SHAKING TABLE TESTS ON UPLIFT MECHANISM OF OPEN CUT TUNNEL IN LIQUEFIED GROUND

Abstract

A series of shaking table tests were conducted to investigate the uplift mechanism of open cut tunnel in liquefied ground. The external force acting on the tunnel during shaking was monitored precisely by twocomponent loadcells and the deformation of the ground during shaking was also monitored by image processing system. The experiments revealed that the uplift behavior of tunnel was largely affected by the degree of liquefaction of the ground especially around the tunnel and it was difficult to predict the total uplift displacement of tunnel only by using safety factor against uplift. Based on these test results, some measures against uplift displacement of tunnel were suggested.