Overlaying-ring ring shear apparatus as well as overlaying ring shear test

Abstract

The invention belongs to the field of geotechnical test and deformation simulation, and particularly relates to an overlaying-ring ring shear apparatus and an overlaying ring shear test for continuouslarge-displacement shear deformation characteristic research of soil and complicated structural soil deformation simulation. The overlaying-ring ring shear apparatus comprises a vertical pressurizingmechanism, a twisting mechanism, a vertical assisting pressure applying mechanism and an overlaying ring shear box mechanism; the overlaying ring shear box mechanism is arranged on the twisting mechanism and can be driven by the twisting mechanism to rotate; the vertical pressurizing mechanism can apply vertical pressure to the overlaying ring shear box mechanism by virtue of the vertical assisting pressure applying mechanism; the limitless deformation ring-shaped shear of different geotechnical test samples of different heights can be performed, and the test sample is enabled to have certainfreedom and continuity in the deformation process; and the overlaying-ring ring shear apparatus can also be used for researching a deformation law of different material contact surfaces, simulating long-distance deformation of the complicated structural soil landslide as well as searching soft layers.

Description

technical field [0001] The invention belongs to the field of rock and soil testing technology and deformation simulation, and is especially used for the research on the characteristics of continuous large-displacement shear deformation of soil and the simulation of soil deformation of complex structures, specifically a stacked ring type ring shear instrument and a stacked type ring shear test. Background technique [0002] The natural soil structure is complex, and there are various shear deformation processes under the same complex stress. For example, it can form a band-shaped plastic deformation, or form a nearly planar rigid slip on a certain weak surface, and more fragmentary The rolling deformation of the stone formed near the shear zone. In addition, the morphology and intensity characteristics of shear bands are more complex if temporal and spatial dimensions are considered. The complex nature of the soil makes it impossible for the general mechanical model to expla...

AI Technical Summary

Problems solved by technology

Although the direct shear test is simple to operate, it also has obvious disadvantages: 1. The direct shear test uses a fixed shear surface, but most objects have elastic deformation and plastic deformation before and after failure, and the shear strain concentration area and deformation damage area should be It is in the shape of a band instead of a plane, and there is a gap between the strength parameters obtained by using the fixed shear surface and the actual situation; Influenced by inhomogeneous materials such as nearby hard blocks and defects; 3. During the shearing process, due to the staggering of the upper and lower samples, the shear area changes, which affects the experimental results; 4. The direct shear test has a small shear distance and cannot be completed large displacement shear

Although the triaxial test provides a certain degree of freedom for the width and position of the shear plane, it also has the problem of being easily affected by inhomogeneous substances such as hard blocks and defects near the shear plane, and the shear distance is small

However, since it still uses a single shear plane, the result is still the sliding friction of a single interface, which cannot consider other deformation states and displacements of other potential shear planes during the shear deformation process, and the uniformity of the sample still remains more sensitive

Images