Page 116 - Buried Pipe Design
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High,
for degree of compaction of bedding, lb/in 2
Moderate,
(for Initial Flexible Pipe Deflection)
Slight,
E′
Average Values of Modulus of Soil Reaction E′
Dumped 95% Proctor, 85–95% Proctor,
85% Proctor, 70% relative density 40–70% relative density
40% relative density 0 No data available. Consult a competent soils engineer; otherwise, use E′ 1000 400 200 50 2000 1000 400 100 3000 2000 1000 200 3000 3000 3000 1000 ±0.5 ±
Soil type-pipe bedding material (Unified Soil Classification System ∗ ) 50) † Soils with medium to high plasticity 50)
Soils with medium to no plasticity with less than 25% coarse-grained particles 50)
Soils with medium to no plasticity with more than 25% coarse-grained particles Co
TABLE 3.4 Fine-grained soils (LL CH, MH, CH-MH Fine-grained soils (LL CL, ML, ML-CL Fine-grained soils (LL CL, ML, ML-CL GW, GP, SW, SP ‡ Crushed rock † LL E′ SOURCE: Div.,
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