A case of the long-short-pile composite foundation in liquefied soft soil under a 30-storey tall building is presented,in which the long and short piles are made of cement-flyash-gravel(CFG) and lime.A new design calculation method of the bearing capacity and settlement of composite foundation is introduced,and the calculated value is compared with the actual measurement.The results show that the liquefaction of soft ground is eliminated and the demand of load and settlement for upper building is met.At the same time,it is proved that the design method is feasible.%介绍了长短桩复合地基在一栋30层的高层建筑液化地基处理中的应用实例.长短桩由水泥粉煤灰碎石桩(CFG桩)和二灰桩组合而成.提出了复合地基承载力与沉降的设计计算方法,并且把承载力与沉降的计算值与实测值做了对比.结果表明,这种方法消除了地基的液化现象,满足了上部结构对地基承载力和沉降的要求,说明该计算方法是可行的.
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