Chap. 24 Pile Supported and Pile Enhanced Mats
24.1 Describe a typical structure and subsurface conditions where a pile supported or pile enhanced
mat should be considered.
Solution
• The structure is too heavy, or the soils are too weak or compressible to use a conventional
24.2 A cylindrical tank, 150 ft in diameter, is to be supported by a pile enhanced mat. The loading on
the mat is a combination of the dead load of the tank itself, the live load of the tank contents, as
well as other loads. Using a sketch, suggest a possible arrangement of the piles and explain the
reasoning behind your design.
Solution
Loading = D + L
Place 3 ft. diameter piles 12 ft on–center across the 156 ft diameter of the mat. The dead
and live load will typically be evenly distributed.