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通过引入考虑范德华力和抗转动作用的月壤微观接触模型,采用离散单元法模拟月壤水平推剪试验(简化的土-开挖设备间相互作用模型),对月壤推剪破坏机制进行研究,分析了推剪深度、倾角和速率的影响,为真实月面环境下开挖提供参考。结果表明:推剪过程中推剪阻力首先随推剪位移增加至峰值,而后下降并趋于稳定;随推剪位移的进一步发展,推墙前方土体堆积,推剪阻力缓慢回升,推墙前土体受扰动区范围逐渐增大;当推剪面竖直时,随着推剪深度增加,推剪阻力和能量消耗增大,前方受扰动土体范围增大,破坏面为直平面;相同推剪深度下,推剪倾角越大,推剪阻力和能量消耗越小,前方扰动土体范围越小,破坏面为直平面;推剪速率越大,推剪阻力和能量消耗增大,前方扰动土体范围越大。由于月面开挖时推剪反力由机械与月面摩擦提供,考虑到开挖机械重量受空间运输能力限制,建议采用对推力(机械重量)要求低的浅层、倾斜、慢速开挖,适用于月面早期建设活动。
By introducing the monthly microscopic contact model considering the van der Waals forces and the anti-rotation effect, the lunar soil horizontal shear test (simplified soil-rock interaction model) was carried out by using the discrete element method and the shear damage mechanism of lunar soil was studied The effects of clipping depth, dip angle and velocity were analyzed to provide reference for excavation under the real lunar environment. The results show that the resistance of the shear resistance increases with the increase of the shear stress, and then decreases and tends to be stable. With the further development of the shear displacement, the soil in front of the wall piles up and the resistance of the shear resistance rises slowly. When the pruned surface is vertical, as the depth of pruned shear increases, the resistance and energy consumption of pruning shear increase, and the scope of soil disturbed in front increases and the destructive surface is straight; the same At the depth of shearing, the larger the shearing angle, the smaller shearing resistance and energy consumption, the smaller the scope of disturbed soil in front, and the destructive plane is straight. The larger the shearing rate is, the higher the shearing resistance and energy consumption are. The front Perturbation soil the greater the scope. As the thrust of the lunar surface is pushed by the friction between the machinery and the lunar surface, considering that the weight of the excavation machinery is limited by the space transport capacity, it is suggested to adopt shallow, inclined and slow excavation with low thrust (mechanical weight) , Suitable for early lunar surface construction activities.