In order to study the settlement calculation method of rigid pile-geogrid composite foundations under loading of high-speed railways,the Mindlin-Boussinesq uniting solution was used to calculate the inter-pile soil additional stresses,and the settlements were calculated with the e-lgp curve method.The calculation results were analyzed comprehensively and compared with the results of the existing composite foundation settlement calculation method and the data measured in site.The research results show as follows:Limitations exist with the existing methods of calculating settlements of rigid pile-geogrid composite foundations under subgrade loads and settlements of soil mass of over-consolidated and strongly structured foundations; the law of distribution of inter-pile soil additional stresses along the depth of the rigid pile-geogrid composite foundation,acquired by the Mindlin-Boussinesq uniting solution accords with the actual engineering distribution; settlements calculated with the e-lgp curve method are relatively close to the data measuremed in site,which take into consideration influence factore such as setting of parameters of the rigid pile-geogrid composite foundation and stress history of foundation soil.%为研究适合高速铁路荷载作用下刚性桩桩网复合地基沉降计算方法,采用Mindlin-Boussinesq联合求解桩间土的附加应力,根据e-lgp曲线法计算地基沉降的方法对高速铁路刚性桩桩网复合地基进行沉降计算,并与现有复合地基计算方法及现场实测数据进行对比分析.计算结果与研究分析表明:现有规范采用方法对高速铁路路基荷载作用下刚性桩网复合地基,及超固结或结构性较强的地基土体沉降计算有所局限；Mindlin-Bouss-inesq联合求解刚性桩复合地基中桩间土的附加应力沿深度的分布规律符合实际工程分布情况；Mindlin-Bouss-inesq联合求解附加应力并根据e-lgp曲线法计算地基沉降方法的计算沉降值与实测值较接近,并能考虑刚性桩复合地基设置参数情况及地基土应力历史等影响因素.
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