High temperature rock sample strain and acoustic wave testing device and testing method

Abstract

The invention discloses a high-temperature rock sample strain and sound wave testing device and testing method. The device is mainly composed of a sound wave emitting end, an upper pressure bearing shaft, a corundum thimble, an upper displacement slide, a lower displacement slide, a heat insulation shell, a carbon fiber sleeve, and a rock sample. , lower bearing shaft, acoustic wave receiving end, lower copper electrode, perlite powder, temperature sensor, transformer, temperature-acoustic control box, oscilloscope, upper copper electrode, data acquisition and processing system. The method includes: (1) installing the device on the stroke of the uniaxial mechanical testing machine; (2) heating the rock sample; (3) performing a compression test; (4) the difference between the upper displacement slide and the lower displacement slide is is the axial strain value of the rock sample; (5) The sound wave is emitted from the sound wave transmitter, and is received by the sound wave receiver after passing through the rock sample, and the sound wave time difference of the rock sample is obtained; (6) Various data are collected and stored. The invention is reliable in principle, easy to operate, can obtain the mechanical parameters of rocks at high temperature in real time, and has broad market application prospects.

Description

technical field [0001] The invention relates to a high-temperature rock sample strain and acoustic wave testing device and testing method for a uniaxial mechanical testing machine in the fields of high-temperature rock mass geothermal development and oil-gas well engineering. Background technique [0002] Under high temperature conditions, due to the different thermal expansion of various mineral particles that make up the rock, micro-cracks will appear inside the rock, which will lead to the deterioration of the mechanical properties of the rock, which will cause the instability of the well wall of geothermal development wells or oil and gas wells, resulting in well collapse and other serious safety accidents. Therefore, it is of great practical significance to study the variation law of rock mechanical parameters at high temperature. [0003] Chinese patent CN205643032U discloses a uniaxial test device for the high temperature stability of asphalt mixture, which can simul...

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Problems solved by technology

[0003] Chinese patent CN205643032U discloses a uniaxial test device for the high temperature stability of asphalt mixture, which can simulate the temperature change process of the asphalt pavement from the road surface after being heated, but the research object of this device is asphalt, and can only obtain uniaxial shear resistance Intensity; Chinese patent CN104865137A and Chinese patent CN105092387A respectively disclose a test device for testing the uniaxial tensile mechanical properties of conductor materials in a high-temperature environment and an in-situ tensile testing system for high-temperature mechanical properties of small-sized monocrystalline silicon specimens. Both devices are subjected to tensile mechanical testing

Some of the existing rock uniaxial mechanics experimental devices cannot be heated, and some of them have a very limited heating temperature, which cannot test rock mechanical parameters at higher temperatures, and basically do not have the function of sound velocity testing

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