颗粒级配对南沙珊瑚砂液化特性的影响  

Influence of particle gradation on liquefaction resistance of Nansha coral sand

作　　者：赵胜华 赵艳林[1,2] 何江[1] 曹振中[2] 席方超[2] ZHAO Shenghua;ZHAO Yanlin;HE Jiang;CAO Zhenzhong;XI Fangchao(College of Civil Engineering and Archltecture, Guangxi University, Nanning 530004, China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《中国科技论文》2021年第4期402-407,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(41672296,41272358)。

摘　　要：为研究不同固结比和不同有效围压条件下颗粒级配对饱和珊瑚砂动强度和孔压发展的影响,对人工配置的3种级配珊瑚砂样开展动三轴试验。结果表明:在均等和非均等固结条件下,平均粒径的增大有利于提高珊瑚砂的动强度;但随着有效围压的增大,平均粒径对珊瑚砂动强度的提高作用越来越不明显;珊瑚砂的孔压发展曲线形态整体呈上凸趋势,并随平均粒径的增大而愈加明显。To describe influence of particle gradation on cyclic strength and pore pressure growth of saturated coral sand,coral sand samples were studied by GDS dynamic triaxial test under different effective confining pressures and consolidation ratios.The results show that the increase of average particle size is beneficial to improve the cyclic strength of coral sand under the condition of equal and non-uniform consolidation;However,with the increase of effective confining pressure,the effect of average particle size on the cyclic strength of coral sand was reduced obviously.The pore pressure development curve of coral sand presents an upward convex trend,which is more obvious with the increase of average particle size.It is necessary to carry out foundation treatment for coral sand site with small average particle size according to the research results.

关 键 词：岩土工程 珊瑚砂 动三轴试验 颗粒级配 循环动载强度 

分 类 号：TU435[建筑科学—岩土工程]