基于变形状态控制的高速铁路路肩桩板墙设计探讨

Design of High Speed Railway Shoulder Sheet Pile Wall Based on Deformation State Control

桩板墙桩基锚固段微小的侧向变形极易增大墙后路基工后沉降,影响高速铁路正常运营,甚至可能引发重大安全事故。为研究高速铁路无砟轨道路肩桩板墙设计方法,结合贵广、成渝高速铁路建设,文章开展了离心模型试验、三轴试验、现场测试及理论分析。研究结果揭示了桩板墙桩锚固段位于土层内的位移时间效应、变形阈值,明确了桩前地基土变形状态强度参数的确定方法,提出了基于变形状态控制的高速铁路无砟轨道路肩桩板墙的设计方法及控制标准。研究结果可为高速铁路路肩桩板墙设计提供参考。

The post-construction settlement of the subgrade will be increased by the small lateral deformation of the anchorage section of sheet pile wall,which may affect the normal operation of high-speed railway,even lead to major safety accidents.To study the design method of shoulder sheet pile wall under the condition of ballastless track on high-speed railway,combined with the construction of Gui Guang and Cheng Yu high-speed railways,centrifuge model test,triaxial test,field test and theoretical analysis were carried out.The results reveal the displacement time effect and deformation threshold of sheet pile wall anchor section located in soil layer.The method of determining the strength parameters of deformation state of pre-pile foundation soil was defined.The design method and control standard of shoulder sheet pile wall of ballastless track for high-speed railway based on deformation state control was proposed.The research results can be used as a reference to shoulder sheet pile wall design of high-speed railway.