Geotechnical design and analysis Subject:
residual soils- increase in shear strength & bearing capacity
Author: c.y. abdulla
I'd be glad if i can get answers on the following questions.
1. In firm to medium stiff residual soils, is it possible to get increase in shear strength due to placing of fill on top of the residual soils. (similar to like placing surcharge on soft clay?)
2. If a foundation i.e. footing, is placed on competent residual soils, then followed by fill surrounding the fill, can the fill be taken as contributing to the bearing capacity of the founding soils, as part of the surcharge factor?
I would think that the amount of fill required to add even a small amount of bearing capacity (not shear strength) would cost far more than simply widening the footing or increasing your shear strength parameters.
After all, how precise are the strength parameters you are using?!.