Analysis of Vehicle Motion on Soft Soil Based on Cdem-Dem Coupling Method

Abstract

Ensuring the passability of vehicle under different soil cases is an important issue in the study of Complex Terramechanics. Considering the coupling effect of multiple physical fields in complex terrain mechanics, a coupling calculation method of Continuous-Discontinuous-Element-Method (CDEM) and Discrete-Element-Method (DEM) was proposed, and a Vehicle-Soil coupling dynamic model was established. Under medium-speed cases, based on the relationship between different vehicle sinking depths, soft soil strength, shear strain, and rolling resistance, the sensitivity of rolling resistance to different parameters is analyzed. The research results indicate that soil strength mainly affects rolling resistance by affecting the sinking depth of vehicle; The sinking depth has little impact on the continuous deformation of soft soil during vehicle movement, but has a significant impact on the rolling resistance; When the sinking depth is constant, the influence of internal friction angle on soft soil deformation is greater than the influence of cohesion. Therefore, considering the variation of friction angle in soft soil can optimize the rapid evaluation of vehicle traffic performance. This research achievement can provide relevant guidance for quickly evaluating the passability of vehicle on soft soil.

Keywords: Terramechanics, Vehicle, Soft soil, Strength, Passability