By the construction example of garbage extruding pile impacted and rammed by a heavy hammer, the method is analyzed and some suggestions are put forward.

The composite foundation formed by CFG pile and drilling ram expanded pile (DRE pile) which used widely in Beijing area are applied to a project, using CFG pile to minimize the building settlement and DRE pile to improve shallow soil bearing capacity respectively.

According the project practice, the method of adopting the local natural grit as the meterials of the enlarged compaction pile by tamping is put forward, the process and the main construction points of the method is introduced, the quality requirements is emphasized.

according to the successful application of Down Drilled Hole Dynamic Compaction composite pile on high-rise buildng foundation,the method of design and construction of this kind of composite foundation are expatiated.

Equal energy,equal deformation tamping and expansion gangue pile is a new strengthening method,which not only has the effect of tamping and expansion,but also strengthens complex earth-fill.