OBSERVATION AND EVALUATION ON FAILURE MECHANISM OF SLURRY TRENCHES IN SANDY GROUND

摘要

To investigate the failure mechanism of slurry trenches in sandy ground, centrifuge model tests and the elasto-plastic FEM combined with shear strength reduction method (SSRFEM) were performed. From the centrifuge model tests the followings were obtained; the stability condition of slurry trenches was dependent on the length of trench, the lateral confining forces around the sliding block decreased at the yield condition, and the reduction of the lateral confining pressure depended on the slurry trench shape. From the elasto-plastic SSRFEM, the same numerical results as the above were obtained. Lateral confining pressures used for the proposed simple method corresponded to the measured data, and the safety factors obtained by the simple method were appropriate to the test results.