Publication news

Reduced testing and modelling of the bearing capacity of rooted soil for wheeled forestry machines

Abdurasul Pirnazarov, Ulf Sellgren  
Journal of Terramechanics, Volume 60, August 2015, Pages 23-31, ISSN 0022-4898,
The next generation of forestry machines must be developed to be gentler to soil and to the root mat than present machines, especially in thinning operations. The bearing capacity of the soil is a key property for determining the terrain trafficability and machine mobility. This asks for better and more general terramechanics models that can be used to predict the interaction between different machine concepts and real and complex forest soil.

This paper presents results from terramechanics experiments of rooted soil with a new and small-scale testing device. The force–deflection results are analyzed and compared with analytical root reinforcement models found in literature. The presented study indicates that rooted soil properties obtained with the new laboratory test device can be used to create an augmented soil model that can be used to predict the bearing capacity of rooted soil and also to be used in dynamic machine–soil interaction simulations.
Keywords: Bearing capacity; Forest soil; Root reinforcement; Shear resistance