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文章结合国道主干线宁波绕城高速公路东段工程建设项目,针对特殊地质条件,研究特有区域地质条件下挤扩支盘桩的承载性能。运用两种静载试桩法(自平衡法、堆载法)对单桩承载性能进行现场试验,并在挤扩支盘桩的同一场地进行了等截面桩的对比试验。通过对比试验分析支盘桩的承载性能,得出支盘桩的支盘发挥的作用占总承载力的40%左右,支盘桩单方混凝土承载力可以提高30%～40%左右,其研究成果可为今后支盘桩的设计和施工提供科学的设计依据。
Combined with the construction project of the east section of the national expressway around the expressway in Ningbo City, this paper studies the bearing capacity of the piles with expanded branch under the special regional geological conditions in view of the special geological conditions. Two kinds of static load test method (self-balancing method and pile-loading method) were used to carry out on-site test on the bearing capacity of single pile, and the contrast test of equal-section pile was carried out on the same site of squeezed branch pile. Through the comparative tests, the bearing capacity of the branch pile is analyzed. It is concluded that the branch of the branch branch has the function of about 40% of the total bearing capacity. The bearing capacity of the single branch concrete branch pile can be increased by 30% ~ 40% It can provide scientific design basis for the design and construction of branch pile in the future.