초록 ▼

This invention relates to an integrated acoustic network system to provide warning of impending groundfall in underground mines. The system includes a plurality of geophones which derive acoustic signals by which the source of seismic disturbances is located, and an array of high frequency piezoelec

This invention relates to an integrated acoustic network system to provide warning of impending groundfall in underground mines. The system includes a plurality of geophones which derive acoustic signals by which the source of seismic disturbances is located, and an array of high frequency piezoelectric sensors which pick up signals from small ground disturbances which precede groundfall. A warning system is provided both at the scene of mining operations and at a central location of impending groundfall and of the location of its occurrence.

대표청구항 ▼

An intergrated acoustic network system for providing a warning of impending groundfall in a mine comprising: an array of high frequency microseismic sensor means situated at space locations in said mine to receive high frequency microseismic signals related to movement in ground formations adjacent

An intergrated acoustic network system for providing a warning of impending groundfall in a mine comprising: an array of high frequency microseismic sensor means situated at space locations in said mine to receive high frequency microseismic signals related to movement in ground formations adjacent said mine; an array of at least four low frequency seismic sensor means situated at spaced locations in said mine to receive low frequency seismic signals related to stress build up in ground formations adjacent said mine; data processing means; means for transmitting said high and low frequency signals from said arrays to said data processing means; said high frequency sensor means being utilized for time prediction and said low frequency sensor means being utilized for location prediction; said data processing means processing signals from said high and low frequency arrays to calculate a ratio of energy/event count to provide a distinct anomaly prior to groundfalls and thereby recognize and determine the location of an impending ground failure; and a warning system connected to said data processing means to receive signals of an impending ground failure therefrom.