As a new technique,compacted crushing stone pile is now often used in treatment for coarse sand and stone foundation,because the method is of simple process,easy quality-control and fast construction rate.

Ram-compaction piles with composite bearing base is an effective method to enhance the bearing force of the composite foundation,by u- sing the high bearing force of a pile,the characteristic of the pile s short,the enhance of the substitute ratio of the composite foundation.

This paper introduces the method of controlling the driven steel tube in application of the ram-compaction piles.

As a result,the ram-compaction piles have not only higher-load but also less down moving.

Difference exists in the base height of rammed enlarged piles between the model test and the calculated test.

Application of tamping pile foundation;

In this paper the application and adaptability of compacted expanded pile in collapsible loess in west past of Henan is presented.

The mechanics characteristic of the compacted expanded pile is introduced in this paper.

This paper narrates the problems of project quality brought about in the compacted expanded pile construction for saturated silty clay soils.