Investigation of laser vibrometer for remote assessment of roof strata condition
The deterioration of ground, such as rock delamination and fracturing, can cause considerable safety concerns and result in significant interruptions to production.There is a change in seismic resonant frequency when strata are prone to collapse.An efficient way to diagnose the deterioration process and predict impending hazards is through performing repeated seismic surveys.In this paper, a laser vibrometer method is proposed to sense roof rock condition of an underground coal mine roadway.Laboratory experiments using a laser vibrometer PDV-100 were carried out on a rock block with 11 large holes.Seismic resonance measurements were collected when the holes were empty, filled with water, filled with sand, and filled with water and sand, to simulate different rock conditions.The results have shown that the changes of the rock structure when filled with different materials can be reliably resolved using both seismic waveform duration and dominant frequency content.Highly compacted rock mass delivers a higher response frequency and short seismic duration.When voids develop inside the rock, the seismic ringing signal becomes significant.In these experiments, the laser vibrometer has proven to be an efficient tool for noncontact seismic monitoring.This instrument can be further improved and it can also be mounted on an underground vehicle to scan roof conditions while driving on an underground mine roadway.
Xun Luo Joey Duan Yulin Ye
Geomechanics and Ground Control CSIRO Coal Mining Research Program/Energy Flagship1 Technology Court, Pullenvale, QLD 4069, Australia
国际会议
The 34th International Conference on Ground Control in Mining (ICGCM) 2015(34届国际采矿岩层控制会议)
焦作
英文
192-197
2015-10-17（万方平台首次上网日期，不代表论文的发表时间）