Stacking ring shearing box and stacking ring shearing test based on stacking ring shearing box

Abstract

The invention belongs to the technical field of rock ring shear tests, and relates to a stacking ring shearing box and a stacking ring shearing test based on the stacking ring shearing box. The stacking ring shearing box comprises a water bath mechanism, a test sample chamber mechanism and a test sample fixing mechanism, wherein the water bath mechanism comprises a water baht box; the test specimen chamber mechanism is arranged in the water bath box; a groove is formed in the center position of the bottom surface of the water bath box; two or more than two bulges are arranged on one circumference using the center position as the circle center; the water bath box can rotate through being driven by an external twisting mechanism; the unlimited deformation stacking ring type annular shearingof the different-height rock soil test can be met; in addition, in the annular shearing process, certain freedom and continuity of a test sample are ensured; the stacking ring shearing box and the stacking ring type shearing test can be used for studying the contact surface deformation rules of different materials, simulating complicated structure soil layer slide long-distance deformation and searching soft and weak layers.

Description

technical field [0001] The invention belongs to the technical field of rock-soil ring shear testing, and relates to a ring-folding shear box and a ring-folding shear test based on the ring-folding shear box. Background technique [0002] The mechanical characteristics of soil and the deformation state when subjected to external force are the basic subjects in the field of rock and soil mechanics, and are also one of the most concerned conditions in geotechnical engineering construction. For this reason, people have developed a variety of instruments and equipment such as direct shear test, triaxial test, simple shear test, and ring shear test to explore the above content, and have a mechanical model based on material mechanics for analysis. The ultimate goal is to simulate as much as possible The stress-strain characteristics of the soil in actual conditions, so as to obtain its strength parameters. [0003] But it is worth noting that the soil is composed of countless comp...

AI Technical Summary

Problems solved by technology

However, the test box of the direct shear instrument is a rigid body and uses a fixed shear surface. The main problems brought about by this method are: 1. Before the shear failure, the sample lacks elastic deformation and plastic deformation stages, and only shows sliding after failure. Displacement, the failure area is a plane, while the general soil shear failure area is distributed in a band shape, the soil has a certain elastic-plastic deformation, and its deformation is continuous before failure; 2. Because the shear box limits the size of the sample Deformation, resulting in uneven stress distribution in the shear box, resulting in different compressive stress from the preset situation; 3. The use of a fixed shear surface has a low error tolerance rate and is sensitive to the uniformity of the sample, and its results are easily affected by the hardness near the shear surface. Influenced by inhomogeneous substances such as blocks and defects; 4. During the shearing process, due to the staggering of the upper and lower samples, the shear area changes, which affects the experimental results; 5. The direct shear test has a small shear distance and cannot complete large displacement cut

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 sliding displacement without considering other deformation conditions, and it is still sensitive to the uniformity of the sample

In addition, due to the limited height of the shear box, it is also impossible to complete the stress-strain state research of complex structural soil layers or contact surfaces of different materials.

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