Penetration test device of shorn rock samples

Abstract

The invention discloses a penetration test device of shorn rock samples, comprising a cylinder barrel, a positioning ring is arranged in the cylinder barrel, a convex pressing head supporting against the bottom end surface of a rock sample is arranged below the positioning ring, an annular gap is formed between the convex pressing head and the inner wall of the cylinder barrel, an exhaust plug isarranged in the annular gap, a lower piston is arranged at the lower part of the convex pressing head, water injection channels are arranged at the middle parts of the lower piston and the convex pressing head, a baffle ring is arranged at the upper part of the positioning ring, a water permeable plate is arranged at the upper part of the baffle ring, an upper piston is arranged at the upper partof the water permeable plate, a water draining channel is arranged on the upper piston, and a connecting pipe nozzle is arranged at the outlet of the water draining channel. When water permeates, therock sample is subjected to shear deformation simultaneously; at the moment when the structure is damaged, the seepage velocity is changed violently so as to imitate the characteristics of water burst and verify the seepage instability process of water burst along with damage of the structure. The penetration test device has the advantages of simple structure, low test cost, rapidness of sealing,reliable performance and extensive practicality.

Description

A shear rock sample penetration test device technical field The invention relates to a seepage test device, in particular to a shear rock sample seepage test device suitable for rock mechanical property tests. Background technique In order to simulate the real mechanical properties of the rock, the test device for the permeability characteristics of the rock failure process is used to expand the functions of the MTS815 series rock mechanics test system. The current permeability tests that can be carried out include: (1) the stress-strain full-range permeability test of the standard rock sample under the joint action of confining pressure and axial load; (2) the permeability characteristic test of the standard rock sample after uniaxial compression rupture, which The fractures of these rock samples are fully expanded and have almost no bearing capacity, so a special device must be designed to achieve the sealing of the rock samples; (3) The permeability characteristics test...

AI Technical Summary

Problems solved by technology

None of these testing techniques can simulate the drastic changes in permeability properties during rock sample failure

Although the test of the permeability characteristics of curved rock samples can reproduce the rapid change of the permeability characteristics during the destruction of the rock samples, due to the flaws in the sealing design of the rock samples, the expected results are often not achieved

Other experimental techniques can only reflect the quantitative change of rock sample seepage velocity, but not the change of flow state

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