Abstract
In order to clarify the injected shapes by the long gel time grouts in the sandy ground, we investigated the relation among the inject rate, the inject pressure and the permeability of sands. The injection tests on several kinds of sands of which permeability was 10-2--5(cm/s) were performed through the triaxial injection apparatus (the diameter of specimen D=470mm). The main conclusions are summarized as follows: 1) the allowable inject rate depends upon the confining pressure as well as the permeability of sands. 2) the critical inject rate that enables the permeation grouting can be determined by the relation between the inject rate and the inject pressure in the steady flow condition.
