Device for measuring circumferential strain of rock specimen

Abstract

The invention relates to a device for measuring the circumferential strain of a rock specimen. The device comprises a first fixed seat and a second fixed seat, wherein the first and second fixed seats are arranged on the two sides of the surface of the upper part of the cylindrical rock specimen to be measured respectively; a cambered force bearing plate is arranged at the bottom of the side, close to the second fixed seat, of the first fixed seat, the second fixed seat is mounted on the force bearing plate, and the first and second fixed seats are fixedly connected through an elastic connecting piece; the first and second fixed seats are tightly hooped on the periphery of the rock specimen to be measured through a hooping band; a linear displacement sensor is mounted on the first fixed seat, a circular deformation displacement pushrod is fixed on the second fixed seat, the linear displacement sensor points to the circular deformation displacement pushrod, and the detection end of the linear displacement sensor is pressed against the end part of the circular deformation displacement pushrod; the linear displacement sensor is externally connected with a background computer. The device has the advantages of simple structure, convenience for mounting, capability of comprehensively measuring the radial deformation of a rock and relatively high accuracy of a measurement result.

Description

technical field [0001] The invention belongs to the technical field of rock measurement, in particular to a device for measuring the hoop strain of a rock sample. Background technique [0002] The basic mechanical properties of rock are the basis of various rock engineering, and the deformation performance of rock is one of the important parameters to evaluate the basic mechanical properties of rock. Therefore, in the experiments of various rock samples, the deformation of rock samples is often measured. Measurement. At present, the methods for measuring rock deformation mainly include dial gauge method, strain gauge method and the most popular LVDT displacement sensor measurement method at this stage. Among them, the dial gauge method is to fix one end of the dial gauge at a fixed position, and the other end touches the rock surface to measure the deformation of the rock. It has the disadvantages of low measurement accuracy, limited measurement range, and cannot be used f...

AI Technical Summary

Problems solved by technology

However, this method cannot be applied to the deformation measurement of rock samples in conventional triaxial tests due to the large space required for the bracket to fix the LVDT sensor.

In addition, since the LVDT sensor measurement method in this method can only measure the deformation at the contact surface between the rod armature of the LVDT sensor and the rock sample, it cannot comprehensively measure the deformation of the rock sample.

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