analysis of the sliding failure form of soil mass under the bearing push-extend
reamed of Push-extend Multi-under-reamed Pile, in the paper, the law of coulomb-Mohr
is used to establish a stress function and the theory of the sliding line is
used to establish Prandtl regional stress field, which determines the stress
calculating mode of soil mass and provides a theoretical basis for a further
study of this type of pile ultimate bearing capacity of soil mass.