Point load tester and point load testing method

Abstract

The invention provides a point load tester and a point load testing method. The point load tester comprises a bearing box which is used for placing and fixing a rock test block, wherein the bearing box comprises an upper plate, a lower plate and a side plate; the lower plate is connected with a bearing box main body through an elastic connection part; the elastic force of the elastic connection part is greater than the sum of the gravity of the rock test block and the lower plate, and the rock test block can move upward along the lower plate under the action of the elastic force of the elasticconnection part after the rock test block is put into the bearing box until the rock test block abuts against an upper tapered pressing head, so that the rock test block is fixed. According to the point load tester provided by the invention, the rock test block does not need to be manually grasped by hands in a point load testing process, so that the safety hidden dangers are eliminated, the convenience of operation is improved and manpower is saved; The upper plate and the side plate of the bearing box have an anti-splashing effect on the rock test block and the testing safety is enhanced; the possibility that small blocks formed by cracking the rock test block collapse and move for a long distance is also avoided, and the small blocks are convenient to splice and recover at a later period.

Description

technical field [0001] The invention relates to point load test equipment, in particular to a point load tester equipped with a sample fixing device and a point load test method. Background technique [0002] In order to obtain the uniaxial compressive strength of the rock, it is generally necessary to process the rock into a standard rock sample, and use a press to perform a compression test on the rock sample indoors. The process of processing standard rock samples will inevitably cause secondary damage to the original rock, for example: destroying the internal microstructure of the rock itself, thus affecting the accuracy of the test results to a certain extent. The point load test can test the rock test block without processing the original rock, which has certain advantages. [0003] Point load test is widely used in various engineering fields, such as mining engineering, civil engineering and geological engineering. Compared with the indoor rock mechanics test, the p...

AI Technical Summary

Problems solved by technology

[0008] 1. Complex structure and cumbersome operation

Using the clamping device disclosed in the patent CN201320808075.3 requires at least four connecting rods at the front, rear, left, and right to achieve the purpose of fixing the rock test block, and the structure is relatively complicated; and in order to clamp a rock test block, it may be necessary to adjust the backing plate connecting rod 4 times, and Left and right must be adjusted, if the adjustment position is not suitable, it will also affect the test results

Generally, point load tests will carry out hundreds or thousands of rock test block tests, and the connecting rod of the backing plate must be adjusted for each test, which virtually increases the test time

[0009] 2. Low security

Patent CN201320808075.3 only sets the clamping device on the left and right sides of the rock test block, but does not set the clamping device on the front and rear sides of the rock test block. Splashing and avalanche direction have great uncertainty, so after the rock test block is broken, the device cannot completely prevent the broken rock from falling from the front and rear sides and hurting people, especially for brittle rock test blocks

[0010] 3. Affect test results

The clamping pad in the clamping device disclosed in patent CN201320808075.3 clamps the rock test block from the left and right directions, but it is difficult to accurately evaluate and control the clamping force of the clamping pad on the rock test block. The clamping force of the rock test block virtually exerts a confining pressure on the rock test block. At this time, the mechanical parameter measured by the experimental device is not the uniaxial compressive strength, but the strength under a certain confining pressure.

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