Non-contact mine pressure observing and estimating method

Abstract

The non-contact mine pressure observation and evaluation method involves a technology to monitor and evaluate the relative stress state of the mine excavation space or the surrounding rock of the tunnel through the non-contact monitoring of the electromagnetic radiation information generated by the loaded coal rock mass. The observation method is as follows: first To select the area that needs to be monitored, the effective receiving direction of the directional receiving electromagnetic antenna is aligned with the measuring point, and Ei is obtained after the test is completed until all the measuring point tests are completed. The evaluation method is as follows: the index of mine pressure evaluation adopts the average value Ei of electromagnetic radiation intensity of coal and rock, and calculates the average value Eavg of electromagnetic radiation intensity Ei of all measuring points; the test result Ei is displayed in the figure, when the measured electromagnetic radiation intensity is greater than When Eavg, the measuring point is evaluated as a high-stress point; for the area where the electromagnetic radiation intensity values ​​of more than two consecutive measuring points are greater than Eavg, it is evaluated as a high-stress area; for the electromagnetic radiation intensity of two or more adjacent measuring points The area where the radiation intensity shows a sharp increase of more than 1 times or a sharp decrease of more than 50% is evaluated as a high stress gradient area.

Description

technical field [0001] The invention relates to a technology for monitoring and evaluating the relative stress state of mine excavation space or tunnel surrounding rock through non-contact monitoring of electromagnetic radiation information generated by loaded coal rock mass, belonging to the technical field of mine pressure monitoring and evaluation. Background technique [0002] In the process of human mining, the mining activities destroy the stress balance state of the original rock, causing the redistribution of the ground stress around the mining space. Around the stope and mining roadway, due to the stress of the surrounding rock, the surrounding rock is deformed, destroyed and moved, and the roof collapses and comes under pressure, the roof and the floor move closer, the support is loaded and shrinks, and the fracture occurs. , There may also be dynamic phenomena such as coal and gas outburst, water inrush, and rock burst. [0003] Therefore, monitoring and evaluati...

AI Technical Summary

Problems solved by technology

Invention patent "Method and device for predicting gas-bearing coal rock concrete disasters, (ZL98111185.8)" through non-contact monitoring of the electromagnetic radiation signal generated when the loaded coal rock mass deforms and ruptures and its short-term (several minutes) change law, forecasting The danger of coal and rock dynamic disasters such as coal and gas outburst and rock burst reflects the instantaneous state of a certain stage in the evolution process of coal and rock dynamic disasters. It has not realized continuous and uninterrupted monitoring and forecasting, and cannot share KJ Resources for Coal Mine Safety Monitoring Systems

[0010] The utility model patent "Electromagnetic Radiation Monitoring Device for Coal and Rock Dynamic Disasters, Patent No. ZL01272808.X" can continuously monitor and warn the danger of coal and rock dynamic disasters when an external power supply is connected, but it cannot be connected with the KJ series coal mine safety monitoring system. Share the power supply and transmission channel of the safety monitoring system, separate wiring and separate power supply are required to realize remote monitoring, and the forecasting function is weak

Images