The mechanical characteristics are analysed based on compression test

shear test

tensile test

extraction test of soft soil reinforced by geogrid. Through laboratory model tests

the following studies are performed: the lateral and vertical displacement of the variation with depth

displacement field

stress field

strain field of the foundation reinforced and non-reinforced by geogrid. The results show that it is feasible to change and to resist the formation and development of plastic zone; the influence of reinforced cushion to spread and even up distribute stress of soft soil of substratum

and as well the role of geogrid

to control plastic deformation

to strengthen ductility and stiffness

to decrease lateral and vertical displacements

to strengthen shear strength of soft soil foundation

to improve the stability of the foundation and bearing capacity of reinforced soft soil; the study provides reliable basis for engineering applications.