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A rock triaxial tensile test specimen set device and manufacturing method thereof

A technology for rock specimens and tensile tests, which is applied in the direction of measuring devices, test sample preparation, sampling, etc., can solve the problems of direct tensile test difficulties, high processing costs, low yield, etc., to overcome the end effect and stress concentration effects, reduce the difficulty of processing and molding, and reduce the effect of production costs

Active Publication Date: 2021-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large-scale application of the direct method is limited due to the high requirements for processing technology, low yield and high processing cost of this "dog-bone"-shaped specimen.
Therefore, it is more difficult to conduct direct tensile tests on rocks under more complex three-dimensional stress states.

Method used

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  • A rock triaxial tensile test specimen set device and manufacturing method thereof
  • A rock triaxial tensile test specimen set device and manufacturing method thereof
  • A rock triaxial tensile test specimen set device and manufacturing method thereof

Examples

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Embodiment 1

[0032] Aiming at the existing problems, the present invention provides a rock triaxial tensile test component device and its manufacturing method. Compared with the prior art, the device and method overcome the end effect and the influence of stress concentration, and ensure that the middle part of the test piece is Tensile fracture, improve the success rate of the test and obtain the real direct tensile strength and ultimate strain value of the rock.

[0033] like Figure 1~4 As shown, the embodiment of the present invention provides a rock triaxial tensile test specimen assembly device, comprising a rock specimen 1, a rigid bonding head 4 and an oil-proof protective layer 7, wherein the two ends of the rock specimen 1 pass through Viscose 6 is bonded to the rigid bonding head 4, and the oil-proof protective layer 7 is sleeved on the outside of the rock test piece 1 and the rigid bonding head 4 and is in close contact with the outside of the rock test piece 1 and the rigid bo...

Embodiment 2

[0042] The present invention also provides a method for manufacturing a rock triaxial tensile test assembly, wherein the rock triaxial tensile test assembly is the test assembly described in Embodiment 1, which will not be repeated here.

[0043] The processing machine used in the processing method of the cylindrical rock block specimen is a CNC double-head engraving machine;

[0044] Further, the CNC double-head engraving machine is compatible with CAD / CAM software, and can carry out precise and automatic control cutting of rocks according to the designed shape;

[0045] Furthermore, the small tool diameter of 1mm used in processing can complete the precise milling of larger rock specimens;

[0046] The concrete manufacturing method of described test assembly comprises steps:

[0047] 1) Fix the upper and lower ends of the rock sample and one side of the symmetrical platform on the Jingdiao platform, use a double-headed tool to process symmetrically on both sides at the same...

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Abstract

The invention belongs to the field of testing devices and methods for rock mechanical properties, and in particular relates to a rock triaxial tensile test specimen set device and a manufacturing method thereof. A rock triaxial tensile test specimen assembly device, including a platform cylindrical rock specimen, a rigid bonding head and an oil-proof protective layer, wherein the two ends of the rock specimen assembly are bonded to the rigid bonding head through glue, The oil-proof protective layer is set on the outside of the rock test piece and the rigid bonding head and is in close contact with the outside of the rock test piece and the rigid bonding head. The cylindrical rock test piece of the platform includes a cylindrical main body, which is symmetrical on both sides A cutting platform with a certain depth and a smooth transition zone that smoothly transitions to the upper and lower ends of the cutting platform. The test component for rock mechanical performance testing provided by the invention and the manufacturing method thereof overcome the end effect and the influence of stress concentration, ensure tensile fracture in the middle of the test piece, and improve the success rate of the test.

Description

technical field [0001] The invention relates to the field of rock mechanical performance test devices and methods, in particular to a rock triaxial tensile test specimen set device and a manufacturing method thereof. Background technique [0002] The tensile strength of brittle materials such as rocks is much lower than the compressive strength, and tensile failure is one of the main failure modes of rocks. The tensile strength of brittle materials such as rocks and concrete in actual engineering construction is a basic parameter that must be mastered. During the excavation and construction of underground rock mass engineering such as tunnels, roadways, chambers, etc., the underground rock mass will generate tensile stress due to the unloading effect of excavation, and the surrounding rock of the structure often suffers tensile instability failure, which usually manifests as local Accidents such as roof caving, slabs and even landslides not only affect the progress of the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/44
CPCG01N1/28G01N1/286G01N1/44
Inventor 马春德刘泽霖郭春志龙珊谢伟斌周亚楠
Owner CENT SOUTH UNIV
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