Method for determining anisotropic elastic modulus of schist

Abstract

The invention relates to a method for determining the anisotropic elastic modulus of a schist, and aims at providing the method for determining the anisotropic elastic modulus of the schist so as to provides a reliable foundation for accurately estimating the stability of a tunnel of the deeply burned schist and late support. The technical scheme disclosed by the invention is that the method for determining the anisotropic elastic modulus of the schist is characterized by comprising the following steps of: a, carrying out scene nondestructive sampling; b, obtaining three groups of rock cores drilling in parallel direction, in vertical direction and in a direction in which boreholes and the schist form certain included angles; c, respectively carrying out a uniaxial compression test on the three groups of rock cores, so as to obtain an intact stress-strain curve of each rock core, and obtain the mean elastic modulus and the mean poisson ratio of each group of rock cores; d, inserting the test result obtained from the step c into the following formula to determine variable G'; and e, inserting E, E', v' and G' into the formula, and then taking the inverse number, so as to obtain a curve of which the elastic modulus of the loading direction changes along the included angles beta. The method is suitable for deeply buried tunnel engineering.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for precise measurement of underground structures by creating smaller rocks with their own properties such as flexibility or resistance against external forces like pressure. By doing this it provides more accuracy than existing methods while also minimizing any potential damaging impact upon nearby areas when analyzed.

Problems solved by technology

In this patented technical problem addressed in the study described earlier, there exist issues with understanding how rocks behave differently during excavation operations such as drilling and blast holes. Specifically, current methods use values based upon average properties rather than considering specific aspects like orientation (strain) and loadings. These results can be misleadingly attributed to factors other than just their own weight force acting on them.

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