Abstract
The required condition for an excavated soil in a pressurized slurry shield tunnelling method to stabilize the excavated face can be expressed as its plastic flowability. However, its quantitative appraisal methodology has not been established. For the time being, it is not easy to sustain the excavated face in case of the excavation into a saturated gravel layer which gives a difficulty to obtain a proper plastic flowability.
This research describes the quantitative appraisals of the plastic flowability in a saturated gravel layer through studying the interaction between the results of penetration resistance tests for the excavated soil from earth controlled tunnels, and the past accomplishments of the controlled pressures in the excavated faces and the excavating speeds.
