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Multi-point displacement meter for deep part of surrounding rocks of coal mine tunnel

A technology of coal mine roadway and displacement meter, which is applied in the direction of measuring devices and instruments, can solve the problems of difficult positioning and anchoring operations, high cost, and misjudgment of data distortion, and achieve accurate and reliable test data, low cost, and rapid hole making Effect

Active Publication Date: 2017-05-31
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used coal mine multi-point displacement gauge products have disadvantages such as easy looseness of the measuring point, data distortion, and time-consuming and laborious data reading, as well as high cost and difficulty in hole making (the installation hole diameter generally needs to be more than 70mm, and a heavy-duty drilling machine is required to make holes), etc. question
An important reason for data distortion caused by the easy loosening of deep displacement measurement points is that the current deep multi-point displacement measurement points are mostly fixed by cement grouting or purely mechanical attachment. The cement slurry has obvious brittle characteristics. When drilling When shrinkage cavity or surrounding rock is damaged, it is easy to cause loosening of measuring points, resulting in data distortion and misjudgment
The best material for fixed measuring points is resin anchoring agent, which has the characteristics of high strength and high toughness, but the deep drilling space is narrow, and the positioning and anchoring operation is very difficult
In addition, the current multi-point displacement meter in the deep part of the surrounding rock of coal mine roadway lacks an intuitive and fast data reading technology. The displacement data conversion requires a large amount of data processing. It is difficult to quickly and timely judge the evolution of the surrounding rock loose circle, and it is easy to miss the anchor cable The best time to wait for secondary support

Method used

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  • Multi-point displacement meter for deep part of surrounding rocks of coal mine tunnel
  • Multi-point displacement meter for deep part of surrounding rocks of coal mine tunnel
  • Multi-point displacement meter for deep part of surrounding rocks of coal mine tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A multi-point displacement meter for the deep part of the surrounding rock of a coal mine roadway, comprising several measuring point fixing blocks 1 arranged at different depths in a borehole 7, a measuring line through hole 5 is arranged inside the measuring point fixing block 1, and the middle part of the measuring point fixing block 1 The outer periphery of the anchoring part is the anchoring part, and several anchoring nails 2 are embedded in the circumferential direction of the anchoring part. The anchoring nails 2 are anchored on the hole wall of the borehole 7 by the resin anchoring agent 8, and the upper end of the measuring point fixing block 1 is circumferentially provided with an annular concave hole. Groove 3, the ring-shaped groove 3 is wrapped with a packing limit cotton yarn 4, one end of the measuring line 6 is fixed in the middle of the through hole 5 of the measuring line, and the adjacent measuring point fixing blocks 1 are connected by the measuring l...

Embodiment 2

[0027] Drill a horizontal borehole in the side of a coal mine roadway, the depth of the borehole is 25m, and arrange 5 measuring points, including the 1st measuring point, the 2nd measuring point, the 3rd measuring point, the 4th measuring point, the 5th measuring point, the depth They are 25m, 18m, 13m, 8m and 3m respectively. The arrangement of displacement measuring points in the deep part of the surrounding rock of the roadway is as follows: image 3 As shown, the data during the test of the reader is as follows Figure 4 shown. Others are consistent with Example 1.

[0028] Such as Figure 4 As shown, it can be intuitively read that the relative displacement between the first measuring point and the second measuring point is about 2mm, and the relative displacement between the fourth measuring point and the fifth measuring point reaches 22mm. If the data is too large and within several consecutive days The growth rate is very fast, indicating that the plastic failure ...

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Abstract

The invention discloses a multi-point displacement meter for the deep part of surrounding rocks of a coal mine tunnel. The displacement meter comprises measuring point fixing blocks in different depths in a borehole, each measuring point fixing block is internally provided with a measuring line through hole, the periphery of the middle portion of the measuring point fixing block includes an anchoring part, anchoring pins are arranged in an embedded way in the circumference of the anchoring part, one end of a measuring line is fixed to the central position of the measuring line through hole, an orifice of the borehole is provided with a number reader, one arm of the number reader is fixed to the orifice of the borehole, the other arm is provided with a transparent protective shell, the protective shell is provided with a scale plate and a constant resistance device, the constant resistance device presses the measuring line on the protective shell via a fastener, and the measuring line is provided with a card mark. According to the invention, data can be read rapidly and visually, and deformation information of the deep part of the surrounding rocks can be obtained rapidly and visually; measuring points are anchored by resin firmly and reliably without loosening, test data is accurate and reliable, and the cost is low; the requirement for installation holes is low, holes can be made via only a common anchor cable drilling machine, and hole forming is rapid and cheap; and no circuits are included, and the displacement meter is more suitable for an underground environment of a coal mine.

Description

technical field [0001] The invention belongs to the field of stability monitoring of surrounding rocks in coal mine roadways, in particular to a multi-point displacement meter for the deep part of surrounding rocks in coal mine roadways. Background technique [0002] Surrounding rock deep displacement monitoring is an important content of coal mine roadway stability analysis. It is used to judge the deep stability of surrounding rock and the development and evolution state of plastic zone, and based on this to judge the timing of secondary support procedures such as anchor cables and grouting. Accurate, fast and intuitive grasp of the deep stable state of surrounding rock is extremely important for roadway support. [0003] The currently used coal mine multi-point displacement gauge products have disadvantages such as easy looseness of the measuring point, data distortion, and time-consuming and laborious data reading, as well as high cost and difficulty in hole making (the ...

Claims

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Application Information

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IPC IPC(8): G01B21/32
CPCG01B21/32G01B2210/66
Inventor 康永水刘泉声刘滨朱元广卢兴利刘学伟雷广峰王俊涛
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI