Method for calculating tensile strength of rock under confining pressure condition and application

Abstract

The invention discloses a method for calculating the tensile strength of rock under a confining pressure condition. The method is used for calculating the tensile strength of the rock according to a relation criterion of the confining pressure and the tensile strength of the rock. The method comprises the following steps: S1, carrying out tensile tests on a rock sample under different confining pressure conditions to obtain the tensile strength of the rock sample under the action of different confining pressures; and S2, performing data fitting according to different confining pressures and the corresponding tensile strength, determining a constant value related to the current rock material attribute, and calculating the tensile strength of the current rock under different confining pressure conditions according to the determined relationship criterion of the rock confining pressure and the tensile strength. The rock confining pressure and tensile strength relation criterion provided by the method provides a basis for rock fracture identification, a comparison reference is provided for judging rock fracture through tensile strength, and a theoretical basis is provided for stabilitycontrol and instability early warning of engineering rock mass.

Description

technical field [0001] The invention relates to the technical field of rock mechanics research, in particular to a method for calculating the tensile strength of rock under confining pressure and its application. Background technique [0002] Rock tensile damage is often encountered in most rock engineering constructions, such as tunnel excavation, underground cavern construction, unloading of high and steep slopes, and mining. The process of rock fracture is often accompanied by a large in-situ stress, that is, the rock will be subject to confining pressure, and the tensile damage under complex in-situ stress conditions is often more severe. Once handled improperly, it is likely to cause delays in construction progress and damage to personnel and equipment etc. cause damage. At present, the rock fracture process is generally equivalent to a simple uniaxial tensile failure, ignoring that the rock will be subjected to confining pressure in the actual environment, so it is ne...

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Problems solved by technology

[0003] At present, there are relatively few studies on the tensile strength of rocks under different confining pressure conditions, and there is no general criterion for the relationship between confining pressure and tensile strength, and it is impossible to analyze the changes in the tensile failure strength of rocks under confining pressure. make predictions

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