Abstract
Rock material has different mechanical behaviors under compressive and tensile loading. Correspondingly, there are two types of elastic modulus: compressive elastic modulus Ec and tensile elastic modulus Et, respectively. To distinguish which indirect test methodology, including three-points bending test and Brazilian disc test, is more suitable to measure the tensile elastic modulus Et of rock materials, a series of uniaxial compressive test (UCT), direct tensile test (DTT), three-points bending test, and Brazilian disc test are performed for three typical types of rock: marble, granite, and sandstone. Comparative investigation on the reliability of measurement results of tensile elastic modulus Et is systematically conducted. Finally, it is found that Brazilian disc test could be a suitable method to measure tensile elastic modulus of rock materials, due to the excellent agreement with that measured by DTT and the simplicity of sample preparation, as well as test operation.
Highlights
Elastic modulus of rock materials is an inherent parameter, describing the deformation characteristics of rock material under loading
Elastic modulus of rock material is classified into compressive elastic modulus and tensile elastic modulus
It is found that Brazilian disc test could be a suitable method to measure the tensile elastic modulus of rock materials, due to the excellent agreement with that measured by direct tensile test (DTT) and the simplicity of sample preparation, as well as test operation
Summary
Elastic modulus of rock materials is an inherent parameter, describing the deformation characteristics of rock material under loading. It plays an important role regardless of quantitative numerical modelling, or in the qualitative evaluation system of engineering rock mass. It has been well known that rock material has different mechanical behaviors under compressive and tensile loading [1, 2]. Elastic modulus of rock material is classified into compressive elastic modulus and tensile elastic modulus. Rock material has much more excellent performance under compression than that under tension. Erefore, it is a design goal to let the vast majority of rock material to be in the compression state in rock engineering.
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