Study on the Composite Foundation with Cement-Flyash-Gravel Pile

According to the laboratory and in situ tests, this paper discusses into the roles Of the mattress of compositefoundtion with cement, fly-ask, gravel pile （CFGP）, the bearing ratio of CFGP to soil under the vertical loads, and thedeformation behaviour of the compsite foundation. The Paper also sets forth the design ideas of CFGP composite foundationand the rdevant maculating method.