The presumptive values in the code are lower bound values of what is already a conservative approximation and should not be used for significant structures because they are excessively conservative.Ī better approach would be to seek guidance from the project geotechnical engineer, assuming the geotech has adequate foundation engineering capabilities (as opposed to just sampling and testing) to field this sort of question. It is a lumped parameter that tries to account for shear strength, deformation, and, to an extent, foundation geometry. However, what you need to understand is that allowable bearing pressure is not a physical property of the soil. More importantly, it represents a limit state condition, so it is not an allowable pressure.įor the IBC post and pole method you want to use, there are presumptive lateral bearing pressure values in Table 1806.2. It can be adapted to a pile but the theories were developed for walls. The passive pressure is the maximum pressure that can be developed on an earth-retaining structure before failing by shearing a displacing a wedge of soil. The allowable lateral bearing capacity and the passive earth pressure are very different things.
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