Akademik Veri Yönetim Sistemi
17th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2009, Alexandria, Mısır, 5 - 09 Ekim 2009, cilt.2, ss.1305-1308, (Tam Metin Bildiri)
The objective of this paper is to critically compare the measured shaft resistance with computed values based on unconfined compressive strength of rock. For this purpose the results of load tests conducted for the foundation piles of high rise towers are studied. The main emphasis is given to the Federation Tower complex in Moscow consists of two tower of 62 and 93 floors. The 93 storey Tower, which soars 354 m will become the tallest building in Europe when completed in 2010. The high and concentrated foundation loads necessitated the utilization of pile foundation, which penetrates into limestone. The foundation piles were 1.50 m in diameter with varying lengths depending on the loads. The subsoil consists of 5 m thick medium strong dolomitic limestone, underlain by 5 to 7 m thick marl with thin limestone sub layers. Medium strong to weak limestone underlies these layers. Weak limestone was encountered at a depth of 22 m in which piles were socketed. Ground water table was located at 6 m below pile cut-off level. Core drilling and pressure grouting were performed underneath each pile for possible cavities in the limestone down to 6 m below pile tip level. Pile design loads vary within the range of 25 MN to 35 MN. Two preliminary pile load tests with Osterberg Cell method were carried out for two different pile socket lengths. The maximum applied bi-directional load was 33 MN corresponding to 66 MN top down load. The measured shaft resistance was compared with emprical methods based on the unconfined compressive strength of rock. Load test results were consistent with calculated shaft resistance values of Reese and O Neil (1989) and Rowe and Armitage (1984). © 2009 IOS Press.