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A Construction Method of Pressure Relief Hole Based on Dynamic Monitoring of Mining Stress

A mining stress and dynamic monitoring technology, applied in drilling equipment and methods, measurement, earthwork drilling, etc., can solve the problems of stepped pressure relief holes with great influence on pressure relief effect, difficult to achieve dynamic measurement, and complicated construction. , to achieve the effect of accurate selection of reaming position and reaming depth, reducing construction costs and saving measurement time

Active Publication Date: 2021-05-28
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional equal-diameter pressure relief hole, the stepped pressure relief hole has a better pressure relief effect and can better protect the integrity of the surrounding rock. However, in order to achieve a better pressure relief effect, it is necessary to How to determine the distribution of the mining stress conveniently and quickly has a great influence on the pressure relief effect of the stepped pressure relief hole
[0004] Commonly used methods for measuring mining stress include cuttings rate index method or advanced buried stress gauge measurement method, but with the continuous mining of the working face, the distribution of mining stress is constantly changing, while the drilling cuttings method and buried stress gauge The construction of the method is complicated, so it is difficult to realize dynamic measurement

Method used

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  • A Construction Method of Pressure Relief Hole Based on Dynamic Monitoring of Mining Stress
  • A Construction Method of Pressure Relief Hole Based on Dynamic Monitoring of Mining Stress
  • A Construction Method of Pressure Relief Hole Based on Dynamic Monitoring of Mining Stress

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Embodiment 1

[0025] Drilling cuttings method is a method to identify impact hazards by drilling small-diameter holes in the coal seam according to the amount of pulverized coal discharged and its variation and related dynamic effects. The detection indicators include the amount of pulverized coal, depth and dynamic effects. The amount of pulverized coal can determine the corresponding stress state of the coal body.

[0026] Large-diameter borehole pressure relief refers to the implementation of boreholes with a diameter of not less than 110mm in the stress concentration area or possible stress concentration area of ​​the coal and rock body, through the discharge of a large amount of coal deformation or drilling impact in the damaged area around the borehole. Coal powder can expand the coal damage area around the borehole, so that the stress concentration of the coal rock mass in a certain stress area around the borehole can be reduced or the high stress can be transferred to the depth of th...

Embodiment 2

[0037] This embodiment takes the implementation of the second mining area of ​​a certain mine as an example to further explain the construction method of the pressure relief hole based on the dynamic monitoring of mining stress, as follows.

[0038] first step, such as figure 1 As shown, in the transportation trough of the first mining face, at the position of the coal side that is not affected by mining, a ZDY-650 full hydraulic tunnel drilling rig for coal mines is erected to drill measurement holes, and the measurement holes A and A are perpendicular to the coal wall. B, the hole depth is 10m, and the hole spacing is 5m. The drilling cuttings method is used to measure the distribution of mining stress in the measurement hole A. The ZHJ-2SZ-6ST-3 type vibration velocity sensor is used to measure the hole B. The vibration velocity sensor is fixed on On the drill pipe, measure the vibration frequency of the drill pipe in real time during drilling, and cooperate with the HK-04T...

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Abstract

The invention provides a pressure relief hole construction method based on the dynamic monitoring of mining stress, relates to the technical field of mine rockburst prevention and control, and specifically drills measurement boreholes in the transport channel of the first mining working face in the mining area, and the measurement boreholes A obtains the mining stress distribution curve of the working face, and measures the drill hole B to obtain the vibration frequency diagram; after mining at the first mining face, drill holes to the side of the working face in the gob-side roadway of the next working face, and obtain the mining data of the drilling hole C respectively. Dynamic stress distribution and vibration frequency diagram of borehole D; by comparing the measured stress distribution curves of borehole A and borehole C with the vibration frequency diagrams of measured borehole B and borehole D, the mining stress distribution and drill pipe vibration frequency can be obtained In the mining process of the working face in the same mining area, a multi-stage variable-diameter reaming-while-drilling drill pipe rig is used, and the vibration frequency signal of the drill pipe is collected in real time to ream the high stress distribution area; this method realizes real-time Measure the stress distribution law, and can accurately construct drilling pressure relief according to the stress distribution.

Description

technical field [0001] The invention relates to the technical field of mine rockburst prevention and control, in particular to a pressure relief hole construction method based on dynamic monitoring of mining stress. Background technique [0002] Rock burst is a complex mine dynamic disaster, and it has always been one of the difficulties in the research of rock mechanics and mine prevention and control. In the process of coal mining, once a rock burst occurs, it will cause major disasters and accidents. [0003] At present, the drilling pressure relief method is one of the more commonly used methods to reduce the risk of coal rock impact. The pressure relief hole of the same diameter is generally used for pressure relief in drilling holes, but if the diameter of the pressure relief hole is too small, the expected pressure relief cannot be achieved. As a result, if the aperture is too large, it will cause damage to the surrounding rock and affect the stability of the surroun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/00E21B7/28E21B47/00
CPCE21B7/00E21B7/28E21B47/00
Inventor 郝建边华陈安法石永奎周光华董洪青林玉玺杨秉真刘建康张广超赵增辉栾恒杰
Owner SHANDONG UNIV OF SCI & TECH