饱和砂土液化特性的振动台试验研究  

Shaking table tests on the liquefaction characteristics of saturated sand

作　　者：赵轩 马淑芝[2] 马硕 文生奡 ZHAO Xuan;MA Shuzhi;MA Shuo;WEN Sheng'ao(Hubei Tianli Construction Technology Co.,Ltd.,Wuhan 430072,Hubei,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,Hubei,China)

机构地区：[1]湖北天利建筑技术有限责任公司,湖北武汉430072 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《地震工程学报》2024年第2期376-387,共12页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(41672309)。

摘　　要：基于地震模拟振动台试验,配制3组不同平均粒径和3组不同细粒含量的6个砂土模型,通过埋置于砂土内部的传感器监测模型内部不同位置的超孔隙水压力等指标,分析砂土模型内部的超孔隙水压力时程曲线及孔压比时程曲线,归纳出地震波加载峰值、砂土平均粒径、细粒含量及埋置深度等因素对饱和砂土液化特性的影响规律。试验结果表明:随着地震波加载峰值的增大,砂土模型液化程度逐渐增大,液化势逐渐增大,抗液化强度逐渐减小;随着砂土埋置深度的增加,砂土细粒含量的增加,砂土平均粒径的增加,砂土模型液化程度逐渐减小,液化势逐渐减小,其抗液化强度逐渐增大。同时,试验结果还表明,砂土液化各影响因素对砂土液化的影响程度依次为地震波强度>砂土埋置深度>砂土平均粒径、细粒含量。试验结果可为后续数值模拟的参数选取提供支持,为研究其他因素对砂土液化的影响提供参考。In this paper,six sand models with three groups of various mean particle sizes and three groups of various fine contents were prepared based on the earthquake simulation shaking table test.Sensors embedded in the sand were used to monitor the excess pore water pressure at different positions in the model,and the time-history curves of excess pore water pressure and pressure ratio in the models were analyzed.Furthermore,the effects of some factors,such as the peak value of seismic wave loading,mean particle size of sand,fines content,and buried depth,on the liquefaction characteristics of saturated sand were summarized.Test results show that the liquefaction degree and potential of sand models gradually increase with the peak value of seismic wave loading,and the liquefaction resistance slowly decreases.With the increase in the buried depth,fines content,and average particle size of sand,the liquefaction degree and potential of sand models also gradually decrease,and its liquefaction resistance gradually increases.The results reveal that the influence degree of various influencing factors on sand liquefaction is seismic wave strength>buried depth of sand>mean particle size and fines content of sand.The test results can help support the parameter selection of subsequent numerical simulations and provide a reference for studying the influence of other factors on sand liquefaction.

关 键 词：砂土液化 影响因素 振动台 超孔隙水压力 孔压比 

分 类 号：TU475.1[建筑科学—结构工程]