Acoustic emission location and wave velocity imaging monitoring and catastrophe early warning method for roadway surrounding rock damage

Abstract

The invention discloses a roadway surrounding rock destruction acoustic emission positioning and wave velocity imaging monitoring and catastrophe early warning method, which performs positioning, wave velocity imaging monitoring and catastrophe early warning according to the acoustic emission signal generated by the surrounding rock damage in the roadway excavation process; using the excavation roadway and adjacent roadways, Combined with the (long) drilling installation method, an optimized acoustic emission sensor network is established to obtain the location and energy of high-precision acoustic emission events caused by roadway excavation and surrounding rock damage, and a certain number of acoustic emission location events are selected as known seismic sources. Wave velocity imaging of high-precision acoustic emission positioning; combined with high-precision acoustic emission positioning, wave velocity imaging and wave velocity difference imaging results, continuous monitoring of the deformation and failure process of the surrounding rock in the roadway excavation face, comprehensive time, space, energy, The number and the stress area where the hazard level is evaluated can realize the catastrophe early warning of the damage to the surrounding rock of the excavation roadway, and provide technical support for the safe and efficient excavation of the roadway.

Description

technical field [0001] The invention relates to a roadway surrounding rock failure monitoring and catastrophe early warning method, in particular to a roadway surrounding rock damage acoustic emission positioning and wave velocity imaging monitoring and catastrophe early warning method, which belongs to the field of rock mass deformation damage rupture and engineering geophysical monitoring and early warning technology field. Background technique [0002] With the depletion of shallow coal resources in my country, the depth of coal mining has increased year by year. Under deep mining conditions, the roadway excavation process is faced with high gas content and pressure, high ground stress, and increasingly complex geological structures. In the tunneling process of deep underground engineering, especially in the tunneling process of coal mine underground tunnels, a stress concentration area will be formed in front of the tunneling face, which will cause the coal rock layer i...

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN110703320A discloses a microseismic monitoring system and method for combining the upper and lower shafts. The microseismic monitoring system on the ground is added to make the whole underground including the monitoring area in three-dimensional monitoring. Pressure monitoring and early warning, acoustic emission sensors are deployed throughout the mine, and it does not involve how to form an optimized network layout method for acoustic emission sensors in the process of excavating a single roadway

In addition, this type of technology mainly involves large-scale roof and floor fractures caused by mining activities. A small-energy high-precision event screening method has not been proposed. The positioning accuracy of small-energy events is not high. In all aspects, it is not very suitable for acoustic emission monitoring of coal and rock mass damage such as small coal guns produced during roadway excavation.

Chinese patent CN104454010A discloses a dynamic comprehensive monitoring and early warning system and early warning method for deep well tunneling construction. Only acoustic emission signal sensors and microseismic pickup monitoring stations are arranged in the tunneling tunnel to collect internal cracking and instability signals of surrounding rocks; Chinese patent CN104018790A A roadway rock burst early warning method based on ground sound monitoring is disclosed. Two acoustic emission sensors are arranged in areas with potential impact hazards with a distance of 100-150m. As the working face advances, the two probes move forward alternately , this type of method does not make full use of the roadway and adjacent roadways, and does not use the acoustic emission sensor installation method to drill (long) holes into the coal formation to optimize the network

Chinese patent CN105257339A discloses a multi-parameter comprehensive monitoring and early warning method for tunneling working face, and proposes the idea of ​​partition monitoring for tunneling working face, coupling the changes of each monitoring value in different partitions, and using multi-parameter comprehensive monitoring as the early warning parameter, However, it cannot combine the results of acoustic emission source location, wave velocity imaging, and wave velocity difference imaging to monitor and evaluate the deformation and damage of surrounding rock during roadway excavation, and determine the stress state, degree of surrounding rock and its temporal and spatial evolution process of roadway surrounding rock.

Chinese patent CN109441547A discloses a real-time monitoring and early warning system and method for coal and gas outburst in mining face. According to the microseismic event change characteristic index and gas emission change characteristic index, a coal and gas outburst fuzzy evaluation comprehensive early warning model is established, but there is no comprehensive consideration Acoustic emission event quantity, energy, time, high-precision positioning, wave velocity and wave velocity difference information and other factors, monitoring and early warning of disasters such as rock burst and coal and gas outburst in roadway excavation

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