Abstract
This study focused on excavating force by a narrow soil cutting blade. Excavation test was performed to measure the excavating forces, and the experimental results were compared with the excavating forces estimated by geometric models proposed previously. The estimated error was up to 860%, which was caused by failure patterns. To modify the previous model, the failure patterns were quantified by representing the patterns as the size of the aggregates of disturbed soil. Considering a relationship between estimated error and the size of failure region, the estimated error was within 76%.
