Lytvynenko T. The compaction of road embankment soils by ensuring their long-term strength

The object - compaction of road embankment soils; purpose - optimal compaction criteria of road embankment soils improving, which provide their long-term strength; methods - classical and nonlinear soil mechanics; optimal soil compaction parameters determination; normative laboratory methods of physical and mechanical soils properties research with their statistical processing data; mathematical statistics for experimental results processing; FEM simulation for the soil compaction; novelty - by the laboratory and field tests results new research patterns of water migration in compacted silty loam embankment, including the stabilized (or final) clay soil moisture values, depending on their type (number plasticity), soil skeleton density, embankment height and time "rest" of the subgrade before it's operation are obtained; optimum compaction criteria of silty loams, which provide road embankment long-term strength is improved, namely to compact the soil with moisture close to the maximum quantity of unfree water; FEM modeling new correct conditions of clay soils compaction process in physically and geometrically nonlinear formulation of clay soils multilayer consolidation being a part of road embankments are established, in which the designer gets soil skeleton density and its deformation module; results - it is found that for continuous road embankment service it's necessary not only to achieve maximum values of it's soil skeleton density and strength, but also to save them during continuous service time; on the condition of compacted soil over time significantly affects moisture at which it compacted, and the proportion of water certain types in this soil; so the compaction design process of clay soils road embankment at the long-term strength is reduced to the parameters determination that allow to compact the soil at maximum possible skeleton density at moisture, close to maximum quantity of unfree water; optimum moisture for silty loams multilayer consolidation depending on soil skeleton density design value and number plasticity is determined; industry - building