Abstract
Powder grouting method, by which surface improved cement particles are injected to the ground by means of compressed air, can ensure the injection length required for soft rocks. In this paper, a model of powder grouting mechanism is presented by considering the interaction between adhesion of a cement particle and drag force by air. A criterion for ensuring the satisfactory injection is also presented by the use of simplified analysis based on the model and a simulation analysis in which DEM is employed.
