无碴轨道路基关键技术探讨——以遂渝线无碴轨道综合试验段为例

研究目的:为适应我国客运专线建设的需要,铁道部组织开展了遂渝线无碴轨道综合试验,铁道第二勘察设计院联合西南交通大学等单位承担了遂渝线无碴轨道线下工程关键技术研究。研究方法:主要研究内容包括:(1)无碴轨道路基基床动力学特性试验研究;(2)地基沉降控制技术试验研究,其中重点研究桩-网结构路基和桩-板结构路基;(3)红层泥岩填料填筑无碴轨道路基适应性研究;(4)无碴轨道线下基础刚度匹配技术研究。本文结合遂渝线无碴轨道综合实验段路基工程试验研究和设计施工,就如何有效控制地基沉降、线下基础纵向刚度匹配、合理使用非良质填料三个客运专线无碴轨道路基关键技术问题进行探讨。研究结论:提出桩-网结构路基、桩-板结构路基适用条件及设计方法,提出路基面支承刚度及其设计应用,提出合理使用非良质填料的建议意见,并对客运专线无碴轨道路基设计、施工的关键问题进行了讨论。

Exploration on Key Technology of Ballastless Track Subgrade——A Case Study of Comprehensive Experimental Section of Ballastless Track on Suining- Chongqing Line

Research purposes:The comprehensive experiment of ballastless track on Suining-Chongqing line is carried out for the need of passenger traffic special line.The research work of key technologies of ballastless track under-rail engeering,which is carried out by the second survey and design institution of railway and Southwest Jiaotong University.Research methods:The main research contents include:(1)the experimental research of dynamic characteristics of subgrade bed of ballastless track;(2)the experimental research of techniques against foundation settlement which focuses on pile-net subgrade and pile-plank subgrade;(3)the research of rationality of using red beds as fillings for subgrade of ballastless track;(4)the research of stiffness matching of under-rail foundation of ballastless track.In this paper design and construction of subgrade in comprehensive experimental section of ballastless track on Suining-Chongqing line based on the experimental research,three key technologies of ballastless track subgrade of passenger traffic special line are discussed,which include the control of foundation settlement,the longitudinal stiffness matching of under-rail foundation,and the rational use of not-fine subgrade materials.Research conclusions:The applicable condition and design method of pile-net subgrade and pile-blank subgrade,the design and application of bracing stiffness of subgrade surface,and proposals for rationally using the not-fine subgrade materials are presented.