System and method for testing rock damage and permeability under coupling effect of temperature stress and circumferential seepage

Abstract

The invention discloses a system for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The system comprises a frozen-heave force test device and a permeation test device, wherein the permeation test device comprises a pressure chamber for loading a rock test piece to be tested, a pressure loading device, a permeation pressure increasing and measuring device, a water bath heating device, an ultrasonic damage test device and a data acquisition device. The invention further discloses a method for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The method comprises the following steps: carrying out repeated freezing-thawing tests on a rock by the frozen-heave force test device, measuring the frozen-heave force change of the rock test piece, putting the rock into the pressure chamber, applying a pressure to the rock test piece by the pressure loading device, and testing a rock permeation coefficient k and ultrasonic wave speed transmission time t under the action of flowing liquid with different temperatures and pressures so as to make a research on rock damage and permeability.

Description

technical field [0001] The invention relates to a rock penetration testing device and a testing method, in particular to a rock damage and penetration testing system and testing method under the coupling action of temperature stress annular seepage flow. Background technique [0002] During the construction of underground tunnels in water-rich areas in cold regions, the surrounding rock stress field undergoes a secondary distribution under excavation disturbances, and there are problems affecting the surrounding rocks by temperature and seepage. influences. The evaluation and prediction of such problems requires in-depth exploration and research on the permeability and damage characteristics of rocks under complex coupling conditions. From the perspective of the combination of rock temperature, stress and seepage multi-field coupling and damage, it is better to fundamentally solve the problems encountered in engineering. [0003] The permeability coefficient of the rock ma...

AI Technical Summary

Problems solved by technology

At present, there are a lot of test equipment under coupling conditions, but there is no unified standard, and the test performance is uneven. A small part of the test equipment can be used by people generally, and most of the development is only limited to the research of specific problems.

Understand the test equipment that has been publicly introduced, involving temperature, stress, annular seepage, and the test device that can measure rock damage in real time has not been publicly reported

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