岩土力学2026，Vol.47Issue(8)：2638-2652,15.DOI:10.16285/j.rsm.2025.00370
细粒含量对珊瑚砂混合料液化特性影响的试验研究
Influence of fines content on liquefaction resistance of coral sand mixtures
摘要
Abstract
Coral sand(CSD)was mixed with fine soil in varying proportions within real reef ground,exhibiting intricate dynamic behaviors under cyclic loadings,such as earthquakes.Undrained cyclic triaxial tests under diverse confining pressures and cyclic loading stress ratios(CLSR)with various fines content(FC)were conducted to systematically investigate the liquefaction characteristics and excess pore water pressure(EPWP)development.The coarse-grained CSD and fine-grained CSD displayed distinct failure modes,with the fine-grained CSD exhibiting a greater propensity for liquefaction.The liquefaction resistance of CRR20(cyclic resistance ratio)showed a trend of first decreasing and then increasing with the increase of FC,and reached the minimum value near the critical FC(FCth).As FC and confining pressure increased,the axial deformation transformed from a gradual accumulation mode to a slow-rapid development mode.Particle breakage decreased with increase of FC but increased with confining pressure and CLSR.The plastic exhibited a trend of initial decrease followed by subsequent increase as FC rose,attaining its minimum value around FCth.EPWP development curve changed from Type A to Type B as FC and confining pressure increased.EPWP exhibited differential responses during the third stage of Type B development pattern,when FC was relatively low(coarse-grained CSD),the growth rate of EPWP slowed down;while when FC was relatively high(fine-grained CSD),it continued increasing.The EPWP development of CSD mixtures exhibited notable discrepancy from that of quartz sand,thus a new unified EPWP model was proposed.The new findings obtained in this paper provided valuable insights for seismic design of infrastructure on coral island.关键词
珊瑚砂/细粒含量/不排水循环三轴试验/液化特性/颗粒破碎/超孔隙水压力Key words
coral sand/fines content/undrained cyclic triaxial test/liquefaction characteristics/particle breakage/excess pore water pressure分类
建筑与水利引用本文复制引用
顾琳琳,石婷炎,王振,马林建,王建平,叶冠林..细粒含量对珊瑚砂混合料液化特性影响的试验研究[J].岩土力学,2026,47(8):2638-2652,15.基金项目
国家重点研发计划 （）
国家自然科学基金(No.52578413,No.52378401,No.52422808) （No.52578413,No.52378401,No.52422808）
中央高校基本科研业务费专项资金(No.30924010840).This work was supported by the National Key Research and Development Program,the National Natural Science Foundation of China(52578413,52378401,52422808)and the Fundamental Research Funds for the Central Universities(30924010840). （No.30924010840）
