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为研究高速铁路地基差异沉降在路堤中的传递扩散特性,运用有限元方法,分析了路基在小变形条件下地基差异沉降与路基面不均匀变形的映射关系,并在得到土工离心模型试验校正的基础上,讨论了地基差异沉降模式、路堤高度等因素对路基面不均匀变形的影响规律.研究表明:地基差异沉降在路堤中的扩散程度随地基差异沉降渐变段长度与路堤高度比值的增大而减小,比值大于3~5以后,地基差异沉降与路基面不均匀变形具有良好的一致性;路基面不均匀变形与地基差异沉降呈正相关性,并随路堤高度、地基差异沉降渐变段长度的增加而减小;基于路基面不均匀变形限值提出了地基差异沉降控制标准,丰富了高速铁路路基沉降变形控制技术指标体系.
In order to study the transmission and diffusion characteristics of differential subsidence of high-speed railway in embankment, the mapping relationship between subgrade differential settlement and subgrade uneven deformation of subgrade under small deformation is analyzed by finite element method. After corrected by geotechnical centrifuge model test Based on the discussion, the influence of subgrade differential settlement mode and embankment height on the uneven deformation of roadbed is discussed.The results show that the degree of diffusion of foundation subsidence in the embankment increases with the ratio of the length of gradual change subsidence and embankment height But the difference between foundation subsidence and nonuniform deformation of subgrade is in good agreement. The uneven deformation of subgrade is positively correlated with the differential subsidence of subgrade, and with the embankment height, the length of subgrade gradient subsidence Based on the uneven deformation limit of the roadbed, the paper puts forward the control standard of differential subsidence foundation, which enriches the index system of the subsidence deformation control of high speed railway subgrade.