关键词: 挖掘阻力, 非均质土壤, 计算模型, 耦合模型, 联合仿真

Abstract:

To address the problem of insufficient prediction accuracy of excavation resistance in heterogeneous cohesive soil, a spatial calculation model of excavation resistance at each excavation stage under heterogeneous soil conditions was proposed based on the cutting wedge model, comprehensively considering multi-dimensional factors such as bucket geometry, side plate effect, lateral force, and inertia. By taking a small crawler hydraulic excavator as the research object, a coupled simulation model of boom multi-body dynamics and soil-rock particle discrete element was established, and the theoretical model was validated through the co-simulation of excavation operations. The simulation results indicate that under the working conditions of different stone contents and excavation depths, the theoretical values and the simulated values of the proposed calculation model are in good consistency, and the component force errors are reasonable. The model can effectively characterize the spatial dynamic distribution of excavation resistance, demonstrating high accuracy and applicability.

Key words: excavation resistance, heterogeneous soil, calculation model, coupled model, co-simulation