Test auxiliary device for testing tensile strength of rock through Brazilian test

Abstract

The invention discloses a test auxiliary device for testing the tensile strength of rock through the Brazilian test, and relates to the technical field of rock mechanical tests. The test auxiliary device for testing the tensile strength of the rock through the Brazilian test comprises a base (1), a cushion block (2), an upper cushion strip (6), a lower cushion strip (7), stand columns (4), a locating frame (3) and springs (5). The test auxiliary device for testing the tensile strength of the rock through the Brazilian test is simple in structure and ingenious in design, the locating frame with the internal trapezoid hollow is designed to act on a cylindrical test piece through the cushion block, the test piece downwards moves into the locating frame along with the own gravity, the centering position of the test piece is regulated until the bottom of the test piece makes contact with the lower cushion strip to be stable, the automatic regulation of the position of the test piece is finished, manual regulation is not needed, although the locating frame makes contact with the test piece before the test and plays the leading function for adjusting the centering position, the acting force of the locating frame can be ignored relative to the acting force after the test begins, test data after locating is accurate are accurate, an error is small, assembly and disassembly are convenient, manual regulation is not needed, and testing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of rock mechanics tests, in particular to a test auxiliary device for testing the tensile strength of rocks by the Brazilian method. Background technique [0002] The tensile strength of rock refers to the ultimate stress value when a rock sample reaches failure under tension. The tensile strength of rock is much smaller than the compressive strength, so the tensile strength of rock is an indispensable and important parameter in rock drilling, blasting, underground engineering, etc. [0003] Rock tensile strength test methods can be divided into two categories: direct method and indirect method. The direct method is similar to the method used for metal testing. This kind of test requires that the holder does not damage the surface of the specimen, and the applied load should be strictly parallel to the axis of the specimen to avoid stress concentration caused by bending. Indirect method There are many ty...

AI Technical Summary

Problems solved by technology

[0005] The rock tensile strength measurement device (Figure 4-8) shown in the book "Rock Mechanics Test Course" edited by Fu Zhiliang, because the rock force surface is too large, will increase the test error; edited by Shen Mingrong, Chen Jianfeng, etc. The book "Rock Mechanics" shows us the simplest test device ( figure 2 -7), but because this device requires manual correction by the tester, the result is not very good and will cause large errors

[0006] The specimen fixture (CN101936851 A) developed by Yang Chunhe, Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences to measure the tensile strength of rock (CN101936851 A) has improved the test device and improved the test accuracy, but the structure of the fixture is more complicated, and due to the continuous Rod connection will indirectly affect test accuracy

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