DEADMAN CAPACITY USING SIMPLIFIED SOIL COLUMN APPROACH USING IDENTIFIED FACTORS
MODEL
DEADMEN (EA)
DEADMAN
DIMENSIONS
NET RESTRAINT
PROVIDED (LBS)
FACTOR OF
SAFETY
CEN5/CE5/CE7
2
8’ X 18” X 8”
22,200
3.01
CEN7/CE10
2
8’ X 18” X 8”
26,232
2.60
CEN10/CE14
2
8’ X 18” X 8”
29,320
2.00
CEN14/CE21
2
10’ X 18” X 8”
39,065
1.81
CEN21/CE30
2
12’ X 18” X 8”
51,235
1.75
14
The table below shows concrete deadman sizing calculations using the soil wedge approach for FujiClean
CE and CEN models and provides the uplift restraint and factor of safety for a soil having a failure plane of
22.5
˚
and a coefficient of friction of 0.4. The soil is cohesive, compacted to at least 95 percent Proctor
density, and fully submerged. The saturated density of concrete and soil are 87.6 and 62.6 lb/ft3,
respectively. The calculations include a factor of safety.
Keep in mind that uplift restraint is just one of several good practices related to maintaining long-term
tank integrity. Service providers should avoid pumping tanks when groundwater conditions are
unfavorable, and they should pump only sufficient liquid to complete the task. Pumped tanks should be
refilled as quickly as possible.
