ULTRASONIC CONVERGENCE MEASUREMENTS.

被引：0
|
作者：
McVey, James R.
机构：
来源：
Report of Investigations - United States, Bureau of Mines | 1984年
关键词：
ULTRASONIC TRANSDUCERS - Applications;
D O I：
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学科分类号：
摘要：
Tests during pillar robbing, longwall operations, and other mining activities indicate that roof-floor convergence rates can be used as an indicator of imminent roof failure. New instruments provide nonobstructing measurements up to 35 ft away. The ultrasonic transducers can be attached to a roof bolt, placed in an unsupported area (by means of a toss basket), or handheld.
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