Experimental device for measuring rock shear strength of single rock sample and using method

Abstract

The invention discloses an experimental device for measuring rock shear strength of a single rock sample and a using method. The experimental device comprises a base, a test bed with a bulge is set onan upper surface of the base, a simulated rock block with a cuboid structure is placed on an upper surface of the test bed, and a pressurizing frame is matched with an upper surface of a simulated rock block, and an upper surface of the base is further connected with a first adjusting screw and a second adjusting screw which are perpendicular to the base. Threaded holes are formed in the two endsof the pressurizing frame, and the first adjusting screw and the second adjusting screw penetrate through the threaded holes in the surface of the pressurizing frame; a support is connected to an upper surface of the pressurizing frame, a high-speed camera is connected to an upper surface of the support, and a lens of the high-speed camera faces the simulated rock under the high-speed camera. According to the invention, visual image analysis can be carried out on the seepage opening degree of a crack in the rock, a laboratory test environment can be well adapted, the operation is facilitated,and the reliability of a detection result is improved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering shear strength research, in particular to an experimental device for measuring rock shear strength of a single rock sample and a use method. Background technique [0002] With the development of modernization of the country, many projects such as highways, bridges and tunnels are being constructed rapidly. In the design and construction of underground projects, the shear resistance of rock is a very important mechanical index. It is often related to the feasibility and danger of engineering design. It is the rock The maximum shear stress that can be borne when it fails under the action of shear load has direct shear strength and triaxial shear strength. For example, shear strength parameters are provided in the stability analysis of dams, slopes, and underground caverns. , different engineering strengths can be better divided from different shear resistance zones. Rock mass stabil...

AI Technical Summary

Problems solved by technology

[0003] At present, the indoor measurement methods for rock shear strength are generally direct shear method and ordinary triaxial method. In the direct shear method, the stress distribution on the shear surface is not uniform, and its shear strength curve is not a strict curve, which has a certain impact on the test accuracy. Although the ordinary triaxial method is more accurate than the direct shear method and the stress distribution is more uniform, it cannot control the shear plane, and the stress is completely independent.

And the requirements for rock bedding are very high. It is difficult to find multiple similar bedding rocks that can be used for experiments in natural rocks. Classifying similar rocks will inevitably cause experimental errors.

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