English：

In practice, soil mixing piles generally have non?uniform strength, large disturbance and are vulnerable to anthropic factors. To tackle these problems, a digital minor?disturbance four?axial soil mixing pile technique is newly developed. The four augers are able to inject cement slurry and compressible air simultaneously, cutting the soil around them with the help of multiple?layer blades and drilling and withdrawing conversion grouting technique. In this way, the soil and cement slurry can be mixed uniformly. By the aid of special shaped shaft and automatic controlling of slurry and air pressure, construction disturbance is reduced. The field test results show that four?axialsmeet the strength requirements of can be 0.8MPa at a cement content of 13% ~ 15% in weight, and the influence of pile construction is minor.