number on the dilution. Singh et al [19] studied the effects of vibration resulting from the blasting of an open pit mine on the damage caused to the underground metal mine. Jha and Deb [20] investigated the effects of vibration resulting from the blasting of an open pit mine on damage caused to an underground coal mine adjacent to the mine.…”

Section: Introductionmentioning

confidence: 99%

Effects of Blast Vibration on Unplanned Dilution in an Underground Metal Mine

Mohseni

Ataei

Khalookakaie

2019

anm

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One of the factors affecting overbreak or slough of the roof and walls of underground stopes, causing unplanned dilution is blast vibration. The amount of damage caused by earth vibration can be measured in terms of peak particle velocity (PPV). In this study, in order to investigate the effects of blast vibration on the occurrence of unplanned dilution, 72 three-component records acquired upon 24 blasts were obtained at underground Venarch Manganese Mines. Once finished with data analysis, scale distance was used to propose an exponential equation for predicting PPV based on the cubic root of the charge weight per delay. Then, the effect of blast vibration on walls and roof of the stope was examined on 24 different explosions, dilution values were recorded at various scaled distances to the face, and the relationship between them was determined. Equivalent linear overbreak/slough (ELOS) was used to determine dilution, with cavity monitoring system (CMS) being used to calculate it. Then a practical diagram was presented to predict the boundary of the dilution area from the explosion. Finally, The relationship between the amount of ELOS against the PPV was presented and it was determined if the PPV was fewer than or equal to 6.73 mm / s, the dilution will not occur.

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Section: Introductionmentioning

confidence: 99%

Effects of Blast Vibration on Unplanned Dilution in an Underground Metal Mine

Mohseni

Ataei

Khalookakaie

2019

anm

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“…ese discontinuous structures, such as faults, joints, fissures, and fractured zones, are randomly distributed in the rock mass and have important implications for blasting engineering. In blasting operations, natural cracks in the rock mass structure are changed by additional stresses induced by the blasting, and the shear strength of the structural surface is significantly reduced, thereby decreasing the stability of the rock [1,2]. Studies on blast vibration harm control are conducted based on analysis of blast vibrations.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Blasting‐Induced Ground Vibration in an Open‐Pit Mine under Different Rock Properties

Yin

Wei

et al. 2018

Advances in Civil Engineering

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In an open-pit mine slope, rock mass has multiple joint structures and blasting operations have an obvious influence on its stability. Therefore, accurately predicting the blasting vibration is necessary to ensure slope stability. In this study, the blasting vibration signals monitored at a blasting site with different rock masses were used to investigate the attenuation characteristics of blasting vibration through the peak particle velocity (PPV), frequency characteristics, and energy distribution of the blasting vibration signals analyzed with the time-frequency processing method. The results demonstrated that the main vibration frequency of the blasting vibration of dolomite was wider than that of shale, and these main vibration frequencies occurred at 25 kHz and 14 kHz for dolomite and shale, respectively, at a distance of 50 m from the blast area to the vibration monitoring point. With an increase in the distance from 50 m to 200 m, the main vibration frequencies decreased to less than 5 Hz. With increasing joint degree, the attenuation rate of the vibration velocity and energy attenuation of the blasting vibration increase, indicating that the structural parameters of the rock mass (such as the number of joints) have a significant impact on the attenuation law of blasting vibration. Furthermore, a modified equation that can be used for predicting PPV was developed by considering the effect of the number of joints in the rock mass on the blasting vibration. For the same ground vibration readings, the correlation factor increased from 0.8 to 0.85 for the Nicholls-USBM equation and the modified equation, respectively. The PPV of blasting under different rock masses of the Baideng open-pit phosphorite mine was used to verify the modified equation. The results show that a modified equation can be used for predicting the PPV of blasting engineering in the Baideng phosphorite mine and that the prediction accuracy is acceptable.

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“…In industrial practice as well as in researches, the Power form of the expression with 'n' as 0.5 has been preferred for the attenuation relationship for underground blasts, viz. Istanbul Kadıköy-Kartal metro tunnel [12,13]; for dredging operation in Mumbai Port Trust and the safety of the Elephanta Caves [14]; a 85 year old masonry dam and fresh concrete structures [1]; and underground mine blasting [10,15]. Application of soft computing techniques like artificial neural network (ANN) had been reported for estimation and prediction of PPV for underground blasts.…”

Section: Introductionmentioning

confidence: 99%

New Approach for Identification of Suitable Vibration Attenuation Relationship for Underground Blasts

Dauji¹

2018

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For construction and mining activities, excavation is often performed with the help of blasting in hard or weathered rock or even hard soil. As a safety practice, the blasting operation is designed so that the nearby structures are not adversely affected. For this, blast vibration attenuation relationship for the ground media becomes necessary. In India, the relevant IS code specifies an attenuation relationship (Power expression) between the peak particle velocity, the charge weight and the distance of the monitoring point from the blast. However, the empirical coefficients are provided in IS code for only two categories-hard rock and weathered rock / soil. Hence they result in uneconomical and sometimes unviable blasting design. In lieu of above, site specific attenuation relationship may be used for design of blasting operation. Industrial practice is to find the empirical constants for the same Power expression (as IS code) using trial blast data from the site. For this purpose, the same dataset is used for parameter estimation as well as evaluation of the suitability of the estimated parameters. In this study it is demonstrated that evaluation of performance with a different dataset alters the conclusions. Further, expressions other than the commonly adopted Power expression might be more suitable for the relationship. In this article, two other expressions, namely, Reciprocal expression and Weibull model were identified which could be equally good. Exponents for scaled distance calculation, other than the popularly adopted 0.5, were found to be applicable in the case study. Trail blast data from a site was used to demonstrate the same. It was concluded that while developing site specific attenuation relationship, various expressions with different exponents should be examined for their suitability. The available dataset should be split into parameter estimation set and performance evaluation set. The best expression identified for the site from the performance evaluation set should be finally adopted for further activities.

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Blast vibration effects in an underground mine caused by open-pit mining

Cited by 61 publications

References 9 publications

Effects of Blast Vibration on Unplanned Dilution in an Underground Metal Mine

Effects of Blast Vibration on Unplanned Dilution in an Underground Metal Mine

Assessment of Blasting‐Induced Ground Vibration in an Open‐Pit Mine under Different Rock Properties

New Approach for Identification of Suitable Vibration Attenuation Relationship for Underground Blasts

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