论文部分内容阅读
由于PHC桩经在穿越深厚砂层过程中常造成桩头、桩身疲劳破坏,从而无法沉桩至设计标高。为综合分析此类工况下PHC桩的可打性,本文通过GRLWEAP软件对穿越深厚密实砂层工况的PHC桩进行打桩波动方程模拟,同时在工程现场开展高应变打桩监测试验。研究发现PHC桩穿越深厚密实砂层除了需要选择合理的打桩系统和打桩工艺外,还须采用引孔措施以及对桩身和桩靴进行必要的加强处理。为穿越深厚密实砂层工况下选用PHC桩的设计和施工提供了科学依据。
As PHC piles often cause pile heads and piles to fatigue during the course of crossing deep sand, they can not sink to the designed elevation. In order to comprehensively analyze the operability of PHC piles under such conditions, this paper uses GRLWEAP software to simulate the piling fluctuation equation of PHC piles penetrated deep and dense sand conditions, and carry out high-strain piling monitoring test at the project site. The study found that the PHC pile penetrating the deep and thick sand layer should adopt the drilling measures as well as the necessary strengthening treatment for the pile body and the pile shoe in addition to the reasonable piling system and piling technology. It provides a scientific basis for the design and construction of PHC piles under the condition of deep and dense sand.