Capacity of pile foundations for railway over-line electrification equipment

直到世纪初，英国铁路上的铁路跨线电气化设备（OLE）的基础传统上长达5 m。然而，与大西部电气化计划有关的设计方法和结构导致桩长度达到大约两倍。对此原因进行了探讨，传统的经验方法的适用性证明了参考有限的一系列现场测试，但相当大的不确定性和进一步经济的机会仍然存在。本项目的目的是探讨影响铁路OLE支撑桅杆桩基承载力的因素，包括路堤或路堑边坡对侧向阻力的影响;土壤刚度和适用性评估;荷载循环和阵风荷载的影响;侧向、垂直和扭转荷载之间的相互作用;以及场地特征问题。调查方法可包括现场测试、数值和分析建模以及土工离心测试。

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.