Multi‐phase‐field microporomechanics model for simulating ice‐lens growth in frozen soil
Multi‐phase‐field microporomechanics model for simulating ice‐lens growth in frozen soil
复制标题
冻土中冰晶生长的多相场微孔力学模型
DOI：
10.1002/nag.3408
复制
发表时间：
2021-11
影响因子：
4
通讯作者：
H. S. Suh;WaiChing Sun
中科院分区：
文献类型：
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作者：
H. S. Suh;WaiChing Sun
本文提出了一个多相场孔隙力学模型，该模型模拟了多组分冻土中冰透镜体的生长和融化以及由此产生的冻胀和融沉。冻致裂缝内分离冰的增长隐含地由两相场的演化表示，两相场分别指示分离冰和受损区的位置。两相场的演化是由它们各自的驱动力引起的，这些驱动力分别捕获冰和裂纹生长的物理机制，而相场控制方程与平衡定律相耦合，使得传热，固体变形，流体扩散，裂纹生长和相变之间的耦合可以在数值上复制。与间接捕获冻结对剪切强度影响的唯象方法不同，多相场模型引入了浸没方法，其中均质冻结和冰透镜生长都由冻结特征函数和相应的驱动力明确捕获。验证和验证的例子来证明所提出的模型的能力。
This article presents a multi‐phase‐field poromechanics model that simulates the growth and thaw of ice lenses and the resultant frozen heave and thaw settlement in multi‐constituent frozen soils. The growth of segregated ice inside the freezing‐induced fracture is implicitly represented by the evolution of two‐phase fields that indicate the locations of segregated ice and the damaged zone, respectively. The evolution of two‐phase fields is induced by their own driving forces that capture the physical mechanisms of ice and crack growths, respectively, while the phase‐field governing equations are coupled with the balance laws such that the coupling among heat transfer, solid deformation, fluid diffusion, crack growth, and phase transition can be replicated numerically. Unlike phenomenological approaches that indirectly capture the freezing influence on the shear strength, the multiphase‐field model introduces an immersed approach where both the homogeneous freezing and the ice‐lens growth are distinctively captured by the freezing characteristic function and the driving force accordingly. Verification and validation examples are provided to demonstrate the capacities of the proposed models.