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Passive Resistance for Mat Slabs
RISAFoundation includes the added ability to enter a passive pressure for slabs. The passive pressure represents soil pressure along the perimeter...
While RISAFoundation has a Default soil properties (Subgrade Modulus and Allowable Bearing), it is possible to create regions of varying soil properties.
This can be achieved by applying additional Soil Regions to your model. Simply select Soil Regions from the Insert menu, enter in the differing soil properties, and draw in the region. When completed the soil region will be displayed in orange.
Please also note that a Soil Region may be used to model a location where there is no soil resistance. For example, if you have a portion of your foundation that does not bear on the soil, you can use a Soil Region drawn under that portion to model the gap. Simply set the Subgrade Modulus to 0 and the Allowable Bearing Pressure to something very small (since the program will not allow a zero input):
Gross and Net Soil Pressures
In RISAFoundation, the Allowable Soil Bearing value is controlled by the Soil Region. This value is always taken as a Gross allowable soil...
Soil Overburden on Mat Slab
RISAFoundation can apply soil overburden to a mat slab to account for the weight of the soil above the foundation. Simply enter a Soil Overburden...