A Cylindrical well of external diameter 6m and internal diameter 4m i…

Question

A Cylindrical well of external diameter 6m and internal diameter 4m is sunk to a depth $16\text{m}$ below the maximum scour level in a sand deposit. The well is subjected to a horizontal force of $1000\text{ kN}$ acting at a height of 8m above the scour level. Determine the total allowable equivalent resisting force due to earth pressure, assuming that (a) the well rotates about a point above the base, and (b) the well rotates about the base. Assume $\gamma=10\text{ kN/m}^3$, $\varnothing=30^0$, and factor of safety against passive resistance = 2. Use Terzaghi's Approach.