TM 5-815-5/AFM 88-5, Chap 6/NAVFAC P-418
above the groundwater table must be high enough to
that of overlapping grout holes. Detailed information
ensure that the hydrostatic pressure exerted by the
on grouting methods and equipment is contained in
slurry will prevent caving of the sides of the trench
TM 5-818-6.
and yet not limit operation of the excavating equip-
(2) Slurry walls. The principal features of design
of a slurry cutoff wall include: viscosity of slurry used
ment. Neither shall the slurry be so viscous that the
backfill Will not move down through the slurry mix.
for excavation; specific gravity or density of slurry;
Typical values of specific gravity of slurries used range
and height of slurry in trench above the groundwater
from about 1.1 to 1.3 (70 to 80 pounds per cubic foot)
table. The specific gravity of the slurry and its level
U.S. Army Corps of Engineers
Figure 4-36. Flow beneath a partially penetrating cutoff wall.
4-46
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