西北水电Issue(4)：56-61,6.DOI:10.3969/j.issn.1006-2610.2024.04.010
河床深厚覆盖层砂土液化判定对比研究
Comparative Study on Sandy Soil Liquefaction Judgment of Deep Overburden in Riverbed
摘要
Abstract
Liquefaction of sandwill leadtoinstability of foundation and damage of overlyingbuilding structure,whichisone of the common engineer-ing geological disasters inseismic area.Therefore,the liquefactiondiscrimination of proposedsiteisanimportant issueinsurvey and design.This paper uses the particlesizemethod,standardpenetrationtest method,dynamic triaxial test method and shear wave velocitymethod todiscriminate the sandliquefactionof the Holocene lacustrine deposits inthe riverbedoverburdenof the lower reservoir area.The results showthat:discrepancies exist in the discrimination results of the upper lacustrine deposits among different methods.The particle size analysis reveals a clay content of up to 50%,and the failure strength derived from the dynamic triaxial test is over 10 kPa lower than the calculated liquefaction shear stress of the soil layer,which is judged to be non-liquefaction.However,the standard penetration blow count of the soil layer is smaller than the critical standard pene-tration blow count,and the shear wave velocity is also below the upper limit,so it is judged that there is a possibility of liquefaction.Regarding the silty fine sand layer in the lower part of the lacustrine deposits,all methods consistently indicate the presence of sand liquefaction issues.Based on the comprehensive comparison and analysis of the liquefaction discrimination results of four different methods,it is finally evaluated that the upper muddy clay layer of the lacustrine will not be liquefied,but the lower silty sand layer has weak liquefaction resistance and has sand liq-uefaction problems.The study results have significant practical value for the prevention and control of sand liquefaction in engineering area.关键词
砂土液化/深厚覆盖层/液化判别Key words
sand liquefaction/deep overburden/liquefaction discrimination分类
建筑与水利引用本文复制引用
姚爽,巨广宏,王涛,安晓凡,姚晨辉,符文熹..河床深厚覆盖层砂土液化判定对比研究[J].西北水电,2024,(4):56-61,6.基金项目
国家自然科学基金项目(42107172) （42107172）
四川省科技厅重点研发项目(2022YFN0023). （2022YFN0023）
