Shear box device having self-adaptive structural plane

Abstract

The invention discloses a shear box device having a self-adaptive structural plane. The shear box device comprises an upper inner shear box, an upper outer shear box, a lower inner shear box and a lower outer shear box, wherein two in-line arrangement spherical ball rows are respectively arranged between the inner side wall of the upper outer shear box and the side wall of the upper inner shear box and between the inner side wall of the lower outer shear box and the outer side wall of the lower inner shear box; an in-line arrangement cylindrical ball row phase is arranged between the top surface of the lower outer shear box and the bottom surface of the upper outer shear box; test piece fixing bolt holes are respectively formed in the upper inner shear box, the lower inner shear box and the upper outer shear box; a test piece fixing bolt and a fixed plug pin are arranged in each test piece fixing bolt hole. The shear box device can flexibly adapt to the shape and size of a field sampling test piece or an indoor homemade test piece, and can meet the requirements of the test piece for minimum disturbance and high precision test after field 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...

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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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