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Abstract:
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The practice has shown that dynamic loadings are numerous, but there are only two types of reaction on the foundation soils: 1) active reaction due to direct cycling impact from the foundation machine, pile driving etc., 2) passive reaction due to the seismic effect from earthquakes, from transportation vehicles etc. Based on the analysis of the elastic, elastic-plastic and linear vibration theories, results of the study on the change of soil physico-mechanical parameters under the impact of the dynamic loadings 4,7,9,12 and based on the point of view of discrete medium dispersion system 15,21, this work had clarified the dynamic strength through dynamic cycling strength-characteristic seismic extreme dynamic strength for the passive and active reactions of the foundation soils. Simultaneously, mathematical expressions of the characteristic coefficients of various types of dynamic shearing strengths are presented and method of their determination is proposed. |