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Abstract The bearing behaviors of vertical pile and inclined piles with inclination angles of 5°，8°，10° and 15° are contrasted according to model test. Effects of inclination on the bearing capacity of single plastic tube cast-in-place concrete pile(TC pile for short)，pile-top settlement，pile shaft horizontal displacement，bending moment along pile shaft，skin friction and the ratio of tip resistance to load on pile top are analyzed. The model test results show that：(1) Effects of pile inclination on the bearing capacity and pile-top settlement are not apparent when the inclination angle of TC pile is less than 8°；but for the inclined piles with inclination angles of 10° and 15°，the reduction of bearing capacity of single pile is significant. (2) Horizontal displacement and bending moment of pile shaft mainly occur in the upper one third of pile length；and both go up with the increase of load and inclination angle. (3) Skin frictions of vertical pile and each inclined pile first increase and then decrease with the increase of pile depth；and the mean values of ultimate skin frictions increase slightly with the increase of inclination angle；and the bearing ratio of skin friction is large. (4) Tip resistance and the ratio of tip resistance to load on pile top go up with the increase of load and fall with the increase of inclination angle. The Origin software is applied to fit the curve between ultimate bearing capacity and inclination angle with Sigmoidal function. The formula is obtained to calculate the ultimate bearing capacity of inclined pile. Based on the field data，the range of correction factor is gained.
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Received: 17 December 2010
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2011, Vol. 30 
