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An in-situ test device and method for testing the strength of the surrounding rock of the roadway supported by bolts

A technology of in-situ testing and bolt support, which is applied in the direction of measuring device, strength characteristics, and testing the strength of materials by applying stable tension/pressure to achieve the effects of convenient measurement, little interference, and simple test steps.

Active Publication Date: 2021-08-06
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of accurately measuring the strength of the surrounding rock of the roadway, especially to adapt to the geological conditions of weak lithology, avoid the impact of drilling or water injection on the surrounding rock, and make the measurement closer to the relevant mechanical properties of the in-situ rock mass, the present invention provides a A kind of bolt support roadway surrounding rock strength in-situ test device and method, the specific technical scheme is as follows

Method used

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  • An in-situ test device and method for testing the strength of the surrounding rock of the roadway supported by bolts
  • An in-situ test device and method for testing the strength of the surrounding rock of the roadway supported by bolts
  • An in-situ test device and method for testing the strength of the surrounding rock of the roadway supported by bolts

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Embodiment 1

[0049]In order to provide a more accurate test, wider applicability, and less disturbance to the surrounding rock, an in-situ test device and test method for the strength of the surrounding rock of the coal mine roadway, especially to achieve accurate measurement under soft rock conditions, so that it can be effectively Guide roadway support design and surrounding rock stability analysis and research.

[0050] An in-situ test device for testing the strength of surrounding rock in a roadway supported by bolts specifically includes a fixing mechanism 1 , a loading mechanism 2 , a measuring mechanism 3 and a control system 4 . Among them, the fixed base of the fixing mechanism can be adjusted up and down with the fixing rod, so as to facilitate installation and measurement, and adapt to the construction conditions of different row spacing between anchor rods; the loading mechanism can realize stable automatic loading, ensuring the stability of loading, thereby reducing the The te...

Embodiment 2

[0065] On the basis of Embodiment 1, the operation method of the device will be further described in detail by taking the rock bolt support roadway of a certain mine as an example.

[0066] In the mine roadway, the anchor rod is made of 2.4m long rebar, and fast and slow anchoring agents are applied to the end and rear respectively. The top of the surrounding rock is supported by steel mesh + steel guard plate, and the two sides are supported by metal mesh. Arrange bolts along the entire vertical surface of the roadway, with rows and spacings of 900mm and 850mm, and 5 bolts in a row; 3 bolts are arranged in the surrounding rock with a spacing of 600mm.

[0067] The specific operation steps for carrying out the test include:

[0068] (1) Select the test area. Since the roof of the roadway in the mine is relatively flat, and the exposed end of the bolt is suitable for installing the device, the appropriate round hole is selected on the base according to the row spacing of the ...

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Abstract

An in-situ test device and method for testing the strength of surrounding rock in a roadway supported by bolts, relates to the technical fields of mining engineering and rock mechanics, and solves the technical problem of accurately measuring the strength of surrounding rock in a roadway. The test device includes a fixing mechanism, a loading mechanism, a measuring mechanism and a control system. The fixed base moves up and down along the fixed rod to facilitate installation and measurement; the loading mechanism includes a hydraulic pump and a plunger pump. The hydraulic pump drives the plunger pump to work and controls the loading. The lifting speed of the oil cylinder can adjust the speed of the die pressing into the surrounding rock; the measuring mechanism includes an infrared distance measuring unit and a wireless pressure monitoring unit, which continuously monitor and feed back the monitoring data to the control system; the control system controls the work of the loading mechanism and processes the monitoring data. The test device is directly installed in the roadway and fixed with the bolt. After leveling the device, it starts to be pressed in and loaded. After obtaining the monitoring data, the pressure is released and the device is disassembled to complete the in-situ test of the strength of the surrounding rock of the roadway supported by the bolt. The steps are simple and adaptable. Strong.

Description

technical field [0001] The invention relates to the field of mining engineering and measurement technology, in particular to an in-situ test device for the strength of surrounding rock in a roadway supported by bolts, and a test method using the device for testing. Background technique [0002] Rock mechanical parameters are an important basis for the design and selection of underground engineering support parameters, and the results directly determine the roadway support parameters of underground engineering. There are two commonly used determination methods for rock strength, namely indoor test and field in-situ test. In the laboratory test, samples are firstly taken in the well, drilled into cores, and then transported to the laboratory for determination of rock mechanics parameters. The in-situ test is a direct measurement on the premise that the secondary disturbance to the original rock is small, and the measurement is closer to the relevant mechanical properties of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/02G01N3/12
CPCG01N3/02G01N3/12G01N33/42
Inventor 于凤海杨学瑞谭云亮任强周凯张闯杜盼王庆铎
Owner SHANDONG UNIV OF SCI & TECH