When incorporating a footing 'key' into a cantilever retaining wall footing, is it appropriate to increase the coefficient of friction to a 'soil/soil' interface value as opposed to the 'soil/concrete' value for sliding reisitance? If so, what is a reasonable value to use, (tangent of soil friction angle, phi)? Also, if using the higher coefficient, should it only be applied to the area 'behind' the key while using the 'soil/concrete' value for the area in front of the key?
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