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Method for measuring the leading action range of progressive breaking of multi-level key layers

A technology of advance action and measurement method, which is applied in earth-moving drilling, wellbore/well components, construction, etc., to achieve the effect of broad application prospects, high reliability and simple operation process

Active Publication Date: 2021-07-13
DATONG COAL MINE GRP
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  • Abstract
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Problems solved by technology

[0003] In order to solve the problems of reliability, hysteresis and restrictiveness in the determination of the leading influence range of hard roof fracture, the present invention provides a method for measuring the progressive breaking leading action range of multi-level key layers

Method used

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  • Method for measuring the leading action range of progressive breaking of multi-level key layers
  • Method for measuring the leading action range of progressive breaking of multi-level key layers

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with specific examples.

[0019] A method for determining the range of advance action of a multi-level critical layer progressively broken, such as figure 1 Shown: including the following steps:

[0020] ①Before the mining of the underground working face of the mine, the drilling TV observation hole is drilled vertically downward from the surface along the advancing direction of the working face, and the structure and lithology of the overburden layer on the working face are observed through the drilling TV, and the thickness of each rock layer, Occurrence and lithology;

[0021] ②Take part of the drilled TV observation hole core to test the mechanical properties of the rock formation. Mechanical parameters, through the key layer theory, calculate the position of the multi-layer key layer on the working surface;

[0022] ③ Make a physical similar model, set a similar ratio, and calculate the ratio n...

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Abstract

The invention discloses a method for measuring the advance action range of progressive breakage of multi-level key layers, which relates to the field of measurement of the advance action range of overlying hard roof breakage after coal seam mining, and specifically solves the current domestic and foreign problems of accurately measuring the breakage action range of hard roofs. method. The present invention is based on on-site drilling and physical and mechanical parameters of coal and rock mass measured in the laboratory. A physical similar model is laid in the laboratory, and a high-definition high-speed camera is used to monitor the change of black speckle spots on the surface of the model in the whole process. The displacement change curve of the spot, the range where the displacement change is greater than zero is the leading influence range of the key layer. The invention adopts the research method of laboratory physical similarity simulation, which is easy and reliable, and the operation process is simple; the model parameters are all taken from the field, and the reliability of the test results is high; the prediction results can provide a theoretical basis for the support design of the advanced roadway on the spot , has practical significance and broad application prospects.

Description

technical field [0001] The invention relates to the field of measuring the action range of the overlying hard roof breaking on the leading coal body of the working face after the coal seam is mined in the hard roof mining area, specifically a method for measuring the leading action range of the gradual breaking of multi-level key layers. Background technique [0002] Rock formation control is the core of safe and efficient mining in coal mines, and hard roof control is a major difficulty in rock formation control. The hard roof has high strength, strong compressive capacity, and large breaking step. Its breaking instability will generally have a squeezing effect on the leading coal body, resulting in the occurrence of strong mine pressure phenomena such as severe damage to the leading coal body on the working face, and even lead to mine failure. Rock shock dynamic disaster. At present, the determination of the leading impact range of hard roof fracture is mostly from the pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F17/00E21B47/002E21B49/00
CPCE21B49/00E21F17/00
Inventor 于斌杨智文刘锦荣付茂全王少卿
Owner DATONG COAL MINE GRP
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