Research on bearing capacity of inclined pile under vertical load
Inclination of piles may occur due to different reasons. How to determine the bearing capacity of inclined piles is a tough problem in practice. Field load tests on inclined piles, the required characteristics of soil for FEM analysis were obtained to conduct numerical analysis. The bearing capacities of piles with different degrees of inclination under different soil conditions were studied. It was shown that the settlement of piles was obviously influenced by the soil conditions, and that under the same vertical load the settlement of piles with the degree of inclination no more than 5 percent was even smaller, but the settlement of piles with the degree of inclination more than 5 percent increase obviously. With the inclination increases its bearing capacity is decreased obviously, thus the degree of inclination is the main factor of which control the vertical bearing capacity of inclined piles.
Shaft Resistance of Single Vertical and Batter Piles Driven in Sand
An experimental investigation of the shaft resistance of single vertical and batter piles pushed into sand was conducted. A prototype laboratory setup was designed for testing relatively large model piles, inclined at an angle that varied between zero and 30° with the vertical. Two model piles having diameters of 38 and 76 mm were tested at a ratio of the pile’s length to diameter up to 40, and subjected to axial compression loading. The pile models were instrumented to allow direct measurements of the shaft resistance. A theoretical model was developed to take into account the asymmetrical earth pressure distribution around the pile shaft, the level of mobilization of the angle of friction between the pile shaft and the sand, and the pile diameter. The results predicted by the theory developed agreed well with the experimental results of the present investigation as well as other experimental and field results available in the literature. Design charts are presented for use in practice. The results of th...
NEW DESIGN CORRELATIONS FOR PILES IN SAND
A critical review of the literature clearly shows that existing theories which are used to determine the bearing capacity of piles driven in sand are not satisfactory. Careful examination of the results of experimental studies indicates that existing theories fail to consider all significant parameters. Field load test data are used to determine which of the pile geometry and soil property parameters are significant. Special attention is given to the problem of residual stresses. Bearing capacity factors are calculated from measured unit point and side resistances. The bearing capacity factors are correlated with relative depth (depth of penetration to diameter ratio) and friction angle or relative density of sand. New design correlations are developed for use in predicting the bearing capacity of axially loaded piles in sand.