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Forestry vehicles meet different kinds of soil resistance when operating on forest soils, which include the rolling resistance, as well as the resistance to vehicles turning. The purpose of proposed study is to present dependencies for estimating the soils resistance to forestry vehicles? turning, based on solution of theoretical problem of indenter pressing into a soil massif of unlimited thickness of the deformable layer. The study bases on theoretical methods of terramechanics, methods of computational experime...

The study aims to estimate rut depths components caused by soil compaction and its? shearing caused by forestry vehicles? impact. The study bases on theoretical methods of terramechanics. As a result of the calculations, the study estimates three components of the rut depth caused by wheeled and bogie-tracked forestry vehicles impact. In the case when wheeled forestry vehicles operate on a weak forest soil which bearing capacity is up to 0.04 MPa, the estimate of the rut depth component caused by the soil shear ca...

The aim of the article is studying relationships of soil pressure of forestry machines, determined within different methods. Research methods include computing experiment and calculated data processing. The article analyzes three different methods for calculating the soil pressure, including analytical method for calculating average contact pressure, method for calculating the pressure on a rigid surface, and nominal ground pressure method. Basing on the computing experiment results, the study establishes linear r...

The purpose of this article is development of systemized recommendations for assessing impact of logging machines on forest soil, basing on which one can consider eligibility of a particular machine for given soil conditions. Research methods include mathematical analysis, numerical methods for solving equations, computing experiment and methods for calculated data processing. The study uses soil compaction and rut depth, consisting of the compaction and soil shear, as the main indicators of the impact. The main s...

The paper aims on obtaining dependences linking peatland and forest soil cone indices and the soils? deformation moduli. The research obtains results basing on experimental data on the mechanical properties of peatland and forest soils and theoretical dependences of contact mechanics. The paper uses methods of calculated numeric data fitting. The study obtains dependences of mechanical properties (inner cohesion, angle of internal friction, the shear modulus) of forest and peatland soil on the deformation moduli. ...