Loading mechanism capable of increasing confining pressure and constraining rotation of sample

Abstract

The invention discloses a loading mechanism capable of increasing confining pressure and constraining rotation of a sample. The loading mechanism is characterized in that a loading press head is arranged in a limit barrel and comprises a loading press head side wall and a loading pressure head top; an axial loading device is arranged above the loading pressure head top; an outer sleeve, an upper cushion block and a rock and soil sample are arranged in the loading press head side wall; multiple loading head through holes are further formed in the loading pressure head side wall; the diameter of each loading press head through hole is 1-2 cm; the total area of all loading press head through holes accounts for 50%-60% of the area of the loading press head side wall except the contacted area of the upper cushion block. The device can limit movement of the rock and soil sample in a designated direction under the condition that the confining pressure and axial load are guaranteed, so that the middle part of the rock and soil sample slides, and a displacement mode of a geologic body during shear dislocation is obtained through total simulation.

Description

technical field [0001] The invention relates to an auxiliary device for a model test device for dislocation displacement distribution of an active fracture zone under the effect of ground stress, in particular to a loading mechanism capable of applying confining pressure and constraining the rotation of a sample. Background technique [0002] The active fault zone refers to the fault zone that has been active for many times during the late Quaternary period (especially since about 0.15 Ma), and will continue to be active now and in the future; as the latest surface structural trace, its activity will definitely reflect In terms of landform, strong earthquake activity, geological body dislocation, etc. [0003] When traffic tunnels or hydraulic tunnels pass through the active fault zone, the dislocation (stick-slip and creep) of the active fault zone will cause the surrounding rock and supporting structure of the tunnel (hole) to undergo severe shearing, making the tunnel (ho...

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Problems solved by technology

[0006] Aiming at the deficiencies in the test of the existing model test device for the dislocation displacement distribution of the active fault zone under the consideration of the ground stress effect, the purpose of the present invention is to provide a loading mechanism that can increase the confining pressure and constrain the rotation of the sample, so as to solve the experimental problem. The uncertainty of the axial stress caused by the infiltration of the hydraulic medium during the process, and also solve the problem of the sample rotation during the loading process

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