控制饱和度的珊瑚砂振动台液化模型试验研究  

Study on the shaking table liquefaction model test of coral sand with controlled saturation

作　　者：王义德 汪云龙[1,2] 刘荟达 张思宇 袁晓铭 WANG Yide;WANG Yunlong;LIU Huida;ZHANG Siyu;YUAN Xiaoming(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;China Construction Infrastructure Co.,Ltd.,Beijing 100044,China;Department of Engineering Science,University of Oxford,Oxford OX13PJ,UK)

机构地区：[1]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 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080 [3]中国建设基础设施有限公司,北京100044 [4]牛津大学工程科学系,牛津OX13PJ

出　　处：《地震工程与工程振动》2024年第6期117-124,共8页Earthquake Engineering and Engineering Dynamics

基　　金：黑龙江省自然科学基金项目(ZD2023E007);黑龙江省交通投资集团有限公司科研项目(JT-100000-ZC-FW-20220088);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(2023C07)。

摘　　要：为探究珊瑚砂场地的抗液化能力,本研究通过控制饱和度的振动台模型试验,克服一般模型试验中饱和度的模糊状态,对比研究了具有相似饱和度、级配和相对密度的珊瑚砂与石英砂的动态响应和液化行为,探讨了珊瑚砂场地的液化特性。研究结果表明:2种材料在相似饱和度条件下均表现为可液化状态,且在抗液化强度上未表现出较显著差异;液化前珊瑚砂的剪切模量显著高于石英砂,若直接套用现行剪切波速液化判别方法,该场地将判别为非液化场地,从而造成珊瑚砂场地使用中的液化风险被忽视;在液化发生后,二者的剪切模量皆趋于0,表明两类场地液化后的震害相似。研究应用室内模型试验证明了珊瑚砂是可液化土,抗液化强度与陆源砂土相近,这与以往震害调查的结果相互印证;研究中所使用的模型饱和制样方法以及饱和度评价方法可为未来的珊瑚土模型试验提供技术参考。In order to investigate the anti-liquefaction capability of coral sand sites,this study conducted shaking table model tests controlling the degree of saturation to overcome the vague saturation state in general model tests.By comparing the dynamic response and liquefaction behavior of coral sand and quartz sand with similar degrees of saturation,gradation,and relative density,the liquefaction characteristics of coral sand sites were discussed.The experimental results show that both materials are in a liquefiable state under similar degrees of saturation without showing significant differences in anti-liquefaction strength.Before liquefaction,the shear modulus of coral sand is significantly higher than that of quartz sand.If current V s liquefaction assessment method is directly applied,the site would be judged as non-liquefiable,thereby overlooking the liquefaction risk in the use of coral sand sites.After liquefaction,the shear modulus of both tends to be zero,indicating that the post-liquefaction seismic damage of both types of sites is similar.This study has proven through indoor model tests that coral sand is a liquefiable soil with anti-liquefaction strength similar to that of terrestrial sand,corroborating the results of previous seismic damage investigations.Furthermore,the model saturation preparation method and the degree of saturation evaluation method used in this study can provide technical reference for future coral soil model tests.

关 键 词：珊瑚砂 振动液化 振动台试验 模型试验 饱和度 

分 类 号：TU411.8[建筑科学—岩土工程]