Device and method for heating rock specimen under triaxial pressure

Abstract

The invention relates to a device and a method for heating a rock specimen under a triaxial pressure. The device consists of a triaxial pressure chamber furnace body, an axial pressure head, a confining pressure head, an upper pressure head, a lower pressure head, pressure-transmitting, heat-generating, insulating and heat insulation materials, a thermocouple, a traction trolley base, a triaxial pressure machine and a temperature control cabinet, wherein the triaxial pressure chamber furnace body is arranged on the traction trolley base; solid-particle pressure-transmitting materials, the thermocouple and heat-generating, insulating and heat insulation materials are arranged in a space encircled by the axial pressure head, the confining pressure head, the upper and lower pressure heads, the rock specimen and the inner wall of the triaxial pressure chamber furnace body; and water cooling copper pipes are distributed at the periphery of the triaxial pressure chamber furnace body. The triaxial pressure machine is used for pressurizing the axial pressure head and a confining pressure sleeve, adjusting the output current of the temperature control cabinet and changing the heat productivity of an electric heating alloy sheet; the heat passes through a piece of mica paper and is transmitted to the rock specimen; the thermocouple measures the ambient temperature of the electric heating alloy sheet in real time; and the temperature control cabinet displays and records the ambient temperature, compares the displayed temperature with the experimental fitted temperature, and adjusts the current to realize the controllable temperature of the rock specimen.

Description

technical field [0001] The invention relates to a rock sample heating device and method, in particular to a rock sample heating device and method suitable for rock triaxial tests, belonging to the field of rock mechanics engineering. Background technique [0002] With the development of human society and the rapid progress of science and technology, there are more and more temperature-related engineering problems, such as underground coal gasification, high-temperature rock mass geothermal development, deep oil and gas exploitation, and waste disposal. The coupling characteristics under the combined action of temperature, stress and fluid, and the solution of these problems cannot be separated from the development and progress of experimental technology, and cannot be separated from the development of testing machine technology. For example, the depth of oil drilling has reached 8000m, the depth of high-temperature rock mass geothermal resource exploitation is above 5000m, t...

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Problems solved by technology

[0004] At present, domestic and foreign rock mechanics laboratories mainly focus on small rock samples of Φ50x100mm. The pressure testing machine has a small stiffness, and there is a phenomenon of rebound after breaking in actual operation. At the same time, in the triaxial test, liquid is used to apply confining pressure. Does not have the conditions for high temperature and high pressure coupling

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