19 June 2001
Portland cement grout is most applicable where the grout can be pumped directly
An effective grouting procedure for sandy materials consists of
injecting solutions of sodium silicate and calcium chloride. This procedure both
solidifies the soil and makes it impermeable, but it is extremely expensive.
Mixtures of cement and clay are also used, sometimes adding a chemical
One of the more recently developed chemical grouts polymerizes in
the soil voids; however, it is also expensive. With fine-grained backfills, grouting
is generally of no benefit except to fill cavities or to seal off paths of soil removal.
10-3.2.6 Preventing Loss or Settlement of Soil. Maintaining good surface
drainage is the most important preventive maintenance measure for earthwork
structures. Efficient runoff of rainfall and overflow water must be ensured. If
subsurface drainage features exist, they must be kept clear (for example,
periodic cleaning of weep holes). Hand-placed riprap can be added to the slope
just behind the sheet piling, if storm runoff results in heavy soil loss.
Future Inspection Requirements. Where the rate of erosion or
settlement has been increasing the structure must be closely monitored to
provide early warning of impending failure. Where a major problem has been
encountered and corrected, increased inspection may be necessary to ensure
that the repair is effective.