液化型路堤边坡地震安全性分析

Safety analysis of embankment slope with seismic liquefaction problems

地震液化型路堤边坡安全性问题涉及岩土工程与工程地震两个学科领域,是边坡工程与砂土液化的交叉课题。路堤边坡在地震时,因基础之下的砂土发生液化现象,会急剧发生地基承载力丧失、液化沉陷、侧向流动、液化喷砂、整体滑动等问题。应用NCEER液化评估方法(SPT)、Mononobe-Ok-abe方法、Koerner方法和Fellen ius方法,以抗液化安全系数、液化侧向流动安全系数、液化喷砂安全系数和抗滑安全系数为评价指标,系统对地震液化型路堤边坡安全性进行了分析、计算和评价。结果显示,文中方法对地震液化型路堤边坡安全性分析具有适用性。

Seismic liquefaction problems of embankment slope related to two different subject fields（geotechnical engineering and engineering seismology）,is a cross topic of slope engineering and sand liquefaction.Sand soil under embankment slope can be liquefied by earthquake,and can lead to liquefaction problems such as bearing capacity,settlement,lateral spreading,sand boils and global sliding.Using NCCER method（SPT）,Mononobe-Okabe method,Koerner method and Fellenius method,the assessment index system including liquefaction safety factor,liquefaction lateral spreading safety factor,liquefaction sand boils safety factor and sliding safety factor,is put forward to evaluate the security of embankment slope with liquefaction problems.As a case study,the result shows the methods have wide applicability for embankment slope with liquefaction problems.