流沙崩塌的细观力学模型
A micromechanical model of collapsing quicksand
摘要：
离散单元法是模拟颗粒/土壤材料微观行为（即在颗粒尺度上）的一类通用建模技术。我们提出了一种接触动力学方法，占细粉和土壤的粘性。修改后的模型调整，以捕捉基本的物理过程的动力学的生成和松散系统的崩溃是能够模拟“流沙”的行为的塌陷土壤材料，特别是一个特定的类型，我们称之为“活流沙”。我们研究了物体在不同密度下的穿透行为。我们还调查的渗透过程的动力学，通过测量的驱动力和由此产生的入侵者的速度之间的关系，导致一个“幂律”的行为与指数1/2，即二次速度依赖的阻力入侵者。
英文摘要：
The discrete element method constitutes a general class of modeling techniques to simulate the microscopic behavior (i.e. at the particle scale) of granular/soil materials. We present a contact dynamics method, accounting for the cohesive nature of fine powders and soils. A modification of the model adjusted to capture the essential physical processes underlying the dynamics of generation and collapse of loose systems is able to simulate "quicksand" behavior of a collapsing soil material, in particular of a specific type, which we call "living quicksand". We investigate the penetration behavior of an object for varying density of the material. We also investigate the dynamics of the penetration process, by measuring the relation between the driving force and the resulting velocity of the intruder, leading to a "power law" behavior with exponent 1/2, i.e. a quadratic velocity dependence of the drag force on the intruder.
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