Cylindrical core direct shear testing machine

Abstract

The invention belongs to the field of rock mechanics testing. In order to solve the problem of directly carrying out the shear test along the cylindrical rock or the cylindrical axial surface of the cylindrical rock containing the structural surface, the present invention provides a cylindrical core direct shear testing machine, which is structured as follows: a sample holder, an upper fixing plate, a lower Fixing plate and adjusting screw. The cylindrical core direct shear testing machine realizes the direct shear test of the columnar core and the columnar core with the structural plane, which solves the problem that the size and properties cannot be effectively carried out, and also solves the problem of deformation caused by concrete pouring. Coordination, distortion of deformation measurement results, low test success rate, etc., also overcome the time-consuming and labor-intensive problems of concrete pouring, and save pouring costs and personnel costs.

Description

technical field [0001] The invention belongs to the field of rock mechanics testing, and solves the problem of directly carrying out a shear test along a cylindrical rock or a cylindrical axial surface of a cylindrical rock containing a structural surface, in particular to a cylindrical rock core direct shear testing machine. Background technique [0002] The shear mechanical property of rock is one of the essential key mechanical parameters in rock mass engineering construction. In the preliminary exploration of deep engineering, the cores used for shear tests are usually obtained by drilling columnar cores with exploration drilling holes in the geological exploration process. . Due to the small size of the core, it is difficult to ensure that it is cut to the standard size required for the test, and for the drilled columnar core containing the structural plane, after cutting in the direction perpendicular to the core axis, the structural plane may penetrate through the cu...

AI Technical Summary

Problems solved by technology

However, the shear test of concrete pouring faces many difficulties. For example, the strength and deformation characteristics of the concrete are not coordinated and synchronized with the rock to be tested. During the process of applying normal load and shear load, the concrete will first fail, resulting in the success of the test. The rate of deformation is low; the deformation of concrete is much higher than that of rock, especially the larger deformation is more likely to occur at the cemented interface, which leads to the fact that the normal deformation and tangential deformation measured by the test cannot effectively reflect the actual situation; concrete needs a certain curing age, usually After 28 days, the test efficiency is seriously affected, and the cost is greatly increased; the total weight of the test piece after pouring concrete is greatly increased, and it is difficult to transport and install, requiring multiple people to work together, resulting in serious waste of human resources; for test pieces with structural surfaces, after pouring Disturbances during transportation and transportation are more likely to cause changes or damage to the state of the structural surface, and the test is difficult to achieve the expected results

The above problems severely restrict the research on the shear mechanical properties of cylindrical rocks and their structures.

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