Prediction and Control of Fragmentation from Electronic Detonator Blasting
In order to investigate the effect of electronic delay detonator interval to obtain smaller fragment size, full scale benchblasting and size distribution measurement was conducted at a sandstone quarry. The height of the bench was about 10m. Influences on the size distribution of a blasting condition and a rock quality condition differences between every blast were tried to eliminate according to Kuz-Ram fragmentation size prediction equation. Real geometry of blasting such as burden and spacing were measured by a laser profiler and a borehole tracer. A distribution of Joint on a face was analyzed by image processing and a mean joint interval was obtained. Good relationship between a mean fragmentation size and a mean joint interval was observed and this value was utilized to improve the prediction accuracy of Kuz-Ram equation. Rock quality constant A was calculated as a function of this mean joint interval.The delay time accuracy of the electronic detonator was 100 microsecond for settled initiation time. Delay tone interval of 0, 1, 2, 5 and 10ms were tried. These are equivalent to 0, 0.4, 0.7, 1.7, 3.6ms per 1m of spacing, respectively.By introducing a mean joint interval for Kuz-Ram equation, the prediction accuracy was improved well. Finest fragmentation size was achieved in case of 5ms of delay time interval, equivalent to 1.7ms per 1m of spacing.
kuznetsov cunningham joint electronic detonator delay interval
Masaaki Yamamoto Masaaki Nishi Tsuyoshi Murashita Hidehiro Noda
Asahi KASEI Chemicals Corporation , Sumida, Tokyo, Japan Asahi KASEI Geotechnohgtes Co., Ltd., Sumida, Tokyo, Japan
国际会议
The Asian-Pacific Symposium on Blasting Techniques(亚洲太平洋地区爆破技术研讨会)
昆明
英文
127-131
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）