A method for non-destructive monitoring of mine pressure activity law

Abstract

The invention discloses a method for non-destructive monitoring of mine pressure activity law, and relates to the technical field of mine pressure activity law monitoring. Starting from the end of the coal mining face, set up a set of test sections for every 3 rows of anchor rods in the roadway 50m forward along the roadway axis. The bolts are numbered; the mine intrinsically safe bolt non-destructive testing system is used to test the bolt axial force of the numbered bolts; as the coal mining face advances, it is necessary to continue to increase the test section along the advancing direction of the working face in the outer section of the roadway , so that the test section is always kept at about 50m, and the number of tests for the axial force of each bolt exceeds 6 times; the axial force of each bolt is taken as the vertical coordinate, and the advancing distance of the coal mining face is taken as the horizontal coordinate, and the two-dimensional coordinates are input By plotting in the system, the variation law of the axial force of the bolt at different distances from the working face can be obtained, and then the law of the mine pressure activity of the surrounding rock of the coal mining face advancing can be obtained.

Description

technical field [0001] The invention relates to the technical field of monitoring the law of mine pressure activity, in particular to a method for non-destructive monitoring of the law of mine pressure activity. Background technique [0002] As the main energy source in my country, coal has always accounted for more than 65% of the energy production and consumption structure. According to the latest data from the National Bureau of Statistics in 2015, the output of raw coal has increased year by year from 1.25 billion tons in 1998 to 3.87 billion tons in 2014; it is expected that my country's coal demand peak will appear in 2020, with a peak level of 4.1 to 4.7 billion tons. For a long period of time in the future, the continuous and stable supply of coal is related to the overall situation of my country's modernization construction and is an important guarantee for the healthy development of my country's economy. [0003] With the gradual depletion of shallow resources, co...

AI Technical Summary

Problems solved by technology

[0007] ① It is necessary to arrange measuring points and install relevant monitoring instruments in advance, and it is not possible to implement force monitoring of bolts in a large area;

[0008] ②Due to differences in bolt construction and hydraulic pillow installation operation of each worker, the contact area between the hydraulic pillow and the rock surface is different, resulting in differences between the monitoring results and the actual stress situation;

[0009] ③The structure of the hydraulic pillow is relatively complex. With the increase of the force on the bolt and the extension of the action time, the hydraulic pillow is easily damaged or the monitoring results are distorted;

[0010] ④ The bolt force monitoring stations installed at fixed points in advance (most mines arrange a group every 50m), cannot effectively evaluate the force state of the bolt in this area of ​​the roadway, and cannot make a reasonable evaluation of the bolt support state; at the same time, Unable to find abnormal sections or hidden dangers of the roadway well

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