Rock triaxial direct stretching indoor experimental device and method

Abstract

The invention relates to a rock triaxial direct stretching indoor experimental device. The device includes a base, a confining pressure cylinder, a confining pressure chamber, a confining pressure cover plate, long pull rod bolts, a sample lower base, a fixing screw, a first sealing sleeve, a rock sample, a sample upper base, a sample sealing sleeve, a lateral deformation gauge, an axial deformation gauge, a piston, a confining pressure self-balancing chamber, a tension application chamber, a pull rod, short bolts, a cover body, a confining pressure self-balancing chamber inlet, a tension applying chamber inlet, a communication valve, a confining pressure chamber inlet and a sealing ring. According to the rock triaxial direct stretching indoor experimental device of the invention, appliedrepresentative confining pressure is obtained through calculation according to deep engineering in-situ ground stress; the direct tensile strength and deformation characteristics of rock under different confining pressures can be obtained through the device of the invention, so that the tensile strength criterion of the rock can be obtained through calculation; and therefore, the current cognitiveblank of the tensile strength and mechanical behavior of rock under triaxial tensile stress paths can be filled, the evaluation of the triaxial tensile mechanical strength and deformation behavior ofthe rock is realized, and services can be provided for the safety of deep rock engineering.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics and engineering, and particularly designs an indoor experimental device and method for triaxial direct stretching of rock. Background technique [0002] Rocks are subjected to three-dimensional stress in the formation. The tensile failure process and tensile strength of rocks under three-dimensional stress are generally concerned issues in rock engineering design. At present, the tensile strength of rock is generally determined approximately by specifying 1 / 15 to 1 / 10 of the uniaxial compressive strength, which cannot be accurately obtained or directly measured. There is an indirect splitting test for hard and brittle rocks, which can approximate the indirect tensile strength. However, the splitting test cannot obtain the tensile strength of rocks under three-dimensional stress, let alone obtain the tensile failure process of rocks under three-dimensional stress. Contents of the inventio...

AI Technical Summary

Problems solved by technology

At present, the tensile strength of rock is generally determined approximately by specifying 1 / 15 to 1 / 10 of the uniaxial compressive strength, which cannot be accurately obtained or directly measured

There is an indirect splitting test for hard and brittle rocks, which can approximate the indirect tensile strength. However, the splitting test cannot know the tensile strength of the rock under three-dimensional stress, let alone obtain the tensile failure process of rock under three-dimensional stress.

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