针对矿用自卸车行驶过程中的厢斗内物料稳定性问题，研究厢斗内物料动态安息角对厢斗结构设计的影响。首先，基于离散元方法，分析煤颗粒在自然状态下的安息角；进一步，建立厢斗简化模型，研究不同安装角度下矿车正常行驶及爬坡过程中物料的动态安息角，并分析物料滑动规律；结果表明：在水平路面行驶工况下物料动态安息角随厢斗安装角度增加而减小，而爬坡过程中由于厢斗内物料的滑动导致动态安息角随安装角度的增加先缓慢减小再变大再快速减小；当安装角度为10° 时可有效避免厢斗内物料的滑动；最后，以确保厢斗稳定性装载及不撒料为目标，提出厢斗侧板后端的角度设计公式，为厢斗结构设计提供理论依据。

Focusing on the problem of material stability in the carriage of mining dump truck during driving, the influence of dynamic rest angle of materials in carriage on the structure design of carriage was studied. Firstly, based on discrete element method (DEM) simulation technology, the rest angle of coal particles in natural state was analyzed. Further, a simplified model of the carriage was established to study the dynamic repose angle of the material during the normal driving and climbing process of the mine car under different installation angles, and the sliding law of the material was analyzed. The results show that the dynamic repose angle of the material decreases with the increase of the installation angle of the carriage under the driving condition of the horizontal road surface, due to the sliding of the material in the carriage during the climbing process, the dynamic repose angle decreases slowly first, then increases and then decreases rapidly with the increase of the installation angle, the sliding of the material in the carriage can be effectively avoided when the installation angle is 10°. Finally, in order to ensure the stable loading and non-scattering of the carriage, the angle design formula of the rear end of the carriage side plate was proposed which provides a theoretical basis for the design of the carriage structure.