An adaptive structural plane shear box device

Abstract

The invention discloses an adaptive structural surface shearing box device, which comprises an upper shearing box inner box, an upper shearing box outer box, a lower shearing box inner box, a lower shearing box outer box, an upper shearing box outer box There are in-line spherical ball rows between the inner side wall and the outer side wall of the inner box of the upper shear box and between the inner side wall of the outer box of the lower shear box and the outer side wall of the inner box of the lower shear box. There is an in-line cylindrical ball arrangement between the bottom surface of the upper shear box and the outer box; the inner box of the upper shear box, the inner box of the lower shear box and the outer box of the upper shear box are equipped with bolt holes for fixing the specimen. Bolt holes are provided with specimen fixing bolts and fixing pins. The invention can flexibly adapt to the shape and size of on-site sampling test pieces and indoor self-made test pieces, and can meet the requirements of minimal disturbance and high-precision testing of the test pieces after on-site sampling.

Description

technical field [0001] The invention relates to a rock indoor direct shear test technology in the technical field of rock mechanics, in particular to a specimen fixing device for a structural face indoor shear test. Background technique [0002] The physical and mechanical properties of structural surfaces are one of the important factors affecting the stability of engineering rock mass, which are usually determined by indoor push shear tests. Process the sample chiseled on site into a specimen that matches the size of the shear box, pour it into the shear box, apply a normal load to the upper part of the specimen, fix the horizontal displacement of the upper shear box, and apply shear to the lower shear box. The shear load was used to cause the specimen to fail along the shear joint reserved in the middle, and to evaluate its shear strength. [0003] According to relevant national regulations, the original physical state of the structural surface should be maintained durin...

AI Technical Summary

Problems solved by technology

In the current shear test, the shear box generally has a fixed shape and size, and most of the materials sampled on site need to be processed indoors or fixed by pouring. Under the influence of cutting vibration, cutter head cooling water immersion or pouring disturbance, etc., The physical and mechanical properties of the structural surface often change to a certain extent, which brings great challenges to the preparation of the specimen; if the size of the specimen is strictly consistent with the inner diameter of the shear box, during the normal loading process, due to the Lateral expansion and deformation will cause excessive friction between the specimen and the side of the shear box, so that the normal load does not fully act on the shear plane; if the size of the specimen is too small than the inner diameter of the shear box, the During the loading process, it is easy to cause the specimen to shake sideways, causing the shear surface to be broken or twisted instead of sheared, resulting in the failure of the test

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