Brazilian split method for measuring elastic parameter of rock under extension condition

Abstract

The invention discloses a Brazilian split method for measuring an elastic parameter of a rock under an extension condition, which comprises the steps of: A. horizontally putting a machined disc-shaped sample between the load bearing plates of a press machine by using a Brazilian disc split method, placing a hard steel wire respectively between the upper load bearing plate and the sample and between the lower load bearing plate and the sample, arranging a filler strip perpendicular to the symmetrical surfaces of the sample, and applying pressure on the upper load bearing plate and the lower load bearing plate to make the sample generate tension perpendicular to the action directions of an upper load and a lower load; B. carrying out analysis by using the Hooke's law in classical elasticity mechanics by combining specific conditions of the Brazilian split method; C. analyzing the stress condition of the rock and the measurement principle in the Brazilian disc split method; and D. obtaining the strain in the stress direction according to the Hooke's law from the stress condition sigma3=0, measuring epsilon1 and epsilon2, obtaining the elastic parameter of the rock sample, and arranging a strain gauge in the center position of the rock sample for measurement of epsilon1 and epsilon2. The method has the advantages of easiness for operation and use, clear principle, low material consumption, and the like. The method is suitable for wide popularization and application.

Description

technical field [0001] The present invention relates to the Brazilian splitting method for measuring the tensile strength of rocks, and more specifically relates to a Brazilian splitting method for measuring rock elastic parameters under tensile failure conditions. Elastic properties under tension failure. It is well known that the tensile properties and compressive properties of rock materials are very different, and in the current hot issues of rock mechanics, more and more attention is paid to the special properties of rocks exhibited by tensile failure. The patent of the present invention aims at the tensile failure of the rock, and simply improves the Brazilian splitting method, so as to obtain the tensile strength of the rock, the elastic modulus E and the Poisson's ratio μ under the tensile failure. Background technique [0002] At present, with the continuous development of large-scale water conservancy, hydropower and mining projects in China, rock mechanics is con...

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Problems solved by technology

In the existing tests, the elastic parameters of rock are generally determined by uniaxial compression test or triaxial compression test. The elastic parameters of rock under co

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