Sealing mechanism for rock mass shearing and seepage test and method thereof

Abstract

The invention discloses a sealing mechanism for a rock mass shearing and seepage test and a method thereof and relates to the technical field of rock mechanics tests. The sealing mechanism comprises a rock mass shearing and seepage test device which is composed of a rock sample, shearing plates, normal pressing plates, a confining pressure tracking pump, a computer and a confining pressure chamber; a sealing gum sleeve, a deforming capsule and a deforming separating plate are arranged on the sealing mechanism; and the sealing gum sleeve is used for fully covering the rock sample and covering the inserted parts of two shearing plates and two normal pressing plates, so as to realize the sealing between the seepage fluid and the outside. The method comprises the following steps: (1) assembling the sealing mechanism; (2) combining the accessories; (3) balancing the confining pressure and the pressure in the deforming capsule; and (4) testing track and balancing the confining pressure. According to the invention, the confining pressure is isolated from the osmotic pressure by the sealing gum sleeve, so that the osmotic pressure of the injected fluid can reach 50MPa; the deforming capsule can be used for realizing the large displacement of the rock mass shearing and ensuring the excellent sealing property for the fluid; and the shearing and seepage test under the extreme environments, such as corrosive fluid and high-temperature fluid, can be completed.

Description

technical field [0001] The invention relates to rock mechanics test technology, in particular to a sealing mechanism and method for rock mass shear and seepage tests. Background technique [0002] The rock or rock mass shear-seepage test is one of the important research tests in rock mechanics. The structure of the test device is complex, and it is difficult to seal the fluid, and it is difficult to achieve the seal of the high-pressure fluid. In the current shear-seepage coupling research of rock mass, the osmotic pressure of seepage fluid is highly required, and the existing rock mass shear-seepage test device cannot meet the requirement of osmotic pressure as high as 10 MPa or more. Moreover, during the shearing process, a large shear displacement will occur after the rock mass is damaged, which will cause a large deformation of the sealing part, thereby increasing the sealing difficulty of the shear seepage test device. In recent years, in the basic research on the geol...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the high osmotic pressure sealing problem of the seepage fluid in the rock mass shear seepage test, and provide a sealing mechanism for the rock mass shear and seepage test on the basis of the confining pressure chamber of the true triaxial testing machine and its method; the specially designed sealing rubber sleeve can have good sealing performance for higher osmotic pressure, and there is no dead space to accurately measure the fluid volume injected into the rock sample

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