Field Test and Model Validation of Load-Bearing Characteristics of Different Types of Prefabricated Piles in Soft Soil Areas

Abstract:

In order to deeply explore the vertical compressive bearing characteristics of prestressed high-strength concrete (PHC) pipe piles and prestressed concrete square (YZH) piles in soft soil areas, a single-pile vertical compressive static load test was carried out on 6 PHC pipe piles and 2 YZH piles based on a project in Shanghai, and the load-displacement characteristics of the two types of prefabricated piles were compared and analyzed. The applicability of the exponential function model in predicting the vertical ultimate compressive capacity of single piles was evaluated, and the exponential function model was modified. The results showed that both pile types at the test site failed, and the Q-s curves showed a steep drop. The pile top load level was between 4 725 kN and 6 000 kN, and the resi-dual settlement accounted for more than 87%. Using the modified exponential function model to predict the ultimate bearing capacity of single piles is more accurate and exhibits high consistency, and the prediction curve trend has higher prediction accuracy in the plastic deformation stage.