关键词: ?-w曲线, 归一化, 桩侧注浆抗拔桩, 荷载传递法

Abstract: Full-scale static load tests of four sets of uplift piles with side-grouted are carried out in the project of Shanghai Hongqiao Comprehensive Transportation Hub. Curves of side resistance and relative displacement relationship (?-w curve) of all soil layers in the pile range are derived based on the measured data. Firstly, make every soil layer τ-w curves of the full-scale test and the ?-w curves from the direct shear test normalized, in which the normalized parameters are the ultimate side resistance and the corresponding critical relative displacement of pile and soil. Secondary, a hyperbolic function is used to fit the normalized data; and then a unified ?/?ult-w/wult function curve is obtained. Finally, the unified fitted curve is applied into load-transfer method, and the pile head load-displacement relation, pile axial force and side friction distribution curve along the pile depth under different test load levels are gotten easily, so as to use it to predict bearing capacity and deformation properties. It is meaningful in the theoretical analysis and practical engineering.

Key words: ?-w curve, normalization, side-grouted uplift pile, load-transfer method