Research on Calculation Model of Excavation Resistance Under Heterogeneous Soil Conditions

doi:10.16182/j.issn1004731x.joss.25-0586

Abstract

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

CLC Number:

TP391.9

Zhang Xin, Zhang Ping, Zhang Chen, Liu Wei, Han Boyang. Research on Calculation Model of Excavation Resistance Under Heterogeneous Soil Conditions[J]. Journal of System Simulation, 2026, 38(5): 1320-1332.

Figures/Tables 16

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Table 1

Mechanics parameters of heterogeneous soil

含石率/%	黏聚力 $c 1$ /kPa	内摩擦角ϕ/(°)	硬度值K_d	密度ρ₁/(kg/m³)	外摩擦角δ/(°)
30	1.2	33.4	0.91	2 040.8	26.2
45	1.1	35.4	0.96	2 150.2	31.4
60	1.0	40.3	1.02	2 324.5	43.1

Table 1

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Table 4

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颗粒类型	EDEM颗粒模型	实际颗粒形状
土壤
块状石块
片状石块

接触类型	恢复系数	静摩擦系数	滚动摩擦系数
土壤与土壤	0.55	0.60	0.03
土壤与铲斗	0.55	0.70	0.03
土壤与石块	0.50	0.50	0.08
石块与石块	0.51	0.49	0.21
石块与铲斗	0.80	0.75	0.12

工况类型	含石率/%	挖掘轨迹
Ⅰ	30	1
Ⅱ	45	1
Ⅲ	60	1
Ⅳ	45	2