@article{oai:u-ryukyu.repo.nii.ac.jp:02002679,
 author = {新城, 俊也 and 宮城, 調勝 and 永吉, 功治 and Shinjo, Toshiya and Miyagi, Norikatsu and Nagayoshi, Koji},
 issue = {48},
 journal = {琉球大学農学部学術報告, The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus},
 note = {琉球石灰岩の砕砂とさんご礁の石灰質砂について三軸圧縮試験を行いせん断特性を比較検討した。主な結果は次のようである。(1) 等方圧密試験による圧密降伏応力は砕砂で0.88MPa, 石灰質砂で0.74MPaであり, 砕砂の圧縮性は石灰質砂に比べて小さい。(2) せん断に伴う粒子破砕は砕砂では石灰質砂に比べて75μm以下の細粒分の増加が著しい。(3) 砕砂では内部摩擦角φ_dは小さなひずみレベルで発現される。(4) 一方, 30%以上の大きな軸ひずみレベルにおける限界状態の内部摩擦角φ_cvは砕砂で35.7°, 石灰質砂で38°である。(5) せん断終了時のe-logp'関係は線形関係にあり, その傾きは砕砂の方が石灰質砂より小さい。このことは石灰質砂では粒子破砕に伴う強度増加の影響が大きいことを示唆している。, A series of triaxial compression tests was carried out on crushed Ryukyu limestone sand to investigate the shear strength characteristics of carbonate sediments litholized with recrystallization. The test results were compared with that of carbonate sand in coral reef. Compression yield stress, internal friction angle at peak strength, critical state frictional angle and e-logp' relation before and after shearing were discussed. Particle breakage in crushed sand shows the increase in fine-grain fraction smaller than particle size of 75μm with compare to carbonate sand. The internal friction angle at peak strength for crushed sand decreases with the increase in confining pressure and on the other hand the friction angle at the critical state is constant regardless of the degree of particle breakage., 紀要論文},
 pages = {113--118},
 title = {石灰質砕砂の強度特性}
}