True triaxial multifunctional shearing test device and method for high-temperature and high-pressure hard rock

Abstract

The invention relates to a true triaxial multifunctional shearing test device and method for a high-temperature and high-pressure hard rock, and belongs to the technical field of rock indoor loading experience. The true triaxial multifunctional shearing test device comprises a hydraulic system, a left-end combination tangential loading oil cylinder, a right-end combination tangential loading oil cylinder, a front-end combination lateral loading oil cylinder, a rear-end combination lateral loading oil cylinder, an upper normal loading oil cylinder, a lower normal loading oil cylinder, an annular framework, a lateral auxiliary push-pull framework, an annular framework support platform, a horizontal support plate and an experiment box. Shearing test of the hard rock under a true triaxial condition is initially achieved. In order to meet true triaxial test under the true triaxial condition, the invention designs the loading frameworks and the oil cylinders which have brand-new structures.The integral rigidity of equipment is improved, and meanwhile, a full-section stress coverage loading mode of a rock sample during the true three-way shearing process is ensured; and by improving a front-end cooling mode of the oil cylinder, and the situation that the temperature of hydraulic oil in the oil cylinder is raised at a high temperature reaching 300 DEG C to affect normal motion of an actuator can be prevented.

Description

technical field [0001] The invention relates to the technical field of rock chamber loading tests, in particular to a high-temperature, high-pressure hard rock true triaxial multifunctional shear test device and method. Background technique [0002] As the natural carrier of underground mining, deep-buried tunnels and nuclear waste disposal warehouses, rocks have a bearing capacity that directly affects whether the project can operate normally and is an important guarantee for personnel safety. The underground rock mass is not complete, and there are structural planes and faults with low bearing capacity to varying degrees. Under the action of high shear stress, the rock mass with structural planes is prone to engineering disasters such as earthquakes, landslides, deep cracks, and delayed rockbursts. Therefore, studying the failure mechanism of hard rock with structural planes is of great significance for understanding and preventing engineering disasters. [0003] It is w...

AI Technical Summary

Problems solved by technology

[0005] Most of the current conventional shear testing machines use column-type and tie-rod frames. This frame has low rigidity. During the test, the frame easily accumulates enough elastic strain energy, and the elastic strain energy is released after the peak, making the shear test process more stable. Post-peak curve distortion

Moreover, the hydraulic cylinder of the existing true three-axis equipment can only provide a constant force in each direction, and cannot carry out full-coverage loading of the rock section during the shearing process.

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