UFC 3-220-01N
15 AUGUST 2005
Figure 8-7.4 Relative Density as a Function of Vibrofloat Hole Spacings
8-7.4
Grouting and Injection. Grouting is a high-cost soil stabilization method
that can be used where there is sufficient confinement to permit required injection
pressures. It is usually limited to zones of relatively small volume and to special
problems. Some of the more important applications are control of groundwater during
construction; void filling to prevent excessive settlement; strengthening adjacent
foundation soils to protect against damage during excavation, pile driving, etc.; soil
strengthening to reduce lateral support requirements; stabilization of loose sands
against liquefaction; foundation underpinning; reduction of machine foundation
vibrations; and filling solution voids in calcareous materials,
8-7.4.1
Grout Types and Groutability. Grouts can be classified as particulate or
chemical. Portland cement is the most widely used particulate grouting material.
Grouts composed of cement and clay are also widely used, and lime-slurry injection is
finding increasing application. Because of the silt-size particles in these materials, they
cannot be injected into the pores of soils finer than medium to coarse sand. For
successful grouting of soils, use the following guide
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