Method and apparatus for evaluating plastic fluidity of excavated soil in chamber in earth pressure shield method, and earth pressure shield excavator

摘要

PROBLEM TO BE SOLVED: To provide a method and device for plastic fluidity evaluation of excavated soil inside a chamber in an earth pressure-type shield construction method, capable of stably and directly estimating the plastic fluidity of the excavated soil, and to provide an earth pressure-type shield excavator.SOLUTION: An evaluation method includes: fluidity analysis steps (steps S1, S2) in which excavated soil is represented as a group of particles and movement of the particles is analyzed in a particle method based on calculation, for fluidity analysis on a plastic fluidity state of excavated soil utilizing the analysis model; an analyzed torque value calculation step (step S3) for conducting the fluidity analysis of the fluidity analysis step utilizing plastic fluidity as a parameter, and calculating the analyzed torque value for an agitator of the analysis model; a cross-checking step (step S4) for cross-checking a measured torque value of the agitator obtained during the construction work with the analyzed torque value calculated in the analyzed torque value calculation step; and an evaluation step (step S5) for evaluating the plastic fluidity of the excavated soil at the time of construction work.SELECTED DRAWING: Figure 2