Micro-crack triaxial stress seepage grouting test system and its application method

Abstract

Disclosed are a micro-fissure triaxial stress seepage grouting test system and a use method thereof. The test system comprises a micro-fissure triaxial stress seepage grouting experiment platform (1), a seepage grouting injection system (2), a liquid drainage pump (3), a first axial pressure liquid feeding pump (4), a confining pressure oil pump (5), and a second axial pressure liquid feeding pump (6). The micro-fissure triaxial stress seepage grouting experiment platform (1) comprises a micro-fissure triaxial stress seepage grouting experiment sealing device, a micro-fissure triaxial stress seepage grouting experiment support platform, and a pulling oil cylinder (8). A grating fiber optic sensor wiring column (9) is arranged at a left end of the micro-fissure triaxial stress seepage grouting experiment sealing device, and an acoustic emissions sensor wiring column (28) is arranged at a right end of the micro-fissure triaxial stress seepage grouting experiment sealing device. The test system dynamically monitors in real time the seepage grouting process of a sample under high axial pressure and high confining pressure and eliminates the technical defect of test systems in the prior art wherein difficulties in directly observing a dynamic change process of a micron-scale fissure means that the entire micro-fissure seepage process cannot be monitored in real time.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a micro-crack triaxial stress seepage grouting experiment system and a use method thereof. Background technique [0002] There is a large amount of water in the construction of underground engineering and water conservancy projects, and the high-pressure water is often unable to be effectively controlled, causing natural disasters. Through traditional grouting, larger openings can be effectively blocked, but some micro-cracks still leak water in the form of large-scale uniform sweat seepage. Sampling electron microscopy analysis shows that the sandstone seepage channel is a micro-crack with an opening of 0.03-0.1mm. In order to better control the disasters caused by micro-crack water in engineering, it is necessary to study the seepage law of micro-cracks. Obtain the stress and strain of the micro-crack surface along the seepage path under different triaxial stress conditio...

AI Technical Summary

Problems solved by technology

[0003] The seepage mechanism of micro-cracks is difficult to realize through test methods. The fundamental reason is that the opening of micro-cracks is very small, and traditional monitoring devices cannot meet its accuracy requirements.

Large-scale advanced detection equipment such as nuclear magnetic resonance and CT scanning are also difficult to directly observe the dynamic change process of micron-scale cracks, resulting in the inability to monitor the entire seepage process of micro-cracks in real time; It is a big challenge to ensure stable seepage and make the device airtight and watertight

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