Mattress foundations using geogrid are often used to improve the supporting capability of a soft soil
foundation. It is known that the vertical load applied on the geogrid-mattress foundation is transmitted to the supporting
foundation with a wider area, therefore providing the supporting foundation with greater supporting capability. In order
to examine particularly the characteristics of the vertical stress distribution under the geogrid-mattress, a series of experiments was carried out, in which the geogrid-mattress thickness and the vertical stiffness of the supporting
foundation are considered to have some influence on the stress distribution. It is shown that the choice of the geogridmattress thickness is important in improving the overall supporting capability and it is desirable to design a geogrid
mattress foundation in accordance with the degree of the vertical stiffness of the supporting foundation underneath.
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