114 EMBANKMENT DAM ENGINEERING
Worked Example 2.4
The outline profile of an embankment dam and its foundations are illus-
trated in Fig. 2.19. The dam has a central rolled clay core flanked by shoul-
ders of compacted rockfill.
Fig. 2.19 Worked example 2.4
GEOTECHNICAL DATA
Initial groundwater level (GWL) 2 m AOD.
- Determine the construction crest level required to ensure that the
nominal freeboard shown is not reduced by consolidation settlement.
- Estimate the consolidation settlement which will develop at each of the
points 1, 2 and 3 indicated and determine the total settlement of point 4.
Level (m AOD) Dam Foundation
Core Shoulder Clay A Clay B
From: 40 40 0 1 6
To: 6 40 6 16
Unit weight (kN m^3 ) 20 21.5 20 20
Coefficient of 00.50 0– 00.80 00.60
compressibility
mv( 10 4 m^2 kN^1 )
Equivalent modulus, 0– 02.0 0– 0–
E( 104 kN m^2 )
Influence factors, I, for 00.98 00.95
elastic vertical stress
distribution, mid-depth
of strata on core.
