基于粮食散体材料与仓壁相互作用的偏心卸料钢筒仓稳定性研究

偏心卸料筒仓与粮食散体材料间产生复杂的相互作用，甚至导致筒仓整体失稳，研究该问题具有重要的理论和应用价值。本项目从研究粮食散体材料力学特性入手，建立筒仓与粮食散体材料相互作用数值模型，揭示钢筒仓与粮食散体材料间的相互作用规律和偏心卸料仓壁荷载分布规律，提出考虑偏心率、高径比等影响的筒仓稳定性简化计算法。具体内容包括：1)根据粮食应力路径三轴试验，修正双屈服面本构理论，并与任意拉格朗日-欧拉法相结合，建立偏心卸料钢筒仓与粮食散体材料相互作用数值模型；2)通过数值模型研究偏心率、高径比等影响下的钢筒仓与粮食散体材料间相互作用规律，提出仓壁径向压力和竖向摩擦力分布规律；3)根据筒仓荷载分布规律，研究偏心率、径厚比和高径比等对筒仓稳定承载力的影响，提出考虑偏心率、高径比等影响的临界轴向应力、径厚比等稳定性简化计算法。旨在通过理论和技术创新，提高仓储设施研究和应用水平，保障国家粮食储藏的安全。

There is a very complex interaction between silo and grain under eccentric discharge conditions, and even lead to instability of silo, so it’s very important to study the problem. In this project, the mechanical properties of grain is first studied, then grain-wall interaction numerical model is build, reveal the rules of grain-wall interaction and distribution of wall load, propose a simplified model to study stability of silo considering eccentricity ratio and aspect ratio. The concrete contents include: 1) based on strain path triaxial tests of grain, revise the double yield surface model, and combined with ALE method, establish the silo-grain interaction model; 2) reveal the rules of grain-wall interaction under influence of eccentricity ratio and aspect ratio through the numerical model, propose wall load distribution model; 3) based on load distribution model, study the influence of eccentricity ratio, radius-thickness ratio and aspect ratio on buckling strength, propose a simplified model to study silo stability considering eccentricity ratio and aspect ratio. Through theoretical and technological innovation, to improve the level of research and application of storage facilities, and ensure national grain storage safety.