The Calculation of Passive Earth Pressure for Flat Cutting Blades in Cohesive Soils (Part 2)

Three-Dimensional State

Abstract

The soil cutting force in three-dimensional state was calculated by multiplying the results of two-dimensional state by a three dimensional factor. The factor is estimated from depth/width ratio, cutting angle, angle of soil internal friction, and an influence coefficient, m_s, on the sides of a blade. Comparing other researchers' experimental data with the author's calculated results in clay, loam and so on, the average values of m_s were in the range of 0.4 to 1.0. The accuracy of the predicted cutting force was within 20% when the shearing resistance was in the range of 0.5 to 10kN.