3-D DEM simulation of cohesive soil-pushing behavior by bulldozer blade

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3-D DEM simulation of cohesive soil-pushing behavior by bulldozer blade

Tsuji, T. / Nakagawa, Y. / Matsumoto, N. / Kadono, Y. / Takayama, T. / Tanaka, T.

Highlights ► DEM analysis was conducted for the excavation and pushing processes of cohesive soil. ► Soil behavior depending on the magnitude of microscopic cohesive force was verified. ► Characteristic behaviors such as the rolling motion of soil aggregates were observed.

Abstract A numerical simulation based on discrete element method (DEM) was conducted on the excavation and pushing processes of soil by a bulldozer blade. Soil contains water and the resistance acting on the bulldozer blade is largely influenced by the cohesive force due to liquid bridges formed among soil particles. In the present study, a cohesive bond force model proposed by Utili and Nova was introduced in which the microscopic behavior of cohesive force was modeled analogously with macroscopic shear failure characteristics. The dependency on the magnitude of microscopic cohesive force was verified. The behavior of particles changed greatly by taking into account the cohesive bond force. The characteristic behavior of excavated soil aggregates, such as rolling motion and intermittent collapsing, were observed in front of the blade surface.