基于SPH方法的海底滑坡运动演化过程模拟  

SIMULATION OF THE EVOLUTION PROCESS OF SUBMARINE LANDSLIDES BASED ON SPH APPROACH

作　　者：戴自立 蓝柏森 李小锋 DAI Zili;LAN Baisen;LI Xiaofeng(School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学力学与工程科学学院,上海200444

出　　处：《工程地质学报》2025年第1期213-223,共11页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:42102318).

摘　　要：海底滑坡普遍具有方量大、流速快、影响范围广的特征,是一种极具破坏力的海洋地质灾害,对海洋工程构成极大威胁。在海底滑坡运动过程中,滑坡体与周围水体发生剧烈的相互作用,传统的数值方法较难模拟这一复杂过程。本文基于光滑粒子流体动力学(SPH)方法,运用Herschel-Bulkley黏性流体模型和经典牛顿流体模型分别模拟滑坡体及其周围水体,建立了SPH多相流海底滑坡数值模型,并通过密度的人工扩散项及状态方程的修正提高数值计算的稳定性。通过模拟海底滑坡模型试验,验证了SPH多相流模型的准确性和适用性,探究了流变参数对滑坡运动特性的影响,最后运用本文建立的SPH多相流模型模拟了朱家尖海底滑坡的运动演化过程,分析了滑坡体与水体的相互作用模式,预测了其运动速度和滑移距离。本研究可以为海底滑坡灾害的防治工作提供科学依据。Submarine landslides generally have the characteristics of large volume,fast flow velocity,and wide impact range,and are a highly destructive marine geological hazard that poses a great threat to marine engineering.During the propagation of submarine landslide,there is a violent interaction between the landslide body and surrounding water,and traditional numerical methods are difficult to simulate this complex process.Based on the Smooth Particle Hydrodynamics(SPH)method,this paper applies the Herschel Bulkley viscous fluid model and the classical Newtonian fluid model to simulate the landslide and its surrounding water,respectively.An SPH multiphase flow model is established for the submarine landslide,and the stability of the model is improved through the artificial diffusion term of density and the modification of the state equation.Through the simulation of the submarine landslide model experiments,the accuracy and applicability of the SPH model are verified,and the influence of rheological parameters on landslide propagation characteristics is explored.Finally,the SPH multiphase flow model established in this paper is used to simulate the motion process of the Zhujiajian submarine landslide,analyse the interaction mode between the landslide body and surrounding water,and predict its sliding velocity and runout distance.This study can provide scientific basis for the prevention and mitigation of submarine landslide disasters.

关 键 词：海底滑坡 光滑粒子流体动力学 多相流 运动演化 

分 类 号：P642.22[天文地球—工程地质学]