Abstract
In order to elucidate the mechanism of permeation by short gel time grouts, we investigated the effects of injection pressure P', injection rate q, injection time t, and gel time Gt on the solidified shapes. Through a lot of injection tests using the large injection apparatus, we obtained the following conclusions. 1) Permeation without fracturing is possible as long as P' is increasing during injection. 2) If the permeability of sand is large enough, the succesive grout can permeat spherically by perforation in the pore gel at the solidified part.
