Study on the Calculation of Attenuation Quality Factor Q-Value in Microseismic Monitoring: Results from Two Rock Engineering Cases

Abstract

The quality factor Q-value is one of the important parameters for calculating microseismic source parameters, and it is also an important reference for reflecting geological information. However, there are few studies on the Q-value of rock engineering at present, and its understanding needs to be further improved. For the above reasons, we adopted the widely used Atkinson method to calculate Q in two rock engineering. The results show that the Q in the microseismic monitoring is mainly on the order of 101∼102, which is generally smaller than the Q in earthquake seismology. When the frequency is less than 500 Hz, the Q is a constant, and when the frequency is greater than 500 Hz, it increases with the frequency. The research results also show that the Q in the engineering with high in-situ stress and complete rock mass structure is larger than that in the low in-situ stress and broken rock mass is relatively broken, indicating that the Q-value can reflect the geological information to a certain extent.