粉土粉砂质地层地铁盾构下穿既有铁路施工技术研究

针对杭州地铁1号线秋涛路站—城站盾构区间，下穿杭州市城站火车站277 m范围内铁路设施的施工实际，在分析水文地质条件、粉土粉砂质地层以及既有运营铁路保护要求等因素基础上，通过采用科学合理的施工技术、控制措施、施工要求等，成功完成了下穿铁路施工。保证了既有铁路运营安全，很好地控制了安全质量风险，为工程优质、高效、安全提供了保障。

Study on Construction Technology for Metro Shield Underpassing the Existing Railway in Silty Stratum

Based on the construction practice of the shield interval from Qiutao Road Station to Chengzhan Station of Hangzhou Metro Line 1 underpassing the railway facilities within 277 m of Chengzhan Railway Station in Hangzhou City, the construction of underpassing railway was successfully completed through adopting scientific and reasonable construction technology, control measures and construction requirements, etc., on the basis of analyzing the hydrogeological conditions, silty stratum and the protection requirements of the existing operating railway, ensuring the operation safety of the existing railway, properly controlling the safety quality risks and providing guarantee for the high-quality and high-efficiency project.