THE STUDY ON SUITABLE SLURRY PROPERTIES WITH SLURRY-TYPE SHIELD DRIVING IN SANDY SOILS

Abstract

A comparative study was made on the amount of the excessive pore water pressure produced during shield excavation and values of the current management items for various types of slurry. The result of the study revealed that current management item alone are not sufficient to evaluate the slurry properties. Then, we evaluated the slurry properties during shield excavation using the groutability ratio (GR). Our study has demonstrated that the excessive pore water pressure is minimized in the case of slurry having the GR value of 14 to 16, density of 1.20, fannel viscostiy of 25 to 30 second.