Abstract :
Inhomogeneousfrozenandstrongsoilssignificantlyreducethelifecycleof the cutting tool of trenchers due to an increase in the average maximum soil resistance during cutting and an increase in contact pressure at the wear site. The paper presents an approach to determining the resistances at the site of wear of the cutters, which allows taking into account the effect of gravel-pebble inclusions on the strength of the cutting tool with the necessary accuracy. Various types of interaction of the cutter with gravel-pebble inclusions are considered. It is shown how the frequency of interaction of the cutter with inclusions is related to the size of these inclusions. The results of experimental studies to determine the pressure at the wear site and the coefficient of resistance to movement of the wear site of the cutters depending on the presence of gravel and pebble inclusions in the soil are presented. An estimate of the convergence of the obtained dependences with experimental data is presented.
Keyword :
trencher, frozen soil, gravel and pebble inclusions, cutting process, the interaction of the cutter with the inclusions, wear area of the cutter.