Rock fracture shear seepage test device and test method thereof

Abstract

The invention discloses a rock fracture shear seepage test device and a test method of the device and relates to the technical field of rock mechanical tests. The test device comprises an upper shearbox, a lower shear box, an upper shear ring and a lower shear cylinder, wherein a sealed small hole is formed in the lower shear cylinder and connected with a water supply pipeline to apply water pressure onto a rock sample. The test method comprises the steps of mounting a fracture sample in the upper shear ring and the lower shear cylinder by cement placement and plasticine isolation, wrapping the side face of the fracture sample with a rubber sleeve to avoid water leakage between the side face of the sample and the rubber sleeve, putting a combination of the upper shear ring and the lower shear cylinder in the lower shear box and the upper shear box, connecting with the water supply pipeline and a water collecting pipeline, measuring load, displacement and seepage quantity, and collecting measured data and drawing a form via a computer, wherein a water outlet is formed in the rubber sleeve. The device and the method are used for achieving the rock fracture shear seepage test, and studying the change in rock fracture seepage quantity in a shear process.

Description

technical field [0001] The invention relates to the technical field of rock mechanics tests, in particular to a rock fissure shear seepage test device and a test method thereof. Background technique [0002] In rock mass engineering, groundwater is one of the important factors affecting the stability of rock mass engineering. Rock mass is composed of rock blocks and fissures. Fissures are the main channels for water conduction. Occurs in rock fractures, so stress has an important impact on the permeability of fractured rock mass. Scholars at home and abroad have made some progress in the research on the influence of normal load and tangential load on the permeability of rock fractures, mainly using two methods: laboratory test and numerical simulation. [0003] At present, the shear seepage test mostly adopts the linear flow method, and the two sides of the crack of the sample are sealed with rubber bags, and the water enters and exits from the other two sides. This method...

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Problems solved by technology

This method has the following disadvantages: ①The lateral rubber bag is required to have greater elasticity, so that it cannot break and leak during the shearing process, and cannot generate excessive shear force; ②It needs to apply a large load to the rubber bag to make it contact with The rock samples are in close contact. When the load is low, the seal may not be good and cause lateral water leakage. When the load is large, when the upper and lower rock blocks of the sample produce relative shear displacement, the rubber bag may be damaged.

The radiation flow test does not require the sealing of the two sides of the crack. As long as water enters from the center of the hole and water exits from the crack, the single-crack rock radiation flow test can be realized. there is no mature way

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