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Method for analyzing force transmission of anchor rod

An analysis method and bolt technology, applied in the direction of analyzing materials, using stable tension/compression to test the strength of materials, measuring devices, etc., can solve the unclear force transmission mechanism of the anchoring system, the influence of model simplification, the anchor bolt experimental model and Analytical methods are not comprehensive enough

Inactive Publication Date: 2018-03-30
MCC COMM CONSTR GRP CO LTD +1
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Problems solved by technology

[0003] In view of the above-mentioned problems, the purpose of the present invention is to provide a method for analyzing the force transmission of anchor bolts, to solve the problem that the experimental model and analysis method of anchor bolts in the prior art are not comprehensive enough, the force transmission mechanism of the anchorage system is unclear, and the influence of model simplification on the experimental results And other issues

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  • Method for analyzing force transmission of anchor rod
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  • Method for analyzing force transmission of anchor rod

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Embodiment Construction

[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] A kind of bolt force transmission analysis method, concrete implementation method is as follows:

[0035] (1) Material parameters: Anchor rod 1 is made of HRB400 rebar with a length of 1.2m and a diameter of 25mm. The modulus of elasticity is 2.05×105MPa, Poisson’s ratio is 0.3, and the anchorage length is 500mm. Surrounding rock model 2 is simulated by concrete with a mass ratio of cement: sand: crushed stone of 1:1.65:3.25. The compressive strength is 48.5MPa, the elastic modulus is 3.25×104MPa, and the Poisson’s ratio is 0.23; Anchoring agent 3 has a compressive strength of 68.5MPa, an elastic modulus of 1.8×104MPa, and a Poisson’s ratio of 0.27.

[0036] (2) Model making of anchorage system:

[0037] ① Production of surrounding rock model 2: pour concrete into a semicircular steel cylinder mold with an inner diameter of 350mm and ...

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Abstract

The invention provides a method for analyzing the force transmission of an anchor rod. The method comprises the following steps: taking the anchor rod, simulating the material of surrounding rocks tomake a surrounding rock model with the axial through hole diameter being more than the diameter of the anchor rod, wherein the surrounding rock model is a semi-cylinder; bonding and fixing the anchorrod to the axial through hole of the surrounding rock model through an anchoring agent to make an anchoring system model; carrying out a pulling experiment on the anchoring system model, and acquiringthe anchor rod deformation data in the anchor rod pulling process by a strain gauge; carrying out grading loading on the anchoring system model through adopting a pulling instrument, recording the pulling force and the strain value of the anchor rod after the load value of every grade loading is stable, and repeating the above process until anchoring is invalid; and analyzing obtained experimentdata by using a digital speckle correlation technology to obtain the force transmission rule of the interface of the anchoring system and the gradient change rule of the vertical stress of the upper interface and the lower interface of the anchoring agent. The method completes traditional anchor rod pulling experiment models and analysis methods, and finely researches the mutual relation among theanchor rod, the anchoring agent and the interface force and the force transmission rule of the anchoring system.

Description

technical field [0001] The invention relates to the technical fields of safety protection of geotechnical engineering such as mining, water conservancy and hydropower, and transportation, and more specifically, relates to a more refined method for analyzing force transmission of bolts. Background technique [0002] The reliability of the bolt is the key to the safety protection of geotechnical engineering. The bolt anchoring technology has been widely used in mining, water conservancy and hydropower, transportation and other fields, and has achieved good economic and social benefits. As one of the core issues of bolt anchorage technology, the force transmission law of anchorage system is still immature. figure 1 It is a traditional cylinder pullout test model, which cannot monitor the deformation evolution characteristics of the anchorage system during the bolt pullout process. figure 2 It is a traditional analysis model of the force transmission law of the anchorage syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0075G01N2203/0647G01N2203/0676
Inventor 肖剑许海亮耿彦生宋义敏崔光耀刘彦军冷铁松
Owner MCC COMM CONSTR GRP CO LTD
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