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On unsteady flows of pore pressure-activated granular materials

机译:在不稳定的孔隙压力活性颗粒材料中

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摘要

We investigate mathematical properties of the system of nonlinear partial differential equations that describe, under certain simplifying assumptions, evolutionary processes in water-saturated granular materials. The unconsolidated solid matrix behaves as an ideal plastic material before the activation takes place and then it starts to flow as a Newtonian or a generalized Newtonian fluid. The plastic yield stress is non-constant and depends on the difference between the given lithostatic pressure and the pressure of the fluid in a pore space. We study unsteady three-dimensional flows in an impermeable container, subject to stick-slip boundary conditions. Under realistic assumptions on the data, we establish long-time and large-data existence theory.
机译:我们研究了非线性偏微分方程组的数学性质,在某些简化假设下,描述了饱和水颗粒材料的演化过程。未固结的固体基质在活化之前表现为理想的塑性材料,然后开始以牛顿流体或广义牛顿流体的形式流动。塑性屈服应力是非恒定的,取决于给定的岩石静压力和孔隙中流体压力之间的差异。本文研究了在粘滑边界条件下不透水容器内的非定常三维流动。在对数据的现实假设下,我们建立了长期大数据存在理论。

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