Two-layer ground draught definition under logging machine passage

A method to strengthen skid trails with logging waste to reduce environmental damage to soil and ground caused by the logging machine passage is well known. However, exciting models of machines and forest soils’ interaction do not adequately reveal the impact of differences in physical and mechanical properties on the logging waste layer and cutting area of the soil layer. The depth of its change caused by compression after machine’s passage is not disclosed eihter. The paper considers interaction between two layers: a layer of shredded logging waste (top layer) and the soil layer of cutting area (bottom layer). Further, we describe a model of rutting that explicitly takes into account the effect caused by differences in physical and mechanical characteristics of the base layers and the change in soil characteristics after machines’ passage. The algorithm calculating the gauge depth after machines’ multiple passages is discribed. The article ends with an example of the rut depth calculation model for 25 machine passages. The study involves cases with variable volumes of pressure exercised by logging machines on the base and thickness of the logging waste layers.