Method for quantitatively monitoring dynamic stress range of coal mine

A technology of dynamic stress and range, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of difficulty in establishing dynamic stress range judgment criteria and difficult to obtain quantitative values.

Inactive Publication Date: 2012-06-27
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] As for the quantitative observation of the dynamic stress range, there is no systematic and reliable observation method. Especially in the deep wells greater than 800 meters, the softening effect of the

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  • Method for quantitatively monitoring dynamic stress range of coal mine
  • Method for quantitatively monitoring dynamic stress range of coal mine
  • Method for quantitatively monitoring dynamic stress range of coal mine

Examples

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[0016] The implementation of the present invention will be described below with reference to the accompanying drawings.

[0017] 1. Obtaining the judgment value of the static sensitive criterion

[0018] During the mining of the working face and the excavation of the roadway, 4-6 roof dynamic instruments shall be arranged at a distance of 200 meters from the working surface of the working face and the roadway. figure 1 ; Observe the undisturbed deformation characteristics of the roof through the roof dynamic instrument, and obtain the undisturbed roof sinking speed after continuous observation for more than 2 days. Static sensitive criterion judgment value;

[0019] 2. Dynamic stress approximation observation

[0020] Starting from the undisturbed area and ending near the coal wall of the working face and the head of the roadway, a roof dynamic instrument is arranged at a distance of 10 meters to continuously observe the roof subsidence speed and obtain the location of the s...

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Abstract

The invention discloses a method for quantitatively monitoring a dynamic stress range of a coal mine. The method comprises the following steps of: obtaining a static sensitive criterion determination value at first, then approaching and observing by adopting dynamic stress, continuously observing a sinking speed of a top plate from a non-disturbed region to obtain a sudden change place of the sinking speed of the top plate, continuously observing at the place by gradually reducing the spacing distance between dynamic apparatuses till the spacing distance is less than 0.5 m, and gradually approaching the static sensitive criterion determination value to obtain a quantitative influence range value. According to the invention, a static sensitive criterion is obtained by installing a sensitive dynamic apparatus in a region far away from a working surface and a roadway working place; then, a dynamic stress range is obtained by gradually approaching the working place by adopting a combination top plate dynamic method; a dynamic stress distribution rule is quantitatively described; and the dynamic stress range is judged in time.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] The mining of the underground working face is always in dynamic movement, and the dynamic stress formed by the mining of the working face is changing. Determining the range of the dynamic stress has important reference significance for the determination of the advanced support range of the working face and the prediction range of the impact coal seam. The current monitoring technology mainly includes the following aspects. [0003] Stress method: distribution characteristics of abutment pressure, that is, the peak value of abutment pressure and its distance from the coal wall. Its measurement is generally monitored by the borehole stress method. By drilling holes with a diameter of 42-50 mm in the coal seam, the stress distribution range is judged according to the change of the stress. However, because the stiffness of the stress monitoring body does not match ...

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Application Information

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IPC IPC(8): G01L1/00
Inventor 潘立友
Owner SHANDONG UNIV OF SCI & TECH
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