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Bonding strength testing method for anchor rod

A technology of bonding strength and testing method, applied in the direction of measuring devices, instruments, mechanical devices, etc., to achieve the effect of accurate mechanical parameters

Active Publication Date: 2016-11-16
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uniform distribution of the shear stress on the bonded surface is realized by unfolding the anchor structure, which overcomes the technical problems such as uneven shear stress in the traditional anchor pull-out test, and can accurately obtain the mechanical parameters of the anchor under different conditions, providing reasonable support for underground engineering Design provides scientific basis

Method used

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  • Bonding strength testing method for anchor rod
  • Bonding strength testing method for anchor rod
  • Bonding strength testing method for anchor rod

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for testing the bond strength of anchor rods, comprising the following steps:

[0034] Take the bolt used in the project site, scan the surface of the bolt with a laser scanner, and obtain the topography data of the bolt surface;

[0035] The anchor rod surface topography data is transmitted to the 3D printer, and the mold 5 for making the anchor rod shear test piece 3 with the anchor rod surface topography is printed out by the 3D printer, such as Figure 5 shown;

[0036] The anchor shear test piece 3 is made with the mold 5 as a template. The anchor shear test piece 3 is in the shape of a cuboid as a whole, its upper surface has the same shape as the anchor surface, and the side and lower surfaces are smooth. The material used It is consistent with the material type of the bolt on the project site;

[0037] Using the anchor shear test piece 3 as a template, pouring anchor bonding material on the anchor shear test piece 3 to form a slurry layer 6; ...

Embodiment 2

[0041] Take a section of the anchor rod at the engineering site as the anchor rod test piece, roll the anchor rod test piece through the plastic material under the set pressure condition, and leave the surface morphology of the anchor rod on the surface of the plastic material;

[0042] Use the surface of the plastic material as a template to make the anchor shear test piece 3. The anchor shear test piece 3 is in the shape of a cuboid as a whole, its upper surface has the same shape as the anchor surface, and the side and lower surfaces are smooth surfaces. , the material used is consistent with the material type of the anchor bolt on the project site;

[0043] Using the anchor shear test piece 3 as a template, pouring anchor bonding material on the anchor shear test piece 3 to form a slurry layer 6;

[0044] The above-mentioned bolt shear test piece 3 and the slurry layer 6 together form the bolt shear assembly 4, and the bolt shear assembly 4 is installed on the shea...

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Abstract

The invention relates to a bonding strength testing method for an anchor rod. The bonding strength testing method comprises the following steps: step 1, manufacturing an anchor rod simulator with the surface appearance of the anchor rod; step 2, pouring a grouting material on the anchor rod simulator to form a slurry layer; step 3, performing a shearing test to obtain mechanical parameters reflecting the bonding strength between surrounding rock and an anchor body. According to the bonding strength testing method, the anchoring structure is spread to realize uniform distribution of the shearing strength on a bonding surface, the technical problems of nonuniform shearing strength transfer and the like in a traditional anchor rod pull-out test, and the mechanical parameters of the anchor body under different conditions can be accurately acquired to provide scientific references for reasonable supporting designs of underground constructions.

Description

technical field [0001] The invention relates to the technical field of underground engineering support, in particular to a method for testing the bonding strength of anchor rods. Background technique [0002] Anchor is one of the main support forms of underground engineering and slope engineering, and it is a tension member that goes deep into the ground. The technology is to drill holes in the rock or soil layer, bury the anchor rods in the drill holes, and then pour grout into the drill holes to fix the anchor rods on the rock (soil) layer of the slope or tunnel. In order to restrain the deformation and failure of the rock (soil) layer, play a supporting role. The main cause of anchor failure is the failure of the bond between the anchor body and the grouting body. It is extremely important to reasonably determine the bond strength between the anchor and the grout for the structural design of the anchor. [0003] In order to test the bond strength of anchor bolts, the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 蒋宇静吴学震王刚王琦李树忱蔡跃
Owner SHANDONG UNIV OF SCI & TECH
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