CONTROL OF CHEMICAL GROUT INJECTED IN SEEPAGE DOMAIN. PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING, SAN FRANCISCO, 12-16 AUGUST 1985

An extensive series of 79 large-scale laboratory tests have been performed to determine the limiting conditions under which a chemical grout can be injected successfully into a cohesionless soil deposit permeated by water to form a cut-off. Four different chemical grouts and five different soils, ranging from fine sand to pea gravel, were included in the experimental program. The gel times of the grouts extended from a few minutes to more than half an hour, and seepage velocities as high as 60 cm/min were used. The behavior of a given soil-grout system is strongly related to the viscosity of the grout and moderately dependent on the effective grain size of the soil. Both of these properties influence the extent of the dilution that takes place, and dilution, in turn, delays the gelation of the grout and lowers its viscosity, and thereby exerts a dominant effect on the distribution of the grout in the soil mass. For the covering abstract of the conference see IRRD 287689. (Author/TRRL)