Method for calculating propagation speed of earthquake waves in mine region by utilizing microearthquake point as earthquake source

Abstract

The invention discloses a method for calculating the propagation speed of earthquake waves in a mine region by utilizing a microearthquake point as an earthquake source, comprising the following steps: determining the coordinate estimated value of the microearthquake point according to the earthquake wave time generated by the microearthquake point measured by multiple preset sensors; determiningall possible propagation paths of the earthquake waves generated by the microearthquake point to the preset sensors according to the coordinate estimated value of the microearthquake point and the speed layer where the preset sensors are; selecting the possible propagation path with the difference between the earthquake wave propagation time and the earthquake wave time measured by the preset sensors corresponding to a preset range from all the possible propagation paths as a fixed propagation path; and calculating the propagation speed of the earthquake waves according to the determined fixed propagation path and the initial value of a three-dimensional continuous speed diamond on the fixed propagation path.

Description

technical field [0001] The invention relates to a calculation method for calculating the propagation speed of seismic waves, in particular to a method for calculating the propagation speed of seismic waves in mining areas by using microseismic points as seismic sources. Background technique [0002] The propagation velocity of seismic wave is one of the most effective on-site indicators to reflect the stress state of rock. [0003] The seismic wave propagation velocity of the local rock in the mining area increases with the increase of the stress. When the stress exceeds the bearing capacity of the rock, the rock will be destroyed rapidly, and the damaged rock will rapidly reduce the propagation speed of the seismic wave. More importantly, the propagation velocity of seismic waves is also an effective indicator to reflect the physical state of rocks. For example, when the rock is filled with gas or water, it will not only greatly reduce the propagation speed of the seismic...

AI Technical Summary

Problems solved by technology

This method needs to arrange exploration equipment in advance. In production mines, the arrangement of exploration equipment is not only limited by space, but also needs to stop work and production, which is very impractical for the mining process.

More importantly, it cannot be used for real-time monitoring

Therefore, although the propagation speed of seismic waves can effectively provide a large amount of information that is beneficial to mine safety production, it cannot be applied in the field

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