APPLICATION OF NUMERICAL FLUID ANALYSIS TO VOID FILLING INJECTION WITH USE OF HYDRAULIC PLASTIC GROUT

This paper presents the analytical method suitable for modeling hydraulic plastic grout injected as a void filling material. The analytical method, including fluid equations, a grout boundary expression and time-dependent rheological property's change, showed good correlation with such theoretical values as stress in stable condition and velocities in one dimensional uniform flow. The method was then adopted to a field experiment in which hydraulic plastic grout was injected continuously into a rigid box equipped with pressure gauges. Analytical results could simulate the observed behavior well and consideration of time-dependent rheological property's change was found important for the quantitative estimation for grout pressures.