To study the influence law of Geogrid's effects on the stiffness of grave cushion, cushions of nine different kinds are designed and are carried out static load test of model respectively. The effects of different thickness of cushion layer, different geogrid layers and different laying position of gravel cushion layer on gravel cushion and reinforced grave cushion modulus of deformation are analyzed through the experimental results. Results show that, under other fixed condition, modulus of deformation of grave cushion is bigger than that of pure grave cushion layer, and the modulus of deformation of thinner layer of grave cushion is increased much higher; modulus of deformation of the gravel cushion layer of geogrid is increased along with the thinner layer, added gravel cushion layers of geogrid and the move up of the position; the effects of the location of geogrids on cushion modulus of deformation decreases with the increase of the grating layer. Research results provide a referential basis for the optimization design for reinforcement pads in composite foundations.
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