Acombined fbundation method consists ofsmall size steel pi [ es and compact − ed gravel on theし op of those piles is proposed as fbundation works for residential buildings 、 A series of 巨e! d tests are conducted to c! arify the structural behaviQr ef such fl )undation system , and the spring constants used in design caloulation are studied 、 Tested parameters are the diameter of steel pile and the thickness of compacted gravel . In generaL. the ultimate bearing capacity of the specimen becomes large with the increase of 出e diameter and the thickness , As a result , well compacted gravel with the thickness more し han 50mm realize a rational structural design , reducing the stress concentration in
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