路基下穿京沪高铁基坑防护施工技术研究

Research on Construction Technology of Foundation Pit Protection of Subgrade under Crossing Beijing-Shanghai High-speed Railway

结合徐盐铁路动车下行线路基下穿京沪高铁基坑防护技术展开研究,阐述了徐盐铁路动车下行线路基下穿京沪高铁基坑防护的施工方法,因京沪高铁属繁忙干线,行车密度大,安全风险高,且施工地段地质为粉砂土,地下水位高,采用花管注浆加固既有桥墩周围土体,钢板桩接长插打基坑防护施工工艺为今后同等条件下穿繁忙干线施工提供了一些可借鉴的经验。

Based on the research on the protection technology of the foundation pit protection of the Xuanyan railway subgrade under crossing Beijing-Shanghai high-speed railway,the construction method is expounded.Because the Beijing-Shanghai high-speed railway is a busy trunk line,the traffic density is high,the safety risk is high,the geological area of the construction site is silty sand,and the groundwater level is high,the soil around the pier is strengthened by the pipe grouting.Construction technology for protection of steel sheet piles with long inserted foundation pit provides some lessons for the construction of busy trunk lines under the same conditions in the future.