The preliminary study of mechanical properties of medium strength sandstone

• Main Authors: Lin, Shr-Yan, 林士彥
• Other Authors: Jeng Fu-Shu
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/73791670014324595535

碩士 === 國立臺灣大學 === 土木工程學系研究所 === 86 === This reserch uses two kinds of medium strength sandstone samples - Dongken sandstone and Nangan sandstone - to determine the mechanical properties of medium strength sandstone by doing a series test including (1)weakening test;(2)triaxial test with pure shear path;(3)creep test. the result of tests show that the uniaxial strength of Dongken sandstone will decress as the saturation degree of specimen is incress. Compare with mechanical properties and microscopic characters, we suppose that the weakening of Dongken sandstone is caused by the decreasing of the amount of matrix and reduseing the ability of cementation.The result of triaxial tests show that Nangan sandstone will initially perform volume compression when suffer shear stress.When shear stress exceed the shear dilation threshold, the specimen starts to dilate until failure occurs. the normalized shear dilation threshold is about 0.4.The result of creep tests show that the creep behavior of Dongken sandstone is controlled by stress level.