Indoor drawing-shearing two-dimensional test method and apparatus for anchor pole

Abstract

The invention discloses an indoor drawing-shearing two-dimensional test method and apparatus for an anchor pole. According to the invention, a plate-shaped sample and the anchor pole are bonded together by an anchoring agent so as to prepare an anchoring body sample; the anchoring body sample is placed on a lower bearing plate; certain initial vertical load is applied on the anchoring body sample; a backing plate and a locknut are successively mounted on the anchor pole; and an indoor drawing-shearing two-dimensional test of the anchor pole is carried out in a displacement control manner, and the situation of deformation and rupture of the anchoring agent and the plate-shaped sample and deformation and axial force distribution of the anchor pole can be observed in real time in the process of testing. The test method and apparatus provided by the invention are of important significance to acquisition of drawing-shearing failure test data of the anchor pole and understanding of the failure mechanism of an anchoring system under comprehensive drawing and shearing effect.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to an indoor tension-shear two-dimensional test method and device for a bolt. Background technique [0002] Bolt is the most widely used support method in anchoring projects in transportation, water conservancy and mining industries. The anchor rod and the rock mass are bonded together by the anchoring agent, and the anchoring system refers to the combination of the anchor rod, the anchoring agent and the rock mass within the effective range of the anchor rod. The revelation of the working mechanism of the anchorage system has always been a difficult problem in the field of anchorage mechanism research. The pull-out test is the main test method in the study of this problem. However, the traditional pull-out test method has the following two significant defects: (1) In engineering practice, the anchor rod is simultaneously subjected to tensile and shear ...

AI Technical Summary

Problems solved by technology

The pull-out test is the main test method in the study of this problem. However, the traditional pull-out test method has the following two significant defects: (1) In engineering practice, the anchor rod is simultaneously subjected to tensile and shear loads. Under the action of shear load, the anchorage system will exhibit mechanical behavior different from that under the action of pure tensile load, and the traditional pull-out test cannot meet the simultaneous application of tensile and shear loads; (2) The traditional pull-out test method In the process, the anchor rod is installed in the borehole through the anchoring agent. The anchor rod and the anchoring agent are surrounded by the borehole and are in a closed state. It is impossible to directly observe the deformation and cracking of the anchoring agent, the anchoring body, and the deformation process of the anchor rod during the drawing process.

Although this method overcomes the defect that the traditional airtight test method cannot directly observe the test process, this method can only study the work and failure mechanism of the anchorage system under the action of pure tensile load, and cannot realize the failure of the anchor rod under the combined tensile-shear load. Research on Mechanical Behavior under Action

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