LONG-TERM SETTLEMENT CHARACTERISTICS OF A FRICTION PILE

概要

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Long-term loading tests were performed on newly developed short friction piles during the period of four months. Eight test piles of 4.5 m long and 250-430 mm in diameter were installed by grouting mortar under the pressure of 0.7-1.0 MPa in bags woven by a synthetic fiber that had previously been inserted in drilled holes in a soft clayey soil. The long-term vertical loads were applied on the pile heads ranging from 21% to 44% of the pull-out capacity of the piles. Drained soil modulus and creep coefficient that describe the long-term settlement behavior of piles were derived from the observed pile head settlement vs. log time relationship. Both parameters are influenced by the ratio of the long-term applied load to the pull-out capacity, P/P_u. Drained soil modulus reduces with an increase of P/P_u, demonstrating the soil non-linear characteristic, while creep coefficient remains in a fairly constant value. The ratio of the creep coefficient to the soil flexibility (inverse of soil modulus) lies in the range of 0.1-1.5 under P/P_u less than 0.4.
社団法人地盤工学会の論文
1993-12-15