Rolling antifriction device applied to rock mechanics and geotechnical engineering tests

Abstract

The invention relates to the technical field of rock mechanics and geotechnical engineering test devices and particularly relates to a rolling antifriction device applied to rock mechanics and geotechnical engineering tests. The device comprises a movable plate, a fixed plate, elastic connecting pieces and rolling antifriction bodies, wherein the movable plate and the fixed plate are stacked; themovable plate is formed by arranging a plurality of movable blocks; the movable blocks and the fixed plate and the adjacent movable blocks are connected through the elastic connecting pieces; the rolling antifriction bodies are correspondingly arranged between the opposite faces of the movable blocks and the fixed plate and between the opposite faces of the adjacent movable blocks. The fixed plateand each movable block forming the movable plate are driven by an external force to generate corresponding coordinate position rolling dislocation, the antifriction direction is not restricted, two-way ultra-low antifriction requirements are met by using point contact type rolling antifriction, the elastic connecting piece of the rolling antifriction device has an automatic reset function, and when the external force disappears, the antifriction device can be reset and restored automatically.

Description

technical field [0001] The invention relates to the technical field of rock mechanics and geotechnical engineering test devices, in particular to a rolling anti-friction device applied to rock mechanics and geotechnical engineering tests. Background technique [0002] In rock mechanics tests, there is often a large friction between the boundary of the specimen and the bearing block, and the resulting boundary friction effect will greatly affect the accuracy and reliability of the test results, especially in some compression model tests. In this case, the samples used are often cast model specimens such as sand and concrete. The surface of the specimen is rough and not smooth. During the compression process, the deformation of the specimen will cause a large friction force on the boundary surface, resulting in the stress distribution state inside the specimen. Inhomogeneity, thereby affecting the accuracy of the test. [0003] At present, the most common boundary friction re...

AI Technical Summary

Problems solved by technology

[0002] In rock mechanics tests, there is often a large friction between the boundary of the specimen and the bearing block, and the resulting boundary friction effect will greatly affect the accuracy and reliability of the test results, especially in some compression model tests. In this case, the samples used are often cast model specimens such as sand and concrete. The surface of the specimen is rough and not smooth. During the compression process, the deformation of the specimen will cause a large friction force on the boundary surface, resulting in the stress distribution state inside the specimen. Inhomogeneity, which affects the accuracy of the test

[0003] At present, the most common boundary friction reduction method used in model tests is to apply silicone oil or other grease lubricating materials between the force transmission plates in contact between the model and the test bench, and then cover a layer of polytetrafluoroethylene film, or add A layer of grease and a layer of polytetrafluoroethylene film can reduce friction through the low friction coefficient between the two layers of polytetrafluoroethylene film. There is also a "rolling bearing + bearing plate + load bearing" placed between the loading head and the model. However, for large-scale model tests, due to the large boundary area of ​​the model and uneven force, it is bound to cause inconsistent deformation of the model boundary. Coordinated and torn, the anti-friction effect is not ideal. The rolling bearing type anti-friction box is a linear contact type rolling anti-friction, and its anti-friction direction is limited, so it is difficult to meet the requirements of large-area boundary two-way anti-friction.

Images