Numeric simulation of the grouting system is done based on the stress analysis,and the stirring characteristics are analyzed based on the result of simulation.

The effect factors on the bearing capacity of reinforced mixing pile was discussed and simplified.

According to experiences of its design,field experimentation and construction,this paper discusses the failure mode of the reinforced mixing pile,and brings forward the optimization design method of the reinforced mixing pile,which could provide a reliable basis for the design and construction of the reinforced mixing .

By analyzing the stress and deformation of the reinforced mixing pile with different concrete core pile length and area replacing ratio in soft soil, it is expressed that the core pile shaft friction undertakes the mass of vertical load of the pile and a little of it can transmit to pile top, it is also founded that an optimum core pile length and an area replacing ratio of the reinforced mixi.

Static and dynamic analysis of bearing capacity of composite foundation of concrete core mixing piles;

Study on seismic behavior of a compound foundation with concrete core mixing pile;

The concrete core mixing pile is a new soil improvement method.

Effect on mixing uniformity to load of deep mixing pile;

Based on the analysis on the dynamics and the cutting & mixing mechanism,the paper explained that the main factors which effect mixing uniformity of deep mixing pile body are the horizontal rotary velocity of the blade and the vertical motion,and analysis was also made on the effect of structure of stirrer to mixing uniformity.