Application of SPH in rheology model for the submerged landslide

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Pooyan Nikeghbali , Rohan Benjankar , Mehran Kheirkhahan
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引用次数: 0

Abstract

The seafloor environment is prone to rapid changes caused by landslides, which can result in significant human, financial, and environmental consequences. Previous research efforts have primarily focused on studying rigid submerged landslides using physical experiments and mesh-based numerical simulations. However, there is a need to investigate deformable soil masses due to their inherent complexity. In the current study, a smoothed particle hydrodynamics (SPH) method was developed to examine the behavior of submerged landslides. Three rheological models, namely Bingham, Herschel–Bulkley (H–B), and μ(I), were applied to characterize the properties of the sediment materials. The SPH governing equations were modified at the interface between the water and sediment phases to account for the density discontinuity between them. The viscosity term at this interface was determined using the Owens equation. The effective pressure, a crucial parameter in rheological models, was appropriately modified to reflect the influence of the water column on the sediment particles, utilizing a simple algorithm. For the μ(I) rheology, separate equations were applied to describe the behavior of dry and saturated conditions. Additionally, the Mohr–Coulomb criteria were utilized in the Bingham and H–B models to determine the yield stress. To validate the effectiveness of the proposed modeling approach, a column failure scenario was first simulated. Subsequently, a rigid submerged landslide was investigated to assess the capability and validity of the proposed framework in accurately capturing surge wave generation and calibrating the boundary friction factor. Finally, two deformable submerged landslides involving different materials, namely sand and glass beads, were simulated and compared with previous experimental and numerical studies at different time steps. Through these comprehensive investigations, the current understanding of the complex behavior exhibited by submerged landslides is enhanced, and valuable insight into landslide dynamics is provided.

SPH 在淹没式滑坡流变模型中的应用
海底环境很容易因山体滑坡而发生快速变化,从而对人类、经济和环境造成重大影响。以往的研究工作主要集中在利用物理实验和基于网格的数值模拟研究刚性水下滑坡。然而,由于可变形土体本身的复杂性,有必要对其进行研究。本研究开发了一种平滑粒子流体力学(SPH)方法来研究淹没式滑坡的行为。三种流变模型,即 Bingham、Herschel-Bulkley(H-B)和(),被用来描述沉积材料的特性。在水相和沉积物相的界面处对 SPH 控制方程进行了修改,以考虑它们之间的密度不连续性。该界面处的粘度项由欧文斯方程确定。有效压力是流变模型中的一个重要参数,利用简单算法对其进行了适当修改,以反映水柱对沉积物颗粒的影响。对于()流变,采用了不同的方程来描述干燥和饱和条件下的行为。此外,宾厄姆模型和 H-B 模型还采用了莫尔-库仑准则来确定屈服应力。为了验证所提议的建模方法的有效性,首先模拟了柱体破坏的情况。随后,研究了刚性浸没式滑坡,以评估拟议框架在准确捕捉涌浪产生和校准边界摩擦因数方面的能力和有效性。最后,模拟了两种涉及不同材料(即沙子和玻璃珠)的可变形浸没式滑坡,并在不同时间步长下与之前的实验和数值研究进行了比较。通过这些全面的研究,加深了目前对淹没式滑坡所表现出的复杂行为的理解,并为滑坡动力学提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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