Method for detecting stability of roadway group surrounding rock by utilizing blasting operation vibration waves

Abstract

The invention discloses a method for detecting the stability of a roadway group surrounding rock by utilizing blasting operation vibration waves. The method comprises the following steps: taking blasting earthquake waves of roadways under construction as detection signal sources; distributing a blasting earthquake monitoring instrument in each constructed roadway; utilizing a distance and a time difference of two adjacent measuring points to obtain transmission apparent velocities of each earthquake wave among the adjacent measuring points of a roadway surrounding rock to be detected; calculating quality factors of rock bodies of the adjacent measuring points by utilizing predominant frequencies of the different measuring points; judging the quality of the surrounding rock by utilizing the change of the apparent velocities and the quality factors. According to the method disclosed by the invention, a concept of an earthquake exploration technology is used for reference and blasting direct waves which have strongest energy and are most easily recognized are sufficiently utilized, the direct waves are recorded, and the treatment on the aspects of time and frequency is carried out; the change of a time domain and a frequency domain index is utilized to realize the back analysis of the state of the roadway group surrounding rock.

Description

technical field [0001] The invention relates to a method for monitoring the stability of surrounding rock during blasting and excavation of roadway groups. Background technique [0002] At present, in the construction of underground roadway groups, the construction is often carried out sequentially, and the roadway constructed earlier will inevitably be affected when the roadway behind is constructed. Because the blasting seismic waves in the construction process will have a strong degradation effect on the existing joints and fissures in the rock mass, aggravate the cracking of the surrounding rock, and thus affect the stability of the surrounding rock of the adjacent roadway. Therefore, in the later blasting construction, it is necessary to detect the previously constructed roadway in order to control the blasting vibration effect. [0003] The current monitoring method for the stability of the surrounding rock of the roadway is mainly displacement monitoring, such as the...

AI Technical Summary

Problems solved by technology

However, the microseismic method is a passive test method. It has to wait for the microseismic event to occur, and the location of the microseismic event and the strength of the signal are random, and it is difficult for human intervention, which has a great impact on the measurement results.

It is often difficult to determine the criteria for roadway stability judgment by using microseismic, and there are great differences between different rocks

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