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在软土地基上进行长距离建筑物移位时,地基加固设计直接影响着建筑物的安全和工程造价。如何获得既满足沉降控制标准又能达到经济效益最优的地基加固方案,成为该类工程的主要技术问题。依托龙溪塔移位工程,分析了软土地基上移位工程的控制标准,并采用E.Winkler弹性地基梁法对复合地基加固后的轨道梁的沉降变形进行验算。从控制地基及轨道梁沉降变形的技术经济角度考虑,通过调整桩间距和桩长两个参数对原复合地基加固方案进行了优化。龙溪塔的成功移位表明,在按承载力设计的基础上,采用沉降控制的优化设计可行,优化后的加固方案较原方案节约了42%的经济成本。研究成果可为今后同类工程地基加固设计及实施提供借鉴。
When long-distance buildings are displaced on soft ground, the design of foundation reinforcement has a direct impact on the safety and construction costs of the building. How to obtain the foundation reinforcement plan that meets the settlement control standards and achieves the best economic benefits has become the major technical issue of such projects. Based on the Longxi Tower Displacement Project, the control standard of displacement engineering on soft soil foundation was analyzed, and the settlement settlement of track girder reinforced by composite foundation was checked by using E.Winkler elastic foundation beam method. From the perspective of technical and economic control of settlement and deformation of foundation and track girder, the reinforcement scheme of the original composite foundation is optimized by adjusting two parameters of pile spacing and pile length. The successful shift of Longxi Tower shows that the optimized design of settlement control is feasible based on the design of bearing capacity. The optimized reinforcement scheme saves 42% of the economic cost compared with the original scheme. The research results can provide reference for the reinforcement design and implementation of similar projects in the future.