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Device and method for monitoring stress and displacement of roadway surrounding rock

A technology of displacement monitoring and surrounding rock stress, which is applied in the direction of measuring devices, measurement, earthwork drilling and mining, etc., can solve the problems of unable to monitor the surrounding rock stress of the roadway, not synchronously monitoring the bolt, and not measuring the displacement of the bolt, etc., so as to save manpower Material force, synchronous force measurement and displacement, and the effect of improving accuracy

Active Publication Date: 2019-08-16
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the monitoring method using the multi-point displacement meter can monitor the displacement changes of the surrounding rock, but the function is relatively single, and it is impossible to monitor the stress of the surrounding rock in the roadway
[0005] In other words, there are currently only anchors for force measurement, but no displacement anchors, let alone simultaneous monitoring anchors

Method used

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  • Device and method for monitoring stress and displacement of roadway surrounding rock
  • Device and method for monitoring stress and displacement of roadway surrounding rock
  • Device and method for monitoring stress and displacement of roadway surrounding rock

Examples

Experimental program
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Effect test

Embodiment 1

[0057] like figure 1 As shown, the present invention provides a stress and displacement monitoring device for the surrounding rock of a roadway, including: a bolt assembly 1, which includes a bolt body 11, a bolt tray 12, and a laser rangefinder 13. The laser The rangefinder 13 is connected to the exposed end of the bolt body 11; the bolt 11 is a full-length anchor bolt, and the bolt 11 is arranged with a small hole 111 along the axis, and the small hole 111 is used to connect the rosette and the computer. The channel of the data transmission wire; the strain rosette 2, the strain rosette 2 is welded on the upper side and the lower side of the outer peripheral wall of the cross section of the anchor rod body 11, and is used to monitor the three strain components of the strain state in the stress process of the anchor rod ε x , ε y and gamma xy .

[0058] like figure 2 As shown, the strain rosettes 2 are divided into two groups, which are the first strain rosette connecte...

Embodiment 2

[0065] The invention also provides a method for monitoring the stress and displacement of the surrounding rock of the roadway, which realizes the simultaneous monitoring of the stress and displacement of the surrounding rock, and achieves the purpose of real-time observation of the displacement change of the roadway.

[0066] It mainly includes the following monitoring steps:

[0067] S1. Measure the strain at the upper and lower two measuring points of the cross section of the bolt body through the strain rosette, and take the average value to measure the strain in the x direction ε x , y-direction strain ε y and shear strain γ xy ;

[0068] S2. According to the force balance relationship of the bolt, the stress of the surrounding rock acting on the bolt tray is obtained, and then the stress of the surrounding rock is obtained;

[0069] S3. According to the geometric relationship between the strain and the displacement, the displacement of the bolt body in the stress proce...

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Abstract

The invention relates to a device for monitoring strains and displacement of tunnel surrounding rocks. The device comprises a high-strength thread steel anchor rod welded with four different forms ofstrain rosettes, an anchor rod tray, two different forms of strain rosettes and a laser range finder, wherein the anchor rod is a full-length anchoring type anchor rod; the strain rosettes are weldedto the upper side and the lower side of an external circumferential wall of the cross section of the anchor rod body; the laser range finder is connected with the exposed end of the anchor rod. The device disclosed by the invention has the beneficial effects that synchronous deformation of the anchor rod and the surrounding rocks and monitoring of the strain rosettes on strains in the different directions are utilized, so that integrated monitoring on the strains and displacement of the surrounding rocks is realized; due to application of the laser range finder connected with the exposed end of the anchor rod, a change curve of relative displacement of the two sides of a tunnel or a top plate and a bottom plate of the device can be drawn out.

Description

technical field [0001] The invention relates to the field of geotechnical engineering and mining engineering, in particular to a device and method for monitoring stress and displacement of surrounding rock in a roadway. Background technique [0002] In recent years, the scale of roadway and tunnel construction has become larger and larger, and the length has become longer and longer. Roadways and tunnels are hidden projects, and potential safety hazards are not easy to be discovered. At present, the existing tunnel stress and displacement monitoring methods at home and abroad are too simple to realize integrated monitoring, which requires a lot of manpower and material resources, coupled with the limitations of monitoring technology, monitoring level and the limitations of the instrument itself, there is an urgent need for a method that can A device that accurately monitors both stress and displacement simultaneously. [0003] Existing roadway surrounding rock stress monit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D21/02E21B47/06E21B47/00G01S17/08
Inventor 王宏伟肖博邓代新方婷婷
Owner CHINA UNIV OF MINING & TECH (BEIJING)