A ring shear test and soil sample preparation device suitable for vertical shear planes

Abstract

The invention relates to a device suitable for ring shear test and soil sample preparation of a vertical shearing surface. The device comprises a shearing box, a lifting system, a power rotating system, a monitoring control system, a soil sample preparation system and a frame, wherein shearing plates are uniformly fixed on an annular base plate along the radial direction of the annular base plate; an outer cover of the shearing box is covered on the annular base plate and the shearing plates and is assembled and fixed with the annular base plate through a guide strip and a guide slot; the outer cover of the shearing box is connected with a rotating force arm of the power rotating system and is used for transmitting torque; a coupling pressing plate is aligned and embedded into a central hole of a top plate of the outer cover of the shearing box and is driven by the lifting system to load normal force; the annular base plate is aligned and embedded into a cylindrical support platform; and under the effect of driving torque, an inner cylindrical side wall generated by the circling motion of the annular base plate under the driving of the shearing plates is the vertical shearing surface. According to the invention, the shearing displacement and the uniform distribution of the shearing stress on the shearing surface can be guaranteed, the thickness of the vertical shearing surface is not limited and the device has the functions of sample preparation and vertical shearing test.

Description

technical field [0001] The invention relates to a ring shear tester, in particular to a ring shear test and soil sample preparation device suitable for a vertical shear surface, and belongs to the technical field of geotechnical test devices. Background technique [0002] Direct shear instrument and simple shear instrument are geotechnical test instruments that were earlier used in the study of soil shear properties. However, the limitations of these two instruments are that they can neither realize large displacement soil shear tests nor keep the shear area constant during the test. It was not until the advent of the ring shear instrument that the above two difficulties were solved, and at the same time it was ensured that the sample could be sheared under continuous displacement conditions. [0003] The development of the ring shear instrument began in the 1920s. The design concept of the early ring shear instrument is relatively simple, and the function is relatively si...

AI Technical Summary

Problems solved by technology

However, this feature will cause the following problems: the uniform angular velocity on the entire shear plane during the shearing process will cause different shear displacements on the shear plane along the radial direction, resulting in uneven distribution of shear stress

However, due to the limitation of its own size, the previous ring shear tester is only suitable for the study of the mechanical properties of small particle size soil samples, but it is almost difficult to simulate the real mechanical properties of the actual rock and soil mass.

[0007] Therefore, based on the above two shortcomings of the previous ring shear instrument (uneven distribution of shear stress on the shear surface; small shear surface thickness, large particles are not allowed in the test sample, and it is difficult to simulate the real mechanical properties of the actual rock and soil mass), It is necessary to develop a new type of large-scale ring shear tester suitable for vertical shear (the normal direction of the shear surface is perpendicular to the direction of the shear angular velocity vector) and a matching rock and soil sample preparation device to make up for the above-mentioned two deficiencies

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