摘要
土体颗粒物流动是一种典型的大变形破坏,具有非牛顿流体的流动特征。准确模拟土体颗粒物的流动及冲击过程,对滑坡和泥石流等地质灾害的防治具有重要意义。物质点法是一种无网格粒子类方法,已在各类大变形问题中得到了广泛应用。以往土体颗粒物流动的模拟,通常采用弹塑性本构模型,但缺乏对非牛顿本构模型的模拟分析。本文引入非牛顿本构模型的模拟分析,旨在为土体颗粒物流动模拟提供一种新的方法与思路。非牛顿本构模型的模拟分析是将非牛顿广义Cross模型引入三维物质点法,通过人工阻尼力模拟颗粒间的摩擦力,对土体颗粒物的坍塌、沿斜面滑动以及冲击障碍物等问题进行了动态模拟,研究了其运动全过程,并与弹塑性本构模型的模拟结果进行了对比验证。结果表明,基于非牛顿流体本构模型的物质点法可以较好地模拟土体颗粒物加速、减速到再次稳定的流动全过程及其对障碍物的冲击效应。
The flow of soil particles is a typical large deformation failure and has the flow characteristics of non-Newtonian fluid.Accurately simulating the flow and impact process of soil particles is of great significance to the prevention and control of geological disasters such as landslide and debris flow.Material point method(MPM)is a kind of meshless particle method which has been widely used in various large deformation problems.In the past,the elastoplastic constitutive model is usually used to simulate the flow of soil particles,but the non-Newtonian constitutive model is lacking.In this paper,the non-Newtonian constitutive model is introduced to provide a new method and idea for soil particle flow simulation.Non-newtonian constitutive model of simulation is introducing generalized Cross non-newtonian model 3 d material point method,through artificial damping force simulation of the friction between the particles to the collapse of the soil particles,along the slope sliding,and hit obstacles such as question has carried on the dynamic simulation,studied its movement process,and with the elastic-plastic constitutive model of the simulation results were compared to verify.The results show that the material point method based on non-Newtonian fluid constitutive model can well simulate the whole process of soil particles accelerating,decelerating and stabilizing and the impact effect on obstacles.
作者
王晶磊
孙政
杨宇杰
周晓敏
WANG Jing-lei;SUN Zheng;YANG Yu-jie;ZHOU Xiao-min(School of Civil and Surveying Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《计算力学学报》
CAS
CSCD
北大核心
2024年第3期452-457,共6页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金(12262013,11902127)
江西省主要学科学术和技术带头人培养计划-青年人才项目(20225BCJ23022)
国家级大学生创新创业训练项目(202010407006)资助.
关键词
物质点法
非牛顿流体
非牛顿流体模型
颗粒物流动
弹塑性模型
material point method(MPM)
non-Newtonian fluid
Cross model
granular flow
Elastoplastic constitutive model
