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Test method for performing rock direct stretching by using axial centering positioning device

A centering positioning and test method technology, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., to achieve the effects of broad application prospects, significant economic benefits, and convenient loading and unloading

Active Publication Date: 2013-09-25
SHANDONG UNIV
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Problems solved by technology

[0012] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a test method for directly stretching rocks using an axial centering device. Accepting the eccentricity problem when pulling, the test method can not only accurately test the tensile strength of the rock, but also effectively test the ultimate tensile strain and tensile stress-strain curve of the rock

Method used

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  • Test method for performing rock direct stretching by using axial centering positioning device
  • Test method for performing rock direct stretching by using axial centering positioning device
  • Test method for performing rock direct stretching by using axial centering positioning device

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046] figure 1 Among them, the adhesive centering positioning device is mainly composed of column 1, upper and lower positioning sleeves 2, 6, specimen clamping sleeve 3, valve supporting plate 4, specimen supporting plate 5, bottom plate 7, rotating handwheel 8, upper The pull-down head adjustment knob 9,16, the upper and lower pull-down head positioning rings 10,17, the upper and lower pull-down heads 11,15, and the wedge-shaped clamping valve 14 constitute.

[0047] The specimen clamping sleeve 3 and the wedge-shaped clamping valve 14 (Fig. 2(a), Fig. 2(b)) are the core components. When the rock specimen 13 is bonded, it can ensure that the center line of the specimen 13 is in line with the vertical direction. The centerlines of the heads 11 and 15 coincide to eliminate the eccentricity caused by bonding the test piece 13 . Wherein the inner surfa...

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Abstract

The invention discloses a test method for performing rock direct stretching by using an axial centering positioning device. The positioning device comprises an adhesion centering positioning device and a stretching centering positioning device which are matched with each other. The adhesion centering positioning device is used for eliminating the eccentricity caused by the adhesion of a test piece; the stretching centering positioning device is used for eliminating the eccentricity generated in the test piece stretching process; the tensile strength and the ultimate tensile strain and a tensile stress-strain curve of a rock can be accurately tested by using a direct stretching test method. The device is simple in structure, convenient to operate and easy to assemble and disassemble; the problem about the eccentricity when the rock test piece is adhered and stretched is solved; the test method can accurately test the tensile strength of the rock and also can effectively test the ultimate tensile strain and the tensile stress-strain curve of the rock.

Description

technical field [0001] The invention relates to a rock tensile test technology, in particular to a test method for direct rock stretching by using an axial centering positioning device. Background technique [0002] At present, the stress state of underground engineering rock mass is often very complicated. Some parts are in a state of compressive stress, while others are in a state of tensile stress. The failure mode of rock mass is not only shear failure, but sometimes tensile failure Or tensile shear failure, which requires testing the mechanical deformation and failure characteristics of rocks under tensile conditions. Since the most notable characteristic of rock materials is that the tensile strength is much smaller than the compressive strength, the failure of surrounding rock often starts from the tensile stress area, and then tensile failure or tensile shear failure occurs. Therefore, it is of great theoretical significance and engineering application value to stud...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/08
Inventor 张强勇张绪涛向文王超袁圣渤王有法
Owner SHANDONG UNIV
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