True triaxial hydraulic coupling test device for realizing visualization based on biaxial rheometer

Abstract

The invention relates to a true triaxial hydraulic coupling test device for realizing visualization based on a biaxial rheometer, thereby carrying out hydraulic coupling testing on a marble sample with front and rear surfaces having centers with penetrating cracks in a front-rear communication manner. The true triaxial hydraulic coupling test device comprises two modified polycarbonate plates thatare in a mutual butt joint manner to form square sealed inner space and a biaxial rheometer loading assembly for applying pressures on a marble sample in four directions. The marble sample is arranged in the sealed inner space; and the biaxial rheometer loading assembly applies pressures on the marble sample by the modified polycarbonate plates.. Compared with the prior art, the true triaxial hydraulic coupling test device has advantages of true three-axis loading, visual operation, and the like.

Description

technical field [0001] The invention relates to the field of stress loading tests of rock-like materials, in particular to a true triaxial hydraulic coupling test device for realizing visualization based on a biaxial rheometer. Background technique [0002] Under the influence of tectonic movement, unloading, weathering, etc., various types of discontinuous structural planes will be formed inside and on the surface of the rock mass, such as joints, faults, stratum dislocation planes, unloading cracks, weathering cracks, etc. These Structural planes together constitute the fracture network structure inside the rock mass, and their distribution characteristics and interactions are closely related to the mechanical properties of the rock mass. In deep-buried caverns, due to construction disturbance and seepage water pressure, the three-dimensional stress of the surrounding rock is redistributed, which can easily lead to the expansion and penetration of the fracture network, red...

AI Technical Summary

Problems solved by technology

At present, most studies on the evolution of cracks in surrounding rocks focus on the expansion mechanism of simple cracks (single cracks or parallel cracks) under a single load, and there are few studies on the evolution of crack networks considering the time effect in multi-cracked surrounding rocks. Especially for the surrounding rocks of deeply buried caverns, there is still a lack of research on the evolution mechanism of the fracture network under the coupling effect of high stress and high osmotic pressure from both macro and meso perspectives.

True triaxial loading equipment is needed to study the macroscopic and microscopic characteristics of fracture network damage in surrounding rock under high stress and high osmotic pressure, but currently known true triaxial loading equipment cannot meet the needs of this experiment to observe the development process of surrounding rock fracture network. Require

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