CAJ | 학술논문

钙质砂在低应力水平下就会产生颗粒破碎,并伴随有明显的声发射.在不同围压下,对不同初始孔隙比和级配的南沙群岛永暑礁钙质砂进行室内三轴排水剪切试验,同时监测其声发射信号.试验发现:当围压增加或初始孔隙比减小时,钙质砂偏应力峰值逐渐增加,但在某一界限围压时,声发射活动出现最强,在某一界限孔隙比附近时,声发射活动出现最弱;对于级配较差的钙质砂,试验前期声发射活动较弱,其偏应力峰值较小.
개질사재저응력수평하취회산생과립파쇄,병반수유명현적성발사.재불동위압하,대불동초시공극비화급배적남사군도영서초개질사진행실내삼축배수전절시험,동시감측기성발사신호.시험발현:당위압증가혹초시공극비감소시,개질사편응력봉치축점증가,단재모일계한위압시,성발사활동출현최강,재모일계한공극비부근시,성발사활동출현최약;대우급배교차적개질사,시험전기성발사활동교약,기편응력봉치교소.
Particle breakage of calcareous sand occurs at lower stress level, and it results in stronger acoustic emission (AE). Triaxial shear tests on calcareous sand at Yongshu reef of Nansha islands are carried with different confining pressure, initial pore ratio and grain gradation, at the same time AE signals from sand are monitored. Test results show when confining pressure increases or initial pore ratio decreases, deviator stress peak value increase gradually, but AE is the strongest or weakest at some confining pressure or pore ratio limit individually; if the gradation of calcareous sand is poorer, its AE is weaker at the beginning of test; and deviator stress peak value is also smaller.