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.
Load transfer and bearing capacity of inclined pile under vertical load
Inclination of piles may occur due to different reasons.Most inclinations of piles are beyond the limitation imposed by the Technical Code for Building Pile Foundations(JGJ94—94).How to determine the bearing capacity of inclined piles is a tough problem in practice.Field load tests on 6 inclined piles with different degrees of inclination were performed and their bearing capacities were compared.It was shown by test results that the bearing capacity did not necessarily decrease when the degree of inclination decreases if the inclination was within a small range.Based on modeling one of the load-test results of inclined piles,the required characteristics of soil for FEM analysis were obtained to conduct numerical analysis.The load transfer and bearing capacity of piles with different degrees of inclination under different soil conditions were studied.It was shown by numerical analysis that under the same vertical load the settlement of piles with the degree of inclination no more than 4 percent was even smaller than that of a vertical pile,but comparatively large bending moment would be produced,thus for inclined pile,enough rigidity and strength were required to resist these bending moment and lateral displacement.Lateral displacement and bending of inclined pile could be reduced with the introduction of pile cap.
Tests on Instrumented Piles, Ogeechee River Site
The paper presents and analyzes the results of a series of field tests with instrumented 18-in.-diameter steel pipe piles and 16-in.-diameter square prestressed concrete piles in a deep deposit of uniform, dense sand. The pile lengths were varied from 10 ft to 50 ft in order to establish the variation of point and skin resistances with depth. It is found that these resistances increase approximately linearly with depth only over a limited zone not exceeding 10-pile diam., reaching nearly constant final values, which appear to depend on relative density of the sand only, beyond depths of approximately 20-pile diameter. An excellent correlation is found between these resistances and static, Dutch, cone penetration resistances. Empirical formulas are proposed for determination of pile settlements under load as well as for evaluation for deformation moduli from the results of static penetration tests.