滨海复杂地层PHC管桩和灌注桩承载性能对比研究OA北大核心

Based on a foundational engineering project in the coastal area of Qingdao,this study conducts field tests on the vertical compressive static load of single piles for both PHC pipe piles and cast-in-place piles.Taking into account the complex geological conditions of the project,the study analyzes the vertical bearing characteristics of these two pile types foundations and evaluates the applicability of the exponential model and hyperbolic model in predicting the ultimate vertical compressive bearing capacity of single test piles.The research results show that PHC pipe piles have higher bearing capacity and more stable performance,making them more suitable for complex coastal geological conditions.In contrast,the bearing performance of cast-in-place piles is significantly influenced by pile length and the length-to-diameter ratio.Employing the exponential model and hyperbolic model respectively to predict the Q-s curves for PHC pipe piles and cast-in-place piles,it is found that the exponential model is more accurate in predicting the ultimate vertical compressive bearing capacity of PHC pipe piles,while the hyperbolic model is more accurate for cast-in-place piles.The research results provide reference and guidance for optimizing the design and construction of pile foundations in coastal areas of Qingdao.