Capacity of pile foundations for railway over-line electrification equipment

直到21世纪初，英国铁路上的铁路电气化设备（OLE）的基础传统上长达5米。然而，与大西部电气化计划相关的设计方法和结构导致桩长大约增加了两倍。对其原因进行了探讨，并通过一系列有限的实地试验证明了传统经验方法的适用性，但仍然存在相当大的不确定性和进一步节约的机会。本项目的目的是探讨影响铁路OLE支撑杆桩基承载力的因素，其中可能包括路堤或路堑斜坡对横向阻力的影响；土体刚度及适用性评估；荷载循环和阵风荷载的影响；横向、纵向和扭转载荷之间的相互作用；以及站点特征问题。调查方法可能包括现场测试，数值和分析模型，以及岩土离心机测试。

Up until the early 21st century, foundations for railway over-line electrification equipment (OLE) on UK railways were traditionally up to 5 m in length. However, design methods and structures introduced in connection with the Great Western Electrification Programme led to pile lengths up to roughly twice this. The reasons for this have been explored, and the applicability of the traditional empirical approach demonstrated with reference to a limited series of field tests, but considerable uncertainties and opportunity for further economy remain. The aim of this project is to explore factors influencing the capacity of pile foundations for railway OLE support masts, which may include the effects of an embankment or cutting slope on the lateral resistance; soil stiffness and the assessment of serviceability; the impacts of load cycling and gust loading; interactions between lateral, vertical and twist loading; and site characterisation issues. Investigative methods may include field testing, numerical and analytical modelling, and geotechnical centrifuge testing.