In-situ test device and method for surrounding rock strength of anchor rod supporting roadway
A technology of in-situ testing and bolt support, which is applied in the direction of measuring devices, strength characteristics, and the use of stable tension/pressure test material strength, etc., to achieve the effect of simple test steps, fast and accurate measurement, and guaranteed stability
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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, 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 anchor rod is suitable for installing the device, the appropriate round hole is selected on the base according to the row spacing of th...
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