滨海软土地区邻近高速铁路河道开挖、道路拆改建工程技术方案研究
Research on the Technical Scheme of River Excavation and Road Demolition and Reconstruction of High-Speed Railway Adjacent to the Coastal Soft Soil Area

高速铁路运营时，要求轨道结构具有既持久又稳定的平顺性，这就对线下结构的工后沉降提出了非常苛刻的要求。文章结合某滨海软土地区下穿铁路的道路拆改建、并行铁路的河道开挖，对工程实施方案进行了探讨，提出对地基、坑底采用水泥搅拌桩加固，台后采用轻质泡沫混凝土回填的方案，结合有限元分析、现场实测数据，说明本工程方案的可行性，较密打隔离桩可以节约造价、缩短工期。文章的研究成果，可以为同类条件下的工程设计、施工提供借鉴。
The operation of a high-speed railway requires the track structure to have both durable and stable smoothness, which puts forward very demanding requirements for the post-construction settlement of the off-line structure. This paper discusses the implementation plan of the project based on the demolition and reconstruction of the road passing through the railway in a coastal soft soil area and the excavation of the river channel of the parallel railway. The scheme of cement mixing piles for the foundation and pit bottom is proposed, and the backfilling of lightweight foam concrete behind the platform is proposed. Combined with finite element analysis and on-site measurement data, the feasibility of this engineering scheme is verified, and the dense boring of isolation piles can save costs and shorten the construction period. The research results of this paper can provide a reference for engineering design and construction under similar conditions.