TM 5-818-1 / AFM 88-3, Chap. 7
g. Use of piles. When stability against bearing
to the center of the base. Limit differential settlement to
the amount of tilting that should not exceed 0.05H. If
capacity failure cannot be satisfied or settlement is
settlements are excessive, stabilize compressible soils
excessive, consider a pile foundation. Use batter piles if
by surcharge loading or a support wall on piles.
the horizontal thrust of the lateral earth pressure is high.
f.
Deep-seated failure. Check the overall
stability of the retaining wall against a deep-seated
14-5. Crib wall. Design criteria of crib walls are
foundation failure using methods of analysis outlined in
presented in figure 14-9.
chapter 8. Forces considered include weight of retaining
wall, weight of soil, unbalanced water pressure,
14-6. Excavation support systems. The use of
equipment, and future construction. The minimum safety
steep or vertical slopes for a deep excavation is often
factor is 1.5.
necessitated by land area availability or economics.
U. S. Army Corps of Engineers
Figure 14-8. Estimates of increased pressure induced by compaction.
14-9
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