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Impact of orientation of blast initiation on ground vibrations

Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 255-261页

作者： Dayamoy Garai Hemant Agrawal Arvind Kumar Mishra Indian Institute of Technology(ISM) DhanbadIndia Central Mine Planning and Design Institute Limited RanchiIndia

The blast-induced ground vibrations can be significantly controlled by varying the location and orien-tation of point of interest from blast *** blast waves generated due to individual holes get super-imposed and resultant peak particle velocity(PPV)*** the orientation sequence of holes blasts on site,the superimposition angle of wave changes and hence results in significant variation in resultant *** orientation with respect to the initiation of blasts resulting in lowest PPV needs to be identified for any *** knowing the PPV contour of vibration waves in mine sites,it is possible to reduce the vibration on the structures by changing the initiation *** this paper,experimental blasts were conducted at two different mine sites and the PPV values were recorded at different ori-entations from the blast site and its initiation *** PPV contours were drawn to identify the orientation with least and highest PPV generation *** was found that by merely changing the initi-ation sequence of blasts with respect to the sensitive structure or point of interest,the PPV values can be reduced significantly up to 76.9%.

关键词： Peak particle velocity(PPV) initiation orientation Wave superimposition orientation of blast Blast initiation

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Discussion on “Impact of orientation of blast initiation on ground vibrations” [J Rock Mech Geotech Eng 15 (2022) 255e261]

引用

Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 262-268页

作者： Tadeusz Chrzan Poltegor-Instytut Open-pit Mining InstituteWroclawPoland

Recently,Garai et al.(2022)published a paper on the impact of orientation of blast initiation on ground ***,some of the claims are not supported by the results of the given *** Fig.1(see Fig.8 in Garai et al.,2022),there are contours of measured vibration velocities in 4 directions(every 90?)and an incorrect interpretation between *** placing all measured vibration velocity values(Gerai et al.,2022)at well-defined points on a single figure,it was not possible to precisely determine the type of vibration velocity,such as radial,tangential and vertical vibration velocities,with their different *** incorrect conclusion was also drawn about the direction of the highest vibration *** paper by Garai et al.(2022)measured the vibrational velocity of the medium through which the seismic wave passed,but used the incorrect term shock *** shock wave would have destroyed the seismic measuring instruments.A superposition of the vibrational velocity was considered,but not combined with the vibrational frequency of the seismic *** paper presents a method for selecting the time delay between successively initiated explosive charges to the measured frequency of the seismic wave,so that the direction of initiation of the explosive charges does not affect the vibration velocity of the ground through which the seismic wave *** theoretical and measured shapes and waveforms of radial velocity and tangential velocity in an opencast lignite mine are then ***,the conditions for the formation of shock wave,transition wave and seismic waves are presented.

关键词： Peak particle velocity(PPV) initiation orientation Wave superimposition Blast initiation

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