含细粒珊瑚土抗液化特性试验研究  

Experimental study on liquefaction resistance characteristics of fine-grained coralline soils

作　　者：陈平山[1,2] 吕卫清 梁小丛 周红星[1,2] 王婧[1,2] 马佳钧 CHEN Ping-shan;LÜWei-qing;LIANG Xiao-cong;ZHOU Hong-xing;WANG Jing;MA Jia-jun(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou,Guangdong 510230,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai,Guangdong 519082,China;CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou,Guangdong 510290,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin,Heilongjiang 150080,China)

机构地区：[1]中交四航工程研究院有限公司,广东广州510230 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]中交第四航务工程局有限公司,广东广州510290 [4]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《岩土力学》2023年第2期337-344,共8页Rock and Soil Mechanics

基　　金：南方海洋科学与工程广东省实验室(珠海)创新团队建设项目(No.311020009);黑龙江省自然科学基金(No.ZD2019E009);中国地震局工程力学研究所基本科研业务费专项资助项目(No.2020B07)。

摘　　要：珊瑚土作为新兴的热带地区岛礁与港口工程的首选土工材料,宽级配是其结构组成的主要特征。由于相关工程面临较高的地震风险,珊瑚土的抗液化能力正逐渐引起重视。为探究含细粒珊瑚土的抗液化能力,以东太平洋某热带港口工程的实际珊瑚土场地为背景,通过大粒径循环三轴液化试验测试了设计相对密实度为0.4~0.8的3组代表性级配试样及剔除细粒的两组试样的饱和不排水动强度。试验结果表明:幂函数可以模拟含细粒珊瑚土的循环应力比与液化所需振次关系;细粒的存在与相对密实度的提高不会显著提高珊瑚土抗液化能力;珊瑚土液化过程的超静孔压发展模式与砂土相近,两参数或三参数的反正弦模型可以较好地模拟含细粒珊瑚土的液化超孔压发展过程。研究表明,含细粒珊瑚土仍然属于可液化土类。以背景工程为例,同类型工程在设计施工及使用阶段都需要考虑对地震液化灾害的设防,该研究为珊瑚土液化防治工作提供了技术支持。Coralline soils are the emerging preferred geomaterial for island-reef engineering and harbor engineering in tropical regions,and wide gradation is the main feature of their structural composition.The liquefaction resistance of coralline soils is gaining attention due to the high seismic risk of related engineering projects.In order to investigate the liquefaction resistance of coralline soils containing fine grains,the saturated undrained dynamic strengths of three groups of representative graded samples with designed relative compaction of 0.4–0.8 and two groups of samples without fine grains were measured by large-scale dynamic triaxial liquefaction test based on an actual site of coralline soils in a tropical harbor engineering in the eastern Pacific Ocean.The test results indicated that the power function could simulate the relationship between the cyclic stress ratio and the number of cycles to cause liquefaction for coralline soils containing fine grains;the presence of fine grains and the increase of relative compaction did not significantly improve the liquefaction resistance of coralline soils;the excess pore water pressure development pattern of liquefaction process of coralline soils was similar to that of sandy soils,and the inverse sine model with two or three parameters could simulate the excess pore water pressure development of liquefaction process of coralline soils containing fine grains.The study revealed that the fine-grained coralline soils still belonged to liquefiable soils.Based on an actual engineering project,the same type of engineering project needed to consider the prevention of seismic liquefaction hazards in the design,construction and use stages,and this study provided technical support for the prevention and control of liquefaction for coralline soils.

关 键 词：珊瑚土 含细粒土 珊瑚土液化试验技术 超孔隙水压力 珊瑚土吹填工程 

分 类 号：TU435[建筑科学—岩土工程]