Which foundation method combines both bearing capacity and settlement considerations in substation design?

The grillage foundation method is particularly effective because it addresses both the bearing capacity and settlement considerations crucial in substation design. This type of foundation utilizes a system of beams or girders arranged in a grid pattern, which provides a good distribution of loads from the structure above. This characteristic makes it ideal for managing the weight of transformers and other heavy equipment typically found in substations.

In addition to its load distribution capabilities, the grillage foundation can be designed to accommodate various soil conditions, which is essential for minimizing settlement issues. By spreading the weight over a larger area, the grillage reduces the risks of differential settlement that could affect the structural integrity of the substation. This dual focus on stability and durability is what makes grillage a preferred choice in contexts where both bearing capacity and settlement are significant concerns.

Other foundation methods, while they may focus on either bearing capacity or settlement, do not offer the same balance as the grillage system does in terms of addressing both aspects comprehensively. For example, slabs on grade primarily work well in stable soil conditions but may not adequately address potential settlement issues in less stable soils.