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Method for improving actual measurement precision of mining-induced stress

A technology for mining stress and accuracy, applied in force/torque/work measuring instruments, force sensors in the holes of force-bearing structures, measuring devices, etc. limited issues

Active Publication Date: 2020-07-07
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problems that the current method of actually measuring the mining stress has many defects, very limited applicable conditions, low test accuracy, poor stability, low reliability, and even the measured data is far from the actual problem, and proposes a method that significantly improves the mining stress. The method of measuring the accuracy of dynamic stress can effectively guide the selection of roadway location, the determination of support configuration, the control of surrounding rock in the stope, and the prevention and control of rock burst.

Method used

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  • Method for improving actual measurement precision of mining-induced stress
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  • Method for improving actual measurement precision of mining-induced stress

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Experimental program
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Embodiment 1

[0063] figure 1 It is a schematic diagram of a method for improving the actual measurement accuracy of mining stress of the present invention in a solid coal area. From the figure, it can be seen that a three-channel sealing plug 3, a stress gauge 1 and a fixed pressure gauge are arranged sequentially along the surrounding rock borehole 6 from shallow to deep. The outside of the distance rod 4 and the surrounding rock drilling 6 forms a consolidation zone 5 between the grout and the surrounding rock after grouting, and the diameter of the surrounding rock drilling 6 in the figure is d， The strain gauge diameter is d 0 , the slurry diffusion distance outside the surrounding rock drilling is c, and the roadway crushing zone width is b 1 , the roadway plastic zone width is b 2 ; Implement concrete method and step of the present invention to be respectively:

[0064] Step 1: Take a coal sample in the actual coal area to be measured, and test the uniaxial compressive strength...

Embodiment 2

[0076] Such as figure 2 , the method and specific implementation steps to improve the accuracy of the actual measurement of mining stress when the test location is in the yielding coal pillar area are as follows:

[0077] It can be seen from the figure that there are four-channel sealing plugs 9, stress gauges 1, distance rods 4 and single-channel sealing plugs 8 arranged along the coal pillar borehole 12 from shallow to deep. After grouting, the slurry and coal pillar consolidation zone 11 is formed. The diameter of the coal pillar drilling hole in the figure is d m ， The strain gauge diameter is d 0 , the slurry diffusion distance outside the coal pillar borehole is f , the distance between the stress gauge and the single-channel grout stopper is h 0 ; The distance between the stress gauge and the four-channel grout stopper is h， The concrete method and steps of implementing the present invention are respectively:

[0078] Step 1: Take a complete coal sample of the...

Embodiment 3

[0087] The method and specific implementation steps for improving the accuracy of the actual measurement of the mining stress when the actual measurement position of the mining stress is in the solid coal area, if the actual measurement position is in the rock mass area, the hole is grouted, and the grouting pressure is preferably 1 ~ 10MPa , if the uniaxial compressive strength of the rock mass is greater than 40MPa, the grouting pressure is 4~10MPa, and if the uniaxial compressive strength of the rock mass is less than 40MPa, the grouting pressure is 1~4MPa, which meets the requirements of the broken zone of the borehole. The rock mass in the plastic zone can be consolidated by grouting.

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Abstract

The invention relates to a method for improving the actual measurement precision of mining-induced stress. The device comprises a stress meter, a hole sealing plug, a spacing rod, a grouting pipe andan elastic rubber sleeve. The method comprises the following steps: firstly, testing coal-rock mass strength and elasticity modulus of a stress meter planned mounting layer in a laboratory; preparinggrouting materials with the same or similar mechanical characteristics; drilling a hole in a coal-rock mass with mining stress to be measured, installing a borehole stress meter and grouting the drilled hole, so the broken and plastic surrounding rock on the periphery of the drilled hole is solidified again, and the drilled hole and the surrounding rock have the mechanical property of the completecoal and rock mass; when the mining stress is changed, the grouted drilled surrounding rock can transmit the mining stress to the drilled hole stress meter in time, effectively and basically in a lossless mode, and the actual measurement precision of the mining stress is remarkably improved. The method is suitable for mining-induced stress actual measurement under various surrounding rock conditions, and many defects of a traditional testing method are effectively overcome; the method is simple, testing is reliable, precision is high, and very important application and popularization value isachieved.

Description

technical field [0001] The invention belongs to the field of mining engineering, and relates to a method for improving the accuracy of actual measurement of mining stress, which is a method for actually measuring the size of mining stress, whether it changes and the degree of change during the coal mining process, and the method can significantly improve the accuracy of actual measurement of mining stress. Background technique [0002] Coal mining will inevitably produce mining stress, and the degree and scope of influence of mining stress are directly related to mine development layout and how to achieve safety, high production and high efficiency in the mining process, such as the reasonable layout of various roadways and support configurations. And how to avoid high bearing pressure, the position and form of pressure relief, and the selection of rock burst prevention methods, etc., so the high-precision actual measurement of mining stress is very important. However, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
CPCG01L5/0004
Inventor 陈冬冬何富连谢生荣
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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