parallel-bond radius Rand the two lines have lengths equal to the distance betweenthe center of the two bonded particles. Seen from Fig. 7, the parallel bonds near thesurface of the bulldozing plate decrease significantly and even disappear with timegoing. The reason is that the parallel bonds break (if the parallel bonds break, theywill disappear) with the rupture and separation of the soil particle aggregate clusters.The disturbance of cohesive soil increase and more soil clumps rupture and separation with the bulldozing plate moving.
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