Subgrade settlement is a complex process, and the factors that effect and restrict subgrade settlement couldn't be considered completely by general one-dimension consolidation theory, so the calculated value and the measured value of subgrade settlement often have great difference. However, to the subgrade settlement, there are extremely strict controlling requirements in relevant high-speed railway codes. In this article, based on the settlement values measured at the pile-raft composite foundation in Jinan West Railway Station of Beijing-Shanghail High-speed Railway, grey system theory is used to analyze the settlement process of the pile-raft composite foundation so as to find a suitable analysis method for the pile-raft composite foundation settlement under the condition of large-area load and provide scientific basis for the subgrade construction of the high-speed railway station and yard.%路基的沉降过程非常复杂,常规的一维固结理论不可能考虑到影响和制约路基沉降的所有因素,因此计算得到的路基沉降值往往与实测值有很大差距,而高速铁路对路基沉降的控制要求极其严格.基于京沪高铁济南西客站桩-筏复合地基的实测沉降值,运用灰色系统理论分析桩-筏复合地基的沉降变化过程,寻求一种适合大面积堆载情况下桩-筏复合地基沉降的分析方法,为我国高速铁路车站站场基础的建设提供科学的依据.
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