Pull-out test device for simulating anchor rods in deep strata and test method of pull-out test device

Abstract

The invention provides a pull-out test device for simulating anchor rods in deep strata and a test method of the pull-out test device. The pull-out test device comprises a pressure supply mechanism, aseepage supply mechanism and a pull-out mechanism. A rubber water bag is used for packaging and squeezing concrete to simulate surrounding rock pressure in a roadway at a certain temperature, seepagewater in a seepage pressure storage tank is used for simulating seepage pressure in the roadway, a jack of a hollow plunger is used for pulling the anchor rods to simulate pulling force borne by theanchor rods in an anchor rod supporting mode, in the process, the pulling distance is measured by an axial displacement measuring device, the pulling force exerted by the jack of the hollow plunger isrecorded by a pressure sensor, the pulling distance is measured by the axial displacement measuring device, and the stress-strain of the anchor rods in the pulling process is recorded by a fiber bragg grating strain sensor. The pull-out test device for simulating the anchor rods in the deep strata and the test method of the pull-out test device can provide corresponding and accurate theoretical basis for the supporting design of deep underground tunnels.

Description

technical field [0001] The invention belongs to the technical field of mine simulation equipment, and in particular relates to a simulated deep formation bolt pulling test device and a test method. Background technique [0002] As coal mines are gradually mined deeper, under the influence of high ground stress, high ground temperature and high seepage, or "three highs", deep underground roadways appear a large number of roadways such as: roadways with soft expansive surrounding rocks, roadways with broken surrounding rocks, roadways affected by ground temperature and groundwater and other complex and difficult roadways, these complex and difficult roadways need to be supported before operation; since the anchor support system was applied to mine roadway support, it has obtained engineering technology due to its advantages of fast, efficient, less space and location, and economy The recognition of personnel has been widely used in geotechnical engineering such as mines, tunne...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application number: 201410813728.6 "Anchoring Material High Temperature Drawing Experimental Device and Experimental Method" discloses an anchoring material high temperature drawing experimental device and its experimental method. This patent application can realize the drawing experiment of anchoring material at high temperature, but The technical scheme adopted by it only simulates the pull-out test under the influence of temperature, and there is a certain gap with the real deep formation under the influence of "three highs" when the bolt and anchor are pulled out, and it cannot truly simulate the real "three highs" environment. The bolt pullout test situation

[0005] The published academic papers "The Effect of Water and Temperature on the Anchor Force of Resin Anchor" and "Research on the Mechanical Properties of Resin Anchor Agent for Full-length Prestressed Anchor" focus on the pull-out test of anchor bolts under the action of temperature and water. , but the effects of temperature and water on bolt anchorage are studied separately, and it does not reflect the effect of confining pressure on the anchor

Moreover, in the test of the influence of temperature on the anchorage of resin anchors, the temperature control is not accurate

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