Quantitative monitoring method of dynamic stress range in 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: 2015-08-19
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 rock formation is obvious, and it is difficult to establish the judgment criteria for the dynamic stress range. The current observation means and It is difficult to obtain quantitative values ​​by the method

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  • Quantitative monitoring method of dynamic stress range in coal mine
  • Quantitative monitoring method of dynamic stress range in coal mine

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Embodiment Construction

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

[0017] 1. Obtain the judgment value of the static sensitivity criterion

[0018] During the mining of the working face and the excavation of the roadway, 4-6 roof dynamic instruments are arranged 200 meters away from the working face and the working place of the roadway, and the distance between the roof dynamic instruments is 1.0 meters. See figure 1 ; Observing the undisturbed Confucian characteristics of the roof through the roof dynamic instrument, after more than 2 days of continuous observation, the undisturbed roof sinking velocity is obtained, the undisturbed area is initially delineated, and the average value of multiple data is taken as Judgment value of static sensitivity criterion;

[0019] 2. Dynamic stress approximation observation

[0020] From the undisturbed area to the coal wall of the working face and near the head of the roadway, a r...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/00
Inventor 潘立友陈理强
Owner SHANDONG UNIV OF SCI & TECH
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