Efficiency improvement of steel H-bearing piles
31 steel H-bearing piles, each 16 m long, were driven 14 m deep with two types of single acting diesel hammers. 11 piles were equipped with different types of laggings, 2 piles were injected with a special grout under high pressure and one pile was injected with concrete under low pressure. An electro-osmosis test was performed by applying a direct electrical current between the test pile and its reaction piles. Two different test sites were selected, a sandy site at Kallo, Belgium and a clay one at Merville, France. The first site presented a 12 m thick dense sand layer overlain by 5 m of soft soils; the soil resistance was mobilised by a combination of end bearing and shaft friction. The second site presented a 40 m thick stiff fissured clay layer overlain by 2 m of soft clay; the soil resistance was mobilised mainly by shaft friction. To allow for a fast resistance determination, most of the piles were tested dynamically with a pile driving analyser during installation. Strain gauge, extensometer and accelerometer measurements, recorded at several levels during driving and during static loading, allowed for the determination of steel stresses and resistance distribution along the statically tested piles.
Bibliographic Reference: EUR 11904 EN (1988) 255 pp.
Record Number: 198910112 / Last updated on: 1994-12-01
Original language: en
Available languages: en