Abstract

Pile foundations are usually subjected to cyclic loading which could possibly causes a significant degradation of the friction mobilised along the pile shaft. Most of the experimental studies devoted to analysing the behaviour of the pile-soil interfaces under cyclic loading tests are performed at a few hundred of cycles. However, a large number of cycles of the order of hundreds of thousands may cause a severe degradation of pile capacity. The present work aims to study the effect of cyclic loading parameters on the evolution of shaft friction of pile subjected to a large number of cycles. The experimental study is based on a physical modelling in a calibration chamber of axial cyclic loading of single pile jacked into sand under a large number of cycles, up to 10⁵. It is found that cyclic amplitude, confining pressure and soil density have a significant effect on the evolution of skin friction along the pile shaft at a large number of cycles.

摘要

桩基通常承受循环载荷，这可能会导致沿桩轴移动的摩擦力显着降低。大多数致力于分析循环载荷试验下桩土界面行为的实验研究都是在几百个循环中进行的。然而，数十万数量级的大量循环可能导致桩容量的严重下降。本工作旨在研究循环载荷参数对经受大量循环的桩轴摩擦演变的影响。实验研究基于在校准室中的物理建模，单桩顶入砂中的轴向循环载荷在大量循环下，高达 10 ⁵. 研究发现，循环幅值、围压和土体密度在大量循环中对沿桩身的表皮摩擦演化有显着影响。