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孔压静力触探(piezocone penetration test,CPTU)原位测试提供的是最直接、最原始的土性参数,可以精细化反映土层信息随深度的非线性变化。采用原位测试CPTU锥尖贯入参数对桩基水平承载力进行评价,建立锥尖参数与p-y曲线参数的综合对应关系,提出基于CPTU原位测试的单桩p-y曲线计算及水平承载力确定方法。依托典型场地(靖江长江漫滩,宿迁废黄河泛滥区,苏州昆山太湖流域)水平试桩资料,对比验证了CPTU法p-y曲线模型的准确性及其在桩基水平承载预测中的可行性。结论表明:CPTU测试p-y曲线法能准确反映水平受荷桩的土抗力发挥特点,是一种高效、快速的桩基水平承载力确定方法。
The piezocone penetration test (CPTU) in-situ test provides the most direct and primitive soil parameters that can be refined to reflect non-linear changes in soil depth with depth. The horizontal bearing capacity of pile foundation was evaluated by in-situ testing of CPTU conical tip penetration, and the comprehensive correspondence between cone tip parameters and py curve parameters was established. The py curve calculation and horizontal bearing capacity determination of single pile based on CPTU in situ test . The accuracy of the p-y curve model of CPTU method and its feasibility in the horizontal bearing prediction of pile foundation are verified by relying on the horizontal test pile materials of typical sites (Jingjiang Yangtze River floodplain, Suqian abstention Yellow River flood plain and Kunshan, Taihu Lake basin, Suzhou). The conclusion shows that the p-y curve method of CPTU test can accurately reflect the characteristics of soil resistance of horizontal piles. It is an efficient and rapid method to determine the horizontal bearing capacity of piles.