EXPLANATION OF BEHAVIOR ABOUT BOTTOM GROUND FOR TEMPORALLY EXCAVATING WORK BASED ON STRESS AND PROPOSE OF PREDICTION METHOD BASED ON ELASTIC THEORY

Abstract

In excavating works using temporally retaining walls under low-permeable ground with confined aquifer, the installed length of the wall often depends on the study of the stability against the heaving of bottom ground. In this study, pore water pressure and effective stress obtained by 2-dimensional soil-water couped finite element analyses were examined and the possibility of usage of the predicting method about heaving was clarified. Furthermore, instead of use of finite element analysis, the calculation method of earth pressure based on the classical soil mechanics was examined for evaluating the stress condition under the bottom ground of excavation. The calculated vertical and horizontal stress coincided with them obtained by finite element analyses, so the applicability of the proposed method was validated as the use of predicting method of the occurrence of heaving.