Evaluation of the strength and deformability of clay soils under loading regime, taking into account the degradation of the soil structure
Existing analytical methods for the calculation of the bearing capacity and sediment grounds not to take into account the peculiarities of stress-strain state of the soil under the simultaneous action of cyclic regime and long-term static loading, which undergoes base in the real world, which leads to a discrepancy between the estimated and actual values. The main reason for the discrepancy is that modern computational models of soils do not take into account that the process of nonlinear volume deformation in time with a combination of load cases is accompanied by complex physical and physic-chemical phenomena, changes in the orientation of the mineral particles and slip planes in space and dilatancy. In conditions of triaxial clay soils destructive processes and the process of destruction is localized to sites of limit equilibrium. Based on the results of the analysis of experimental and theoretical studies of the author assumed that the destruction of the clay soil occurs when the total length of the micro cracks in the zone limit equilibrium reaches critical limits. Micro cracks in the zone limit unstable equilibrium develops: stand infancy, accumulation submicrocracks, turning them into micro- and macro-cracks and abrupt development to the critical value. Using the calculated fracture mechanism of elastic-visco-plastic bodies, proposed equations describing the change of the basic mechanical properties of soils - specific cohesion and angle of internal friction of clay soils over time.