铁路增二线台后路基防护技术比较

在铁路增建二线方案拟定中，线间距的大小对全线的投资、占地产生重大影响。而线间距的确定主要由新桥基础开挖后是否能保证既有桥台后路基的稳定来决定。因此，在保证桥台后路基稳定的前提下，采用安全、合理的防护技术措施，来减少线间距，便显得尤为重要。以同煤线旧高山大桥台后路防护为例，分析既有线台后路基防护数种方法的技术经济性，旨在为其他类似项目提供借鉴。

Technical comparisons in railway added second line of subgrade protection

In the process of studying out a scheme of constructing an added second line, the distances between lines would affect a lot to the investments and land occupation of the whole line. The determination of the distances between lines is determined by whether new bridge bases can hold the stability of the subgrades beyond abutments. Thus, it seems particularly important to adopt safe and reasonable protection methods to reduce the distances between lines under the premise of assurance of the stability of the subgrades beyond abutments. This paper takes Jiugaoshan Bridge of Tongmei Railway as example, analyzing technology and economy of several methods of existing railway subgrade protection, and provides references for other similar construction projects.