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And here's one possible solution to bad engineering. Here you can see a picture from a project to make the Port of Oakland less likely to fall apart in an earthquake. Boulanger explains:
The grid of soil-cement columns is exposed at this location. The piles within the grid will support a wharf that is being constructed. The grid of soil-cement walls extends down through soft soils into harder, competent soils, and acts to increase the stability of the channel slope.
