Heating constant-temperature device and method for high-temperature rock uniaxial compression test

Abstract

The invention discloses a heating constant-temperature device for a high-temperature rock uniaxial compression test. The heating constant-temperature device comprises a heating constant-temperature unit, a force transmission unit, a protection unit and a monitoring unit. The heating constant-temperature unit, the force transmission unit and the monitoring unit are arranged in the protection unit;the monitoring unit can be in contact with a standard cylindrical rock test piece, the heating constant-temperature unit and the force transmission unit, the force transmission unit is connected witha press machine to apply pressure to the standard cylindrical rock test piece, the heating constant-temperature unit can wrap the standard cylindrical rock test piece, and the force transmission unitis further communicated with the protection unit to conduct cooling. The device can be used in cooperation with a uniaxial press to simulate the influence of different temperature environments on themechanical property of a rock test piece, and has the remarkable advantages of being easy to operate, easy to control and high in test efficiency, can effectively avoid test errors caused by hydraulicoil invasion and test element temperature rise, and can conveniently and accurately obtain basic mechanical parameters of high-temperature rock.

Description

technical field [0001] The invention relates to the research fields of rock mechanics and deep rock mass engineering, in particular to a heating and constant temperature device and method for uniaxial compression tests of high-temperature rocks. Background technique [0002] Geothermal energy development and utilization, underground disposal of nuclear waste, deep mining of mineral resources and other projects all involve the mechanical behavior of rock mass in high temperature environment. Temperature is an important factor affecting the mechanical properties of rock mass, and the stress deformation and damage and fracture behavior of high-temperature rock mass directly affect the efficiency of resource development and the safety of underground structures, so it has attracted extensive attention from academia and engineering. [0003] Compared with normal temperature conditions, the mechanical behavior of high-temperature rock mass is usually more complicated. In the past, ...

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Problems solved by technology

[0003] Compared with normal temperature conditions, the mechanical behavior of high-temperature rock mass is usually more complicated. In the past, scholars at home and abroad mostly used indoor test methods to carry out basic research work on high-temperature rock specimens. At present, commonly used test devices include MTS, rock triaxial rheometer etc., the existing device can simulate the loading environment of the rock at high temperature, but the inventor believes that it still has many shortcomings or inconveniences, mainly including: (1) The heating of the test piece is usually carried out in a triaxial pressure chamber, and the test piece The steps of packaging, filling the pressure chamber with oil, and cooling the oil after the test are cumbersome, which greatly affects the test efficiency; (2) During the stress deformation and destruction of the test piece, high-temperature hydraulic oil easily penetrates into the test piece through the rubber film or heat-shrinkable tube. (3) The hydraulic oil is generally heated by resistance wire, and the heating area has a large influence range. The temperature rise of the triaxial pressure chamber and test components will affect the test accuracy and test safety.

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