A water-coolable rock multi-field coupling test comprehensive loading device and method

Abstract

The invention relates to a water-cooled rock multi-field coupling test comprehensive loading device and method. The device comprises an outer box; a hearth of which the outer surface is close to the inner surface of the outer box is arranged in the outer box; the internal space of the hearth is communicated with one end of a cooling liquid inlet pipe and one end of a cooling liquid outlet pipe; the other end of the cooling liquid inlet pipe and the other end of the cooling liquid outlet pipe are communicated with the external space of the outer box; a shaft-hydraulic pressure loading mechanismthat can move up and down penetrates through the tops of the outer box and the hearth; a water injection passage is formed in the shaft-hydraulic pressure loading mechanism, and used for injecting water into a rock test piece; a carrying mechanism is fixed at the bottom in the hearth; a heating element is installed in the hearth, and used for heating the rock test piece in the hearth. By using the loading device provided by the invention to conduct the test of the rock test piece, the test result is accurate and the test efficiency is higher.

Description

technical field [0001] The invention relates to a water-coolable rock multi-field coupling test comprehensive loading device and method. Background technique [0002] The development and utilization of hot dry rock is of great significance to solve the energy shortage, improve the ecological environment, and promote the sustainable development of society. The development and utilization of hot dry rock involves the coupling of deep formation stress field, seepage field and temperature field, and the mechanical properties and fracture behavior of deep rock mass under the coupling conditions of heat-fluid-solid multi-field directly affect the development and utilization efficiency of hot dry rock. And the success or failure of reservoir transformation. [0003] Due to the extremely complex fracture mechanical behavior of rock mass under thermal-fluid-solid multi-field coupling conditions, laboratory experiments are usually used to carry out basic research on mechanical proper...

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Problems solved by technology

Existing test equipment can simulate the loading environment of high temperature, high pressure and pore water pressure, but the inventors found that there are still some deficiencies, mainly including: 1) When using the existing equipment to carry out the water-cooled degradation test of high-temperature rock mass, it is usually necessary to remove the high-temperature specimen from Take it out of the heating device and put it in water to cool it. During this process, the heat loss caused by air convection and the change of rock properties are difficult to estimate, which will bring a certain degree of error to the test results; 2) Most of the existing devices use resistance wires to heat hydraulic oil. Due to the long oil temperature cooling and oil discharge time, the test efficiency is greatly restricted; 3) Most of the existing devices have relatively single functions, which can only simulate axial compression and triaxial loading in a coupling environment, and cannot achieve tensile strength. Test functions such as strength and hydraulic fracturing

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