Microquake multi-parameter early warning method of rock burst in high-stress concentration area

Abstract

The invention discloses a microquake multi-parameter early warning method of a rock burst in a high-stress concentration area. Microquake signals are recorded by use of a microquake monitoring system, and a microseismicity S value, a microseismic time information entropy Qt value, a microquake accumulation impact index E value and a microseismic activity abnormal index |Z| value are calculated and analyzed; after obtained data is analyzed, evolution graphs of the four indexes are respectively drafted; according to the drafted evolution graphs, whether the phenomena occurs in the same time period is analyzed that the microseismicity S value is firstly decreased within seven days and then is rapidly increased at a rate greater than a decreasing rate, the microseismic time information entropy Qt value is continuously decreased within four days, the microquake accumulation impact index E value is greater than a critical value Em and the microseismic activity abnormal index |Z| is greater than three, if the two to four from four indexes occur in the same time period, it is determined that a rock burst is about to take place. According to the invention, an early warning of the impact burst is given in an integrated mode by use of multiple parameter indexes, and thus the early warning accuracy can be effectively improved.

Description

technical field [0001] The invention relates to an early warning method for rock burst, in particular to a microseismic multi-parameter early warning method for rock burst in a high stress concentration area, and belongs to the technical field of microseismic monitoring and early warning. Background technique [0002] In recent years, with the increasing depth of coal mining in my country, the problem of rock burst in many mining areas has become more and more serious. Coal mine rock burst is the pressure in the coal rock mass exceeds the strength limit, and the energy accumulated in the coal rock mass around the roadway or stope is suddenly released, and an explosive accident occurs in the shaft roadway, and the power throws the coal rock to the roadway, making a violent sound at the same time , is a kind of mine earthquake induced by mining, and it is a kind of disaster. It not only causes the vibration and damage of coal and rock mass, the collapse and damage of some road...

AI Technical Summary

Problems solved by technology

The traditional method of using mine pressure to predict rockburst has relatively large limitations, and the traditional method has a series of disadvantages such as time-consuming and labor-intensive, requiring personnel to record on-site operations, low safety and high economic cost.

At present, although there is a method of using microseismic monitoring to predict rock burst, most of them use a single index for prediction, resulting in low early warning accuracy and unable to meet the early warning needs of mines

Images