Rock tension and compression ring shear tester

Abstract

The invention relates to a rock tension and compression ring shear tester. A loading oil cylinder of an axial force executing mechanism of the rock tension and compression ring shear tester is fixedly arranged on one side of the top part of a base, a guide torsion-resistant plate is arranged at an output end of the loading oil cylinder, a spiral swing cylinder of a torsion executing mechanism is arranged on the other side of the top part of the base, a torsion shaft is arranged at an output end of the spiral swing cylinder, the torsion shaft and the guiding anti-torsion plate are oppositely arranged, the rock shearing box comprises a first box body and a second box body which are both annular inside, the first box body is detachably arranged on the side face, facing the torsion shaft, of the guiding anti-torsion plate, the second box body is detachably arranged on the side face, facing the guiding anti-torsion plate, of the torsion shaft, and the first box body and the second box body are in operable butt joint. The rock tension and compression ring shear tester has important significance in accurately acquiring the shear strength, residual strength and shear strength under deformation and power disturbance of the rock and improving and perfecting the constitutive relation of the rock.

Description

technical field [0001] The invention belongs to the technical field of mechanical tests, in particular to a rock tension-compression ring shear tester. Background technique [0002] The shear strength of rock is one of the important indicators to evaluate the mechanical properties of rock, and the accurate acquisition of strength parameters has important practical significance for rock mass engineering. [0003] Under the condition of earthquake or construction disturbance, the dynamic response of rock mass is largely restricted by structural planes, so studying the dynamic characteristics of structural planes, especially the dynamic shear characteristics is an important prerequisite for the analysis of rock mass dynamic response. The laboratory test research on the rock mass mechanical behavior is the premise and basis for constructing the rock mass constitutive model and carrying out the engineering design numerical simulation. Applying cyclic shear loads with different s...

AI Technical Summary

Problems solved by technology

[0005] Analyzing the existing implementation methods of direct shear tests, the rock is shifted with the upper and lower shear boxes during the shearing process, and the normal stress becomes the off-axis stress, so the normal stress is unstable; the original axial normal pressure becomes Off-axis pressure, so that the actual shear surface deviates from the original predetermined ideal shear surface, and oblique shear phenomenon occurs; at the same time, due to the continuous change of the shear area, the distribution of shear stress is uneven; and the dynamic changes of normal stress and shear stress, It also causes the deflection of the principal stress; affected by the edge effect of the rigid shear box, the strain of the sample near the edge of the shear box is the largest, and the strain in the middle part is small, so the shear strain distribution is also uneven, and the shear displacement is affected by the shear The length of the box shows that the shear distance is small, which affects the accuracy of the test results

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