A reciprocating rock fracture friction-seepage characteristic testing device and testing method

Abstract

The invention discloses a reciprocating rock crack friction-seepage characteristic testing device and testing method. The testing device includes an X-axis shear system, a Y-axis stress loading system, a Z-axis stress loading system, a servo oil source system, and a pore pressure loading system. and host; X-axis shearing system includes X-axis EDC controller, upper shear box, lower shear box, X-axis left hydraulic cylinder, X-axis right hydraulic cylinder, X-axis left pressure head, X-axis right pressure head, X-axis Axis left pressure sensor, X-axis right pressure sensor and X-axis displacement sensor; pore pressure loading system includes gas cylinder, pressure gauge, pressure reducing valve, fluid inlet pipeline, fluid outlet pipeline and flow meter. The invention can efficiently and accurately measure the friction coefficient in the sliding process, the stability parameters of the fracture surface and the permeability, realize the simultaneous measurement of the friction characteristics of rock fractures and the evolution law of fracture permeability, and can simultaneously characterize the mechanical properties and characteristics of rock fractures. Seepage (hydraulic) properties.

Description

technical field [0001] The invention relates to the field of rock mass mechanics and engineering experiments, in particular to a reciprocating rock crack friction-seepage characteristic testing device and a testing method. Background technique [0002] Human activities related to water injection, such as oil and gas and geothermal energy development, sewage re-injection, may induce seismic activity and disaster risks. A large amount of high-pressure fluid is injected into the formation, which changes the in-situ stress field of the reservoir and reduces the effective stress originally acting on the faults and fractures, which may cause the slip of faults and fractures, resulting in seismic phenomena. The slip stability of faults and fracture surfaces will directly determine whether the slip is stable creep slip or unstable seismic slip, and the slip process will also lead to changes in the permeability of the surrounding rock mass. Similarly, there are similar engineering p...

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Problems solved by technology

[0003] (1) The existing rock inclined shear instrument cannot simulate the triaxial stress state of the deep rock, and cannot accurately measure the friction characteristics of the rock fracture surface under the stress condition

[0004] (2) The measurement of the friction coefficient of rock fractures in the existing laboratory experiments mostly adopts the oblique shear method. During the sliding process of the oblique shear fracture, the stress concentration phenomenon caused by the end loading is difficult to ensure that the fracture slides along the direction of the fracture surface, making the upper and lower fracture surfaces Can not be fully contacted, resulting in inaccurate measurement results

[0005] (3) Existing test devices cannot simultaneously measure the friction characteristics of rock fractures and the evolution law of fracture permeability, and cannot simultaneously characterize the mechanical properties and seepage (hydraulic) characteristics of rock fractures

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