Abstract
This paper presents the study of a slope stability failure due to a roadway widening using an FEA program. It consists of a case study of static load induced liquefaction in a simple roadway widening project constructed in the north eastern part of Ohio in 2008. The widening required an embankment fill, which moved nearly 4 feet vertically and 1 foot laterally after days of installation. The main objective of the work is to compare different approaches dealing with this static liquefaction situation; in this case, limit equilibrium method (LEM) and finite element analysis (FEA) method are being studied. The use of two approaches is important to show how the results can be compared and to determine the reliability of the factor of safety (FS). The mechanism that caused the rotational slope failure was the liquefaction of sand layers beneath the road embankment. The study explains how this loose sand layer could be simulated with the use of FEA which provides an advanced tool to perform a more complete and accurate analysis. The study concluded that each method has its advantages and limitations; however with the use of FEA, it was possible to build a more realistic model since advanced material model and properties could be defined which are more adequate for such cases as liquefaction in sands.KeywordsSlope stabilityStatic liquefactionCritical state soil mechanicsFEM
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