Lossless detection method for strata pressure movement law

Abstract

The invention discloses a lossless detection method for a strata pressure movement law, and relates to the technical field of strata pressure movement law detection. A test section set is arranged at every three columns of anchor rods in a roadway 50 m along ahead the axis of the roadway from the end of a coal face, and top plates of the test section sets and the anchor rods, needing anchor rod axial force testing, on the two sides; a mine intrinsic safety type anchor rod lossless detection system is adopted to perform anchor rod axial force testing on the numbered anchor rods; along with the fact that the coal face is advanced forwards, test sections need to be continuously added on the outer section of the roadway in the advancing direction of the coal face to enable a test zone to always be kept about 50 m, and the axial force testing times of each anchor rod is more than six times; the test axial force of each anchor rod serves as a vertical coordinate, the advancing distance of the coal face serves as a horizontal coordinate, the vertical coordinates and the horizontal coordinates are input into a two-dimensional coordinate system to draw a graph, an axial force change law of the anchor rods which are away from the coal face at different distances can be obtained, and then the roadway surrounding rock strata pressure movement law of coal face advancing is further 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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