Abstract: The analysis methods on the stability of soil cavities have developed rapidly at both domestically and abroad. The Finite Element Method (FEM) with Strength Reduction Method is frequently used in the stability evaluation of soil cavities. This paper presents the analytical results of FEM with Strength Reduction Method by using PLAXIS on the stability of a soil cavity without considering the effect of groundwater and seepage. The results were also examined by the stability charts developed by Drumm et al through FEM. The results indicate that the FEM evaluation of soil cavity stability with PLAXIS is appropriate. The approach used also improved the charts developed by Drumm et al since no surcharge was considered in the charts.

Key words: Soil Cavities, Stability Analysis, PLAXIS Software, Finite Element Method with Strength Reduction Method, Soil Improvement