珊瑚砂液化后再固结体应变试验研究

Reconsolidation Volumetric Behavior of Coral Sand Sample after Liquefaction

南海岛礁建设作为我国"海上丝绸之路"的战略工程,其上覆建构筑会遭受波浪、地震等环境循环荷载,地面沉降将会产生严重的地震灾害。利用GDS三轴仪,研究了珊瑚砂动加载液化后的再固结体应变的变化规律。试验结果表明:珊瑚砂液化后再固结体应变随着有效围压的增加、颗粒级配平均粒径的增加也逐渐增加,而循环应力比对于珊瑚砂的再固结体应变的影响仅与液化后动荷载施加的时间有关,与大小无关。

As a strategic project of China’s"Maritime Silk Road",the man-made structures on islands and reefs in the South China Sea have to resistance the cyclic environmental loads such as waves and earthquakes,as well as the ground subsidence induced by seismic events.In this paper,the volumetric strain in the reconsolidation induced by the dynamic loading liquefaction is evaluated by the GDS triaxial testing device.The results indicate that,the volumetric strain in the reconsolidation by the dynamic loading liquefaction increases with the confining pressure and mean grain size in the sample;while the effect of cyclic stress ratio on the volumetric strain in the reconsolidated coral sand samples is only related to the time of dynamic load applied after liquefaction,not the size of grains in the sample.