变含水量泥流本构及泥流-桥墩冲刷的流固耦合分析  

Mud Flow Constitutive Law of Variable Water Content and Fluid Structure Interaction Analysis of Pier Column under Mud Flow Scouring

作　　者：庞彪 董洪晶 范文阳 谭婕婕[1] 陈熹 戴瑛[3] PANG Biao;DONG Hongjing;FAN Wenyang;TAN Jiejie;CHEN Xi;DAI Ying(Road and Bridge Engineering School,Guangxi Vocational and Technical College of Communications,Nanning 530023,Guangxi,China;College of Civil Engineering and Architecture,Jiaxing University,Jiaxing 314001,Zhejiang,China;School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China)

机构地区：[1]广西交通职业技术学院路桥工程学院,广西南宁530023 [2]嘉兴大学建筑工程学院,浙江嘉兴314001 [3]同济大学航空航天与力学学院,上海200092

出　　处：《力学季刊》2024年第1期110-118,共9页Chinese Quarterly of Mechanics

基　　金：安徽省教育厅高等学校科学研究重点项目(2023AH051841)。

摘　　要：泥石流是山区主要的地质灾害之一,对山区桥梁破坏严重.在流动过程中,泥石流受到含水量的影响较大,其本构模型会发生变化.本文对泥石流的一种特殊形式——泥流的质量含水量进行分析,将含水量引入泥浆的Herschel-Bulkley模型中,提出质量含水量及剪切速率同时变化下的泥流材料本构模型,并与成都黏土泥浆流变实验对比,验证该模型的正确性.而后基于两相流体的Navier-Stokes方程,将该本构模型应用于三维泥流-桥墩立柱冲击的流固耦合分析中,通过与相关规范及文献冲击压力经验公式计算结果对比,证实了模型的实用性.Debris flow is one of the main geological disasters in mountainous areas,which causes seriously damages to bridges in mountain areas.During the flow process,the debris flow is significantly affected by the water content,leading to possible variation of its constitutive model.In this paper,the factor of water content is introduced into the Herschel-Bulkley model of mud,and a constitutive model of mud flow material under the simultaneous changes of mass water content and shear rate is proposed.The model is compared with the rheological experiment of Chengdu clay mud to verify its correctness.Then,based on the Navier-Stokes equations of two-phase fluid,the material model is applied to the three-dimensional fluid-structure coupling analysis of the impact of the mud flow on the pier column.The applicability of the model was confirmed by comparing the calculation results with the relevant standards and the empirical formulas of impact pressure in the literature.

关 键 词：泥流 本构模型 两相流 桥墩 流固耦合 

分 类 号：O341[理学—固体力学]