Some major karst–induced failures are discussed that occurred worldwide FEM simulation, using simplified models, showed that karstic processes under robust raft footings could build up to reach the footing periphery i.e., the more robust were the footing the greater could be the sinkhole. A footing reinforces the ground and stops a sinkhole outside right on the periphery of the structure footprint. Photos of actual sinkholes and FEM simulation graphs are given to support these statements.

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