PPV Management and Frequency Shifting in Soft Ground Near Highwalls to Reduce Blast Damage
In order to manage blast vibration in soft ground containing large diameter holes and large charge weights, a number of issues must be considered. This paper describes techniques to control and reduce near-field blast vibrations absorbed by highwalls in soft ground. Sympathetic detonations need to be controlled. Sympathetic detonations can cause excessive vibration due to an unknown number of charge weights firing out of sequence. The excessive vibration can cause damage to the ground. Sympathetic detonations can be controlled through proper design of blast patterns and, in some cases, through the use of specialized electronic detonators. Once sympathetic detonations are eliminated, blast vibrations can be managed through the design of individual charge weights, blast timing, initiation location, and other measures. With an advanced blast vibration model blast design parameters can be selected and vibration amplitudes and frequencies predicted. In particular, this paper presents the principle and exampies of frequency shifting with application of vibration modeling using a newly developed blast vibration model suitable for both near and far field vibrations. The degree of success in applying these integrated techniques has been validated with field measurements.
soft ground sympathetic detonation vibration management frequency shifting blast vibration modeling
Ruilin Yang Tamara Whitaker Shawn Kirkpatrick
Orica USA Inc 33101 E Quincy Ave Watkins, CO 80015, USA
国际会议
The Second Asian-Pacific Symposium on Blasting Techniques(第二届亚太地区爆破技术研讨会)
大连
英文
72-83
2009-07-01（万方平台首次上网日期，不代表论文的发表时间）