The cooling efficiency with forward diffused holes is superior than that with cylindrical holes,because of the jet flow expands wider along the span,and with a high efficiency at the lateral area between adjacent holes.

According to Mohr-Coulomb failure criteriont,he stress-strain-volume change relationshipst,he volume balance and energy conservation equations,and the rules of large deformation and non-associated flow under high stresses,the limit bearing capacities of cavity expansion are given considering the large deformation and dilation with volumetric change and large deformation,respectively.

The stress distribution due to the cavity expansion is considered as three zones, the first is failure zone, the second is plastic zone and the third is elastic zone.

In this paper,the stress distribution due to the cavity expansion is considered as three zones,the first is failure zone,the second is plastic zone and the third is elastic zone.

In view of the vertical subsidiary stress and the theory of expansion of cavity,this paper exams the stress between the anchor jacked pile and the soil around it,and the properties of the soil as well.

place tubular piles are analytically analyzed by making use of cylindrical cavity expansion theory,and by comparison with general piles,its superiorities in respect of disturbing soils are displayed.