TM 5-818-1 / AFM 88-3, Chap. 7
U. S. Army Corps of Engineers
Figure 3-20. Chart for estimating undrained modulus of clay.
Table 3-6. Values of Modulus of Subgrade Reaction (ks) for Footings as a Guide to Order of Magnitude
a
Soil Type
Range of ks, kcf
Loose sand
30-100
Medium sand
60-500
Dense sand
400-800
Clayey sand (medium)
200-500
Silty sand (medium)
150-300
Clayey soil
<
qu 4 ksf
75-150
<
4 < qu 8
150-300
8 < qu
>300
a
Local values may be higher or lower.
U. S. Army Corps of Engineers
3-24
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