Inquiring into the settlement calculation of multi-pile composite foundation;

Reliability analysis of bearing capacity of multi-pile composite foundation;

Laboratory experiment of multi-pile composite foundation of steel pipe column and sand column;

Stress ratio between piles and soils of multi-element composite foundation;

Based on the loading test data of rigid-flexible piles in multi-element composite foundation,the changes of the stress on pile-top and pile-end of rigid and flexible piles with changes of the applied loads,and the load transfer rules of rigid piles is discussed.

The foundation researching the capacity of multi-element composite foundation is very importment for designing.

Application of multi element composite ground in groundwork processing of drainage culvert;

The concept and classification of multi element composite ground are put forward at first,then the computation methods of bearing capacity and settlement,and the test method of multi element composite ground are also presented in this paper.

As composite foundation with multi?element pile,the under?rammed bored pile,which composites the cast?in?place pile in upper part and the rammed bulb pile in under part,is used in an engineering by combining with the rammed and compacted lime?waste?soil pile.

Tests on the mixed bacteria in the mixed system containing multifactor substrate show that since there is no antagonism among strains C-14-1,C-14-2 and J-13-1,they can be mixed and applied together.