Method for measuring rock thermal coefficient of linear expansion by utilizing pressure tester

A technology of expansion coefficient and pressure test, applied in the direction of material thermal expansion coefficient, etc., can solve the problem of reducing the time cost of rock thermal expansion coefficient measurement, and achieve the effect of convenient measurement, accuracy and precision.

Active Publication Date: 2015-07-01
GUANGXI UNIV
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Problems solved by technology

[0005] For above-mentioned existing problems, the object of the present invention is to provide a kind of method that utilizes pressure testing machine to measure rock thermal expansion coefficient, solve the above-mentioned problem and defici...

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  • Method for measuring rock thermal coefficient of linear expansion by utilizing pressure tester
  • Method for measuring rock thermal coefficient of linear expansion by utilizing pressure tester
  • Method for measuring rock thermal coefficient of linear expansion by utilizing pressure tester

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Embodiment 1

[0046] A method for measuring the coefficient of thermal expansion of rocks using a pressure testing machine comprises the following steps in sequence:

[0047] (1) Rock sample processing: select a cylindrical granite sample 3 with a section diameter of 50 mm and a height of 100 mm; drill a circular hole 8 with a depth of 35 mm and a diameter of 3 mm at the axis of the top surface of the granite sample 3, and A lead groove 9 with a width and a depth of 3mm is radiated from the center of the surface axis to the edge;

[0048] (2) Install the heating device of the silicone heater: paste the silicone heater 4 around the side of the granite sample 3, and wrap it with glass fiber tape to fix it. The silicone heater 4 is connected to the silicone heater temperature controller 14 through the silicone heater wire 13 ;Fix the temperature control thermocouple sensor 6 at a height of 65 mm from the bottom of the sample with glass fiber tape, the lower end of the temperature control therm...

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Abstract

The invention relates to a method for measuring rock thermal coefficient of linear expansion by utilizing a pressure tester. The method comprises the following steps of selecting a rock sample, drilling a circular hole and engraving a wire leading groove; installing a silica gel heating element heating device; wrapping a heat preservation and insulation layer; installing an electric couple; placing the assembled rock sample onto a uniaxial pressure tester, putting heat preservation and insulation mats on the top surface and the bottom surface of the rock sample; starting the uniaxial pressure tester to apply an initial load on the rock sample; setting finishing temperature required to be applied, recording a finishing load value and axis finishing temperature after a system is stabilized; finally, calculating the thermal coefficient of linear expansion. The invention utilizes the common pressure tester to measure the rock thermal coefficient of linear expansion, so that compared with other existing methods, the time required for single measuring can be well shortened, the problem of cooling of heating equipment does not need to be considered, the measurement of the next sample can be carried out directly, and high-efficient measurement of the rock thermal coefficient of linear expansion in engineering design is realized.

Description

technical field [0001] The invention relates to the technical field of thermal linear expansion coefficient measurement in rock mechanics tests, and more particularly relates to a method for measuring the thermal linear expansion coefficient of rock by using a pressure testing machine. Background technique [0002] The thermophysical properties of rocks have important theoretical and practical significance in deep tunnels, engineering construction in abnormal geothermal areas, nuclear waste treatment, geothermal development, deep coal mining, and stone cultural relics protection. Moreover, with the continuous development of underground engineering, problems related to rock thermodynamics are constantly emerging. For example, every 1°C change in temperature can produce a change in ground stress of 0.4-0.5 MPa. Therefore, the research on the evolution law of the mechanical properties of rock materials under the action of temperature field becomes extremely important. Among th...

Claims

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Application Information

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IPC IPC(8): G01N25/16
Inventor 苏国韶彭立锋邹亚峰秦子华胡小川鲁和
Owner GUANGXI UNIV
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