Jet Grout Stabilization of Steeply Excavated Soil Slope

Jet Grouting is a ground treatment technology that allows in-situ ground stabilization by mixing soil with grout. Grout is pumped into drilled holes at ultra high pressure to loosen and mix the grout into the soil. The result is columns of material having higher strength than the original soil. This technology was selected as the means of improving the stability of a high and steep excavated slope. This project also involved installation of vertical sand columns and intercepting horizontal drains to alleviate hydrostatic pressures in the slope and stabilization of the slope face with geocell reinforcement anchored by drilled soil nails. This paper outlines the design and construction process of a project that demonstrates a unique application of ground improvement technologies to allow construction of a new public highway.