An Experemental Study on the Microscopic Mechanism of Sandstones Weakening

• Main Authors: Chu, Ling-i, 朱凌毅
• Other Authors: Hong, Ju-Jiang
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/60262699337734050652

碩士 === 國立臺灣大學 === 土木工程學系研究所 === 86 === The weakening of sandstones means the decreasing of strength under special conditions, such as the changing of stress, temperature or moisture. This stu dyfocuses on the mechanism of weakening effected by water with a microscopic aspect. The mineralogy, texture, porosity and density of selected sandstones, the sandstone of Mushan formation and the sandstone of Tongken formation, have been studied together with the changing of strength and deformability related with moisture and dry-wet cycles. Microscopic charaters, in particular mineral composition, grain contact and fracture propagation, are used to explain the behavior of weakening. Compare with mechanical properties and microscopic charaters, we suppose that the weakening of Mushan sandstone and Tongken sandstone is caused by the decreasing of the amount of matrix and reduseing the ability of cementation.