Micro-crack triaxial stress seepage grouting test system and using method thereof

Abstract

The invention discloses a micro-crack triaxial stress seepage grouting test system and a using method thereof, and belongs to the field of machines. A technical defect that the whole seepage process of a micro-crack cannot be monitored in real time due to difficult direct observation of the dynamic change process of the micro-crack in test systems in the prior art is solved. The test system comprises a micro-crack triaxial stress seepage grouting experimental platform, a seepage grouting injection system, a liquid discharging pump, a first axial pressure liquid inlet pump, a confining pressureoil pump and a second axial pressure liquid inlet pump, the micro-crack triaxial stress seepage grouting experimental platform comprises a micro-crack triaxial stress seepage grouting experimental sealing device, a micro-crack triaxial stress seepage grouting experimental supporting platform and a pulling engineering oil cylinder, a grating fiber sensor binding post is arranged at the left end ofthe micro-crack triaxial stress seepage grouting experimental sealing device, and an acoustic emission sensor binding post is arranged at the right end of the micro-crack triaxial stress seepage grouting experimental sealing device. The test system can realize the dynamic real-time monitoring of the seepage grouting process of a sample under high axial pressure and high confining pressure conditions.

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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