EI 02G001
CEMP-E
01 July 1997
Table 1-9. Expanded Base Piles.
LENGTH
3 - 18 M (10 - 60 FT)
MATERIAL
ACI 318 FOR CONCRETE
SPECIFICATION
DESIGN
33% OF 28-DAY CONCRETE STRENGTH
STRESSES
62 MN (9 KSI) FOR PIPE SHELL IF THICKNESS GREATER THAN
3.2 MM (0.125")
DESIGN LOADS
6 - 12 MN (60 - 120 TONS)
DISADVANTAGES
BASE OF FOOTING CANNOT BE MADE IN CLAY OR WHEN HARD SPOTS
SUCH AS ROCK LEDGES ARE IN THE PENETRATED SOIL
PRECAUTIONS REQUIRED FOR SHAFT GROUPS WHEN CLAY LAYERS
MUST BE PENETRATED TO REACH THE BEARING STRATUM
ADVANTAGES
HIGH CAPACITY SHAFTS CAN BE PLACED WITHOUT EXCAVATION OR
DEWATERING
HIGH BLOW ENERGY AVAILABLE FOR OVERCOMING OBSTRUCTIONS
HIGH UPLIFT RESISTANCE WHEN ADEQUATE STEEL REINFORCEMENT
GRANULAR SOIL WHERE BEARING CAPACITY CAN BE OBTAINED BY
APPLICATION
COMPACTION AT THE BASE
1.2 - 1.8 M (4 - 6 FT) MINIMUM SPACING
ILLUSTRATION
1-12
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