Axial and radial integrated extensometer

Abstract

The present invention relates to an axial and radial integrated extensometer, four axial long strain gauges and four radial short strain gauges are connected to a square chassis by adopting the axialand radial integrated extensometer, each axial long strain gauge is provided with a pulley channel, each pulley channel is provided with a disc pulley capable of moving along the pulley channel, and an axial measuring bolt is arranged in the center of the disc pulley. When a test is carried out, the axial and radial integrated extensometer passes through a rock test piece through a hollow hole inthe middle of the square chassis, and the axial and radial integrated extensometer is fixed on the lower pressure head by using a fixing bolt on the side surface of the square chassis of the axial andradial integrated extensometer. An axial measuring bolt on an axial long strain gauge and a radial measuring bolt on a radial short strain gauge of the axial-radial integrated extensometer are rotated, so that the axial measuring bolt and the radial measuring bolt are respectively and firmly contacted with the upper pressure head and the middle part of the rock test piece. According to the invention, the operation steps of the extensometer are simplified, the experiment efficiency is improved, and the accuracy of measured data and the high efficiency of data transmission are improved.

Description

technical field [0001] The invention relates to the field of rock tests, in particular to an axial and radial integrated extensometer. Background technique [0002] With the development of the times, more and more large-scale geotechnical projects have been constructed and developed, and the research on rock mechanics has become more and more important. In the prior art, important parameters such as axial deformation and radial deformation obtained by testing a 50×100mm rock specimen in a rock hydraulic press with an extensometer are studied. [0003] The existing extensometer is composed of two parts, the axial extensometer and the radial extensometer. The two parts are respectively fixed on the lower pressing head by the fixing bolts on the side of the square chassis, so that the positioning screws at the head ends of the four short strain gauges of the radial extensometer are in contact with each other. In the middle part of the test piece, the four long strain gauge hea...

AI Technical Summary

Problems solved by technology

[0004] The existing extensometer has the following disadvantages: the existing extensometer fixes the axial and radial parts on the lower indenter respectively to ensure that the long strain gauge and the short strain gauge do not overlap and ensure that the transmission lines of the two parts are close to each other, so the loading operation is difficult. Extremely inconvenient; the existing extensometer measures the axial displacement by using the end of the long strain gauge of the axial extensometer to touch the conical disk fixed on the upper indenter, which is very affected by the conical disk, often because the conical disk is not installed properly. Insufficient balance and fixation lead to the axial extensometer end not being in good contact with the tapered flange, thus affecting the accuracy of the axial deformation data

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