This paper presents the development of load transfer curves that can be used to estimate the displacement under axial load of driven piles in sand. The maximum skin friction and end bearing stress are obtained from the ISO 19901-4 (2021) CPT-based formulations which were calibrated using a high quality database of static pile load tests compiled for this purpose (Lehane et al. 2020). The load displacement responses measured in the 71 static load tests in this database are used to derive CPT-based non-linear load-transfer curves. It is shown that good estimations of pile displacements can be obtained using CPT data and the normalised formats of shaft and base load transfer functions provided in the API(2011) and ISO 19901-4 (2021) recommendations.

中文翻译：

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基于CPT的沙子中打入桩荷载传递公式

本文介绍了载荷传递曲线的发展，可以用来估计在砂中打入桩的轴向载荷下的位移。最大的皮肤摩擦和端部轴承应力来自基于ISO 19901-4（2021）CPT的配方，该配方使用为此目的而编译的高质量静态桩载荷试验数据库进行了校准（Lehane等人2020）。在该数据库的71个静态载荷测试中测得的载荷位移响应用于得出基于CPT的非线性载荷传递曲线。结果表明，使用CPT数据以及API（2011）和ISO 19901-4（2021）建议中提供的竖井和基础荷载传递函数的规范化格式可以很好地估计桩的位移。