Field Measurements on the Response of Anchor Trees to Dynamic Cable Tensile Forces in Single and Multiple Anchorage Configurations

This research project deals with the dynamics of tree anchors used to secure skylines and guy lines of cable-based yarding systems. The holding capacity of these anchors is crucial for work safety and efficiency, yet it is difficult to estimate due to its high variability. Current monitoring approaches rely on measuring tree movement. A particular focus is placed on multiple-anchor configurations, where two or more trees are combined. In such cases, assessing holding capacity becomes even more complex, and scientific knowledge is lacking regarding the distribution of dynamic forces—especially when using haul-back or diversion pulleys. Using high-resolution measurement systems, the project will record force distribution and tree responses under realistic working conditions. The study will examine both direct cable configurations and setups involving diversion pulleys. The results will provide key parameters for future monitoring systems, create a basis for calculation tools, and support the development of training materials.