Ground interaction is considered using springs which only work in compression.
They are modeled as chains of mass points having ground interaction via spikes which make the velocities unidirectional.
The tunnel-ground interaction is considered by introducing Pasternak two-parameter foundation, which is able to further take account for the interaction between adjacent springs.
To evaluate the nature and strength of interspecific interactions between maize and potatoes, field and pot experiments were conducted using the 'target' technique, with three interaction models: no interaction (NI), below-ground interaction (BI) and full (both above- and below-ground) interaction (FI).
Therefore, the increase in P1 principal compressive and shear bone strains associated with restricted foot slip indicate that alterations in foot:ground interaction may play a role in fracture occurrence in horses.
Due to advances in numerical modelling, it is possible to capture complex support-ground interaction in two dimensions and three dimensions for mechanical analysis of complex tunnel support systems, although such analysis may still be too complex for routine design calculations.
Biological terrestrial locomotion occurs on substrate materials with a range of rheological behaviour, which can affect limb-ground interaction, locomotor mode and performance.
However, knowledge on specific interactions in field conditions, especially below-ground interactions, is deficient.
As such, the LED-test provides a novel way to quantify the capability of the lower extremity to regulate dynamic and unstable foot-ground interactions at submaximal forces.
Moreover, tunnel-ground interactions are commonly considered through the Winkler foundation model, which is unable to account for the interactions of adjacent springs and leads to overestimations of shear forces and bending moments in shield tunnels.
