Indoor testing apparatus for thermal expansion coefficient of rock sample

Abstract

The invention relates to a testing apparatus for the thermal expansion coefficient of a rock sample, which belongs to the field of test instruments. The testing apparatus comprises a pedestal, an oil delivery channel, a furnace wall, a top cover, an electrical bar and a strain rod, wherein the furnace wall is hollow, an objective table is arranged on the pedestal, the pedestal is in fixed connection with the lower end surface of the furnace wall through a fastening screw, the upper end of the furnace wall is provided with the top cover, the top cover is provided with the electrical bar, and the lower end of the electrical bar is placed in a furnace chamber. The testing apparatus provided by the invention employs an assembling connection structure and a built-in oil heating mode, uniform heating of a to-be-tested rock sample can be realized through usage of the built-in oil heating mode, and since the strain rod is provided with a matching high precision strain gage, axial expansion strain of the to-be-tested rock sample after heating can be sensitively measured. The testing apparatus has the advantages of a reasonable structure, convenience in assembling connection, simple operation and capacity of measuring the thermal expansion coefficient of a rock; the built-in oil heating mode enables a high heating temperature to be obtained; and the high precision strain gage is cooperatively used for the testing apparatus, which facilitates measurement of the thermal expansion coefficient of the rock and enables high test precision to be obtained.

Description

technical field [0001] The invention relates to a rock thermal expansion coefficient testing device, which belongs to the category of testing instruments. Background technique [0002] With the continuous development of the field of geotechnical engineering, more and more projects involve the thermal-solid coupling problem of rock and soil. Therefore, it is particularly important to consider the evolution law of mechanical properties of rock under the action of temperature. However, to determine the mechanical parameters under the action of temperature, the thermal expansion coefficient of the rock is an indispensable parameter. At present, most of the devices used to test the thermal expansion coefficient of rocks are not suitable for measuring the thermal expansion coefficient of rocks. Some use non-contact measurement methods, using optical signal measurement, and the principle is complicated; the use of some instruments requires two samples for comparison. , In the meas...

AI Technical Summary

Problems solved by technology

At present, most of the devices used to test the thermal expansion coefficient of rocks are not suitable for measuring the thermal expansion coefficient of rocks. Some use non-contact measurement methods, using optical signal measurement, and the principle is complicated; the use of some instruments requires two samples for comparison. , during the measurement process, the human error is large

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