Piles with negative skin friction
I am currently a student and doing an assignment based around concrete pile design. I am required to calculate the number of circular concrete piles required to support a concrete effluent tank. When the tank is full the ground is in compression. However, when the tank is emptied (periodically for maintenance purposes) the effective stress in the ground becomes negative (-5.24kN/m^2). As part of the assignment I am asked to consider what possible design requirements need to be made when designing the piles to take account for the ground (uniform clay) being in both compression and tension at different times. Does anyone have any information that might help, know any sources that might help or have any hints for research topics? Cheers for any help you can give.
