阳安线路基病害调查分析及增建二线设计原则

阳平关至安康铁路全线穿越136.4km膨胀土分布区,由于建设年代早,对膨胀土认识缺乏经验,建成通车后既有线在运营过程中路堤、路堑边坡和路基基床部位不断发生病害,详细介绍沿线各种路基病害的分布段落、病害类型,从气象环境、地层岩性、大气降水等多个方面分析路基病害的形成机理。增建第二线时,避绕了易发生病害的区段,优化了二线的选线方案,通过借鉴既有线路基病害整治经验,提出了膨胀土地区路基的设计原则。

Subgrade Disease Investigation and Analysis as well as Newly-added Second Line Design Principle for Yangpingguan-Ankang Railway

Yangpingguan-Ankang Railway passes through the 136. 4 km expansive soil region. Since this railway was put into use,a lot of diseases have frequently occurred at this railway's embankment,cutting slope and subgrade bed,because this railway was built in the early days when there was shortage of the experience on how to treat the expansive soil. To solve this problem,this paper illustrated in detail the distributions and the types of the various subgrade diseases along this railway; and analyzed the subgrade diseases' forming mechanism in many aspects,such as meteorological environment,stratum lithology,rainfall,and so on. On this basis,when designing the newly-added second line for this railway,the route selection scheme was optimized in this paper so as to bypass the regions susceptible to those diseases,and then a subgrade design principle for expansive soil regions was proposed in this paper by reference to the disease treatment measures of the existing line.