In this study, finite element analysis was carried out to analyze the occurrence mechanisms of underground cavity and relaxation zones caused by soil outflow during the damage to the upper part of the sewage pipe. The occurrence characteristics of the cavity and relaxation zone according to the damage scale of sewage pipe were analyzed. The results showed that the cavity and relaxation zone can be quanti-tatively estimated by using the void ratio and shear stress reduction ratio based on finite element analysis. The occurrence amount variation based on height and width of cavity and relaxation zone was evaluated. The results showed that the occurrence amount variation of cavity and relaxation zone by damage width of sewage pipe was larger in application of the void ratio distribution than the application of the shear stress reduction ratio distribution.
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