400km/h高速铁路路基设计主要技术标准探讨

Discussion on Main Technical Standards for Earthworks Design of 400km/h High-speed Railway

本文结合成渝中线高速铁路(预留400 km/h提速条件)设计研究,通过对列车动应力影响范围的理论分析,从路基面宽度、基床结构、材质及压实标准、荷载大小及分布模式、工后变形控制标准、过渡段、路肩支挡工程等方面论述了400 km/h条件下的路基主要技术标准,分析了350 km/h高速铁路与400 km/h高速铁路路基设计的迥异点。结果表明:在路基面宽度、基床厚度和沉降标准等方面,两者设计标准基本一致;而在动应力影响下,两者在路基面荷载大小及分布模式、基床结构及材质、过渡段和路肩支挡工程等方面存在差异。

Based on the design research of the Second Chengdu-Chongqing High-speed Railway(400 km/h speed-up condition is reserved),this paper elaborates on the main technical standards of earthworks at speed of 400 km/h by using the theoretical analysis of the scope of the impact of train s dynamic stress from the aspects of the width of track formation,the structure of the base course and subbase course,material and compaction standard,load size and distribution mode,post-construction deformation control standard,transition section,and shoulder supporting,and analyzes the differences of the earthworks design between the 350 km/h high-speed railway and the 400 km/h high-speed railway.The results show that the design standards for both speeds are basically the same in terms of the width of track formation,the thickness of the base course and subbase course,and settlement standards.However,under the impact of dynamic stress,there are differences in the size and distribution pattern of earthworks surface load,the structure and materials of the base course and subbase course,transition section and shoulder supporting,etc.