Preparation device of indoor single-cracked rock specimen

Abstract

The invention relates to a preparation device of a rock cracked specimen, in particular to a preparation device of a single-cracked rock specimen filled with a binding material with a certain thickness. The preparation device comprises a base, an upper movable seat, a lower rock core fixing lantern ring, an upper rock core fixing lantern ring, a threaded spindle, an adjusting screw cap and a fastening screw cap; the concentricity of an upper rock core and a lower rock core arranged in the upper rock core fixing lantern ring and the lower rock core fixing lantern ring can be ensured through adjusting the position of the spindle relative to a through groove of the base and the position of the upper rock core fixing lantern ring relative to a horizontal through groove; the distance between the upper rock core and the lower rock core is controlled through the adjusting screw cap and the fastening screw cap; and meanwhile, the thickness of a binding layer between the upper rock core and the lower rock core is ensured so that the upper rock core and the lower rock core are coupled and butt-jointed to form a standard single-cracked rock specimen. The preparation device of the single-cracked rock specimen in the invention is easy to manufacture, simple in operation, strong in practicability and capable of being widely used for preparing single-cracked rock specimens.

Description

technical field [0001] The invention relates to an indoor rock sample preparation device, in particular to an indoor single-crack rock sample preparation device, which belongs to the technical field of geotechnical engineering. Background technique [0002] During the on-site excavation of engineering rock mass, problems such as cracking, lower bearing capacity, enhanced permeability and water softening will inevitably occur in the rock mass. Therefore, grouting reinforcement within a certain disturbance range has become an important technical measure in the field of rock mass engineering. . However, the evaluation of the effect of improving the shear capacity of rock mass fissures after grouting has always been a problem that plagues engineers and technicians in this field. For grouting, carry out the direct shear test of the grouting fracture surface, and compare it with the situation without grouting, which can make a good evaluation and provide a basic basis for enginee...

AI Technical Summary

Problems solved by technology

However, in the process of making single-crack rock samples, it is difficult to accurately control the concentricity of the upper and lower cores of the crack, the parallelism of the two loading end faces, and the thickness of the bonding layer, which cannot meet the requirements of laboratory tests for rock sample preparation. It is impossible to accurately simulate the actual situation on site, so it seriously restricts the development of relevant mechanical tests and the acquisition of design basis

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