Direct shear-seepage test device and test method for single fracture rock specimen under hydrostatic pressure condition

Abstract

The invention belongs to the field of rocks and rock mass mechanics and discloses a direct shear-seepage test device and test method for a single fracture rock specimen under a hydrostatic pressure condition. The device is characterized by comprising a loading system, an acoustic emission monitoring system, a seal system, a data acquisition system and a rock specimen pre-treatment system. By the direct shear-seepage test device and the test method, hydrostatic pressure packaging and direct shear-seepage testing of the single fracture rock specimen under high shear displacement and high seepagepressure conditions can be realized, friction fracture changes of a fracture face in a shearing process can be monitored in real time through the acoustic emission monitoring system, fracture face changes of the single fracture rock specimen before and after direct shear-seepage testing can be analyzed through a fracture face data processing system, deeply analyzing a direct shear-seepage mechanism and exploring main factors having effects on direct shear-seepage characteristics of single fracture rock can be realized, and a theoretical foundation and a test basis are provided for a shear-seepage instability mechanism of mining-induced fracture rock under the action of underground water.

Description

technical field [0001] The invention discloses a single-crack rock test piece direct shear-seepage test device and test method under hydrostatic pressure conditions, which belong to the field of rock and rock mechanics, and in particular relate to a single-crack rock test piece preparation technology with simple processing and few sealing links And a variety of supporting systems, such as acoustic emission monitoring system, fracture surface data processing system and data acquisition system, etc., can conduct direct shear-seepage tests on single-fracture rock specimens under hydrostatic pressure encapsulation, large shear displacement and high seepage pressure , can deeply analyze the direct shear-seepage mechanism of single-fracture rock, explore the main factors affecting the direct shear-seepage characteristics of single-fracture rock, and provide experimental and theoretical basis for underground rock engineering. Background technique [0002] In underground engineering...

AI Technical Summary

Problems solved by technology

However, these existing joint shear test equipment have the following problems: 1. The sealing operation of the test equipment is cumbersome and the sealing effect is difficult to meet the requirements of the test; 2. These test techniques basically only consider the lateral sealing of the fractured rock mass However, the lateral pressure is neglected, which leads to a serious discrepancy between the stress state of the rock mass and the actual state of occurrence; Concentrated water injection on the end face, which is quite different from the real water movement in the rock

4. The shear displacement of the fractures is not very large, mainly because the larger the shear displacement, the worse the sealing performance of the fracture rock; 5. The penetration water head applied in the test is not very high, which cannot meet the requirements of the test, that is, It is impossible to study the shear-seepage coupling law of fractures under the action of high osmotic pressure; 6. There is no reliable monitoring equipment to monitor the direct shear-seepage process, and the direct shear-seepage characteristics are only estimated based on the variation of deformation and flow. too simple

7. At present, the acoustic emission detection equipment used in the triaxial pressure chamber cannot be directly pasted on the surface of the rock specimen. Most of them are pasted on the heat-shrinkable sleeve that wraps the rock specimen. However, the heat-shrinkable sleeve will affect the transmission of sound waves. , leading to unreliable monitoring results, and it is even more difficult to realize the damage monitoring problem under the stress-seepage coupling

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