Failure pattern of buttress retaining wall and counterfort?

The failure patterns of buttress retaining walls and counterforts typically involve structural instability due to inadequate resistance to lateral earth pressures, hydrostatic forces, or poor drainage. In buttress walls, failure may occur if the buttresses are improperly spaced or not adequately anchored, leading to sliding, overturning, or bending. Counterfort walls can experience similar issues, with additional risks of cracking or shear failure at the connection points where the counterforts meet the wall. Proper design, drainage, and soil analysis are crucial to mitigate these failure risks.