珊瑚礁砂地震液化评价与排水阈值条件研究  

Study on seismic liquefaction evaluation and drainage threshold conditions for coralline sand

作　　者：曹振中[1] 史欢欢 秦志光 莫红艳[1] 袁晓铭[2,3] CAO Zhenzhong;SHI Huanhuan;QIN Zhiguang;MO Hongyan;YUAN Xiaoming(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China;Key Laboratory of Environment Protection&Safety in Foundation Engineering of Transportation,China Communications Construction Company,Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510290,China)

机构地区：[1]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 [2]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 [3]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080 [4]中交第四航务工程局有限公司,中交交通基础工程环保与安全重点实验室,广东广州510290

出　　处：《地震工程与工程振动》2023年第5期22-32,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51968015)。

摘　　要：历史地震曾多次出现珊瑚礁砂液化并造成了严重的液化震害,目前缺乏针对珊瑚礁砂的液化评价方法与依据。针对动三轴液化试验中动应力衰减现象及其后果进行分析,并给出动应力衰减校准方法。对南海珊瑚礁砂开展动三轴、室内标准贯入试验,以Seed石英砂液化判别临界曲线为基准,提出基于标贯击数的珊瑚礁砂液化判别方法构建思路与判别公式,并采用1993年关岛地震、2010年海地地震的珊瑚礁砂液化实测标贯数据对判别公式进行检验,结果显示判别公式具有较高可靠性。开展渗透与孔压消散体积变形试验,构建埋藏与排水条件的分析模型,给出珊瑚礁砂达到完全可排水状态所需要的最小排水层厚度。采用Seed的APOLLO计算程序分析珊瑚礁砂的孔压增长与消散,给出珊瑚礁砂发生液化的渗透、排水阈值条件,为珊瑚礁砂的抗液化措施提供一个新的思路。The liquefaction of coralline sand has occurred many times in historical earthquakes and caused serious liquefaction earthquake damage.There is a lack of liquefaction evaluation method and procedure for coralline sand.In this paper,the dynamic stress decay phenomenon and its consequences in the triaxial liquefaction test are analyzed,and the dynamic stress decay calibration method is given.Triaxial tests and standard penetration tests of coralline sand collected from the South Sea of China were conducted to explore the difference of liquefaction resistance and standard penetration blow count between coralline sand and quartz sand.Based on the Seed’s critical curve of liquefaction evaluation of quartz sand,the liquefaction assessment formula of coralline sand was developed,and the formula was tested by the measured SPT data of coralline sand that liquefied in 1993 Guam earthquake and in 2010 Haiti earthquake.The permeability tests and volume deformation tests during pore water pressure dissipation were conducted,and the threshold drainage conditions for the occurrence of coralline sand liquefaction were developed.Seed’s APOLLO program was used to analyze the pore water pressure generation and dissipation of coralline sand,and the permeability and drainage threshold conditions for the occurrence of liquefaction of coralline sand were given to provide an innovative idea for liquefaction mitigation measures of coralline sand.

关 键 词：珊瑚礁砂 液化判别 标准贯入 渗透系数 排水条件 

分 类 号：TU435[建筑科学—岩土工程]