| Summary: | 碩士 === 國立高雄大學 === 土木與環境工程學系碩士班 === 96 === This study explores the mechanism associated with the characteristics of the weak sandstone from micro-vision. Firstly, uniaxial tests with tiny specimens are conducted and the photographs of deformation could be obtained simultaneously using microscope. Then, the digital image correlation (DIC) technique is used to effectively measure the whole strain field in micro-vision.
According to the analysis results, the deformation of weak sandstone possesses the following characteristics: (1) when specimens are dry, axial strain and shear strain of matrix are larger than those of grain; when specimens are wet, the strain of grain and matrix are very close; (2) deducing from stress-strain curves, the secant modulus and tangent modulus of each specimens can be obtained, and the secant modulus of grain are higher than that of matrix when specimens are dry, and the tangent modulus exhibits similar tendency.
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