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V. Pareto principle 80/20 (1897), generalized by J.M. Juran (1941), reads “80% of effects are due to 20% of causes, 80% of causes generate 20% of effects”. Site survey data scatter, idealization of soil and soil-footing interaction make conservative decisions inevitable in geotechnical engineering, because the cost of risk is very high. The way to control this conservatism is to evaluate and to rate qualitative regularities of Soil-Footing-Structure System (SFSS) behavior by means of computer simulation of simplified SFSS virtual models. About 10,000 numeric experiments were carried out and 40,000 diagrams of results were obtained for the whole practical range of input data. The results were rated for 84 input-output data pairs (cause-effect) and tabulated (Table 1). Some of the these pairs show that the output result is very sensitive to variations of the input parameter, and such pairs were rated 2, if such influence is negligible, than the pair was rated 0 and may be ignored, the intermediate cases were rated 1. It was shown that the overall Pareto ratio is close to 80/20.
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