基于SPH-DEM的水下散粒体滑坡涌浪机理研究  

Research on Mechanism of Underwater Landslide Surges Based on SPH-DEM Modeling

作　　者：高景芝 陈丁[1] 姚学昊 GAO Jingzhi;CHEN Ding;YAO Xuehao(College of Mechanics and Engineering Science,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学力学与工程科学学院,南京211100

出　　处：《河南科学》2025年第3期356-365,共10页Henan Science

基　　金：国家自然科学基金项目(12302257)。

摘　　要：精准预测滑坡体的运动和自由表面波浪的生成是水下滑坡研究的关键。本文结合光滑粒子流体动力学(SPH)与离散单元法(DEM)各自的优势,并考虑水体在散粒体滑坡中的渗透作用,建立了适用于分析水下散粒体滑坡涌浪问题的SPH-DEM耦合模型。通过U型管多孔介质渗透算例,进一步验证了模型所计算的渗透力的准确性,证明了SPH-DEM耦合模型在模拟土-水耦合问题上的可行性和有效性。对水下可变形滑坡问题进行模拟计算,阐述了水下散粒体滑坡的渗透机制,并系统研究了渗透系数对散粒体滑坡变形和波浪形态的影响,发现随着渗透系数的增加,散粒体滑坡变形程度与最大首浪浪高均呈对数变化。进一步考虑不同土体质量与渗透系数对散粒体滑坡形态以及涌浪高度的影响,得到散粒体滑坡变形的拟合公式。Accurate prediction of landslide motion and free-surface wave generation is the focus of landslide surge research.In this paper,a coupled model suitable for analyzing the wave generation of underwater granular landslides is established by combining the advantages of the smooth particle hydrodynamics(SPH)and the discrete element method(DEM),and taking into account the penetration of water in granular landslides.The SPH and DEM methods are used to solve the water body and granular body respectively,and Darcy’s permeability law is utilized to calculate the water body-granular body coupling force,and the solved system can satisfy the requirement of momentum conservation.Through the U-tube porous media seepage example,we further verified the accuracy of the seepage force calculated by the model,demonstrating the feasibility and effectiveness of the SPH-DEM coupling model in simulating soil-water coupling problems.A simulation of the underwater deformable landslide problem was carried out to illustrate the infiltration mechanism of underwater granular landslides,and the influence of the infiltration coefficient on the deformation of granular landslides and wave morphology was systematically investigated,and it was found that the degree of deformation of granular landslides and the height of the largest first wave varied logarithmically with the increase of the infiltration coefficient.The effects of different soil masses and permeability coefficients on granular landslide morphology as well as surge height are further considered to obtain the fitting equations for granular landslide deformation.

关 键 词：水下滑坡涌浪 土-水耦合 光滑粒子流体动力学 离散元 渗透系数 

分 类 号：O35[理学—流体力学]