渗流边坡失稳过程数值模拟  

Numerical simulation on instability process of seepage slope

作　　者：南轩 贺敏杰 刘艳慧[1,2] 李靖 赵崤隆 孙语晨 饶增 NAN Xuan;HE Min-jie;LIU Yan-hui;LI Jing;ZHAO Yao-long;SUN Yu-chen;RAO Zeng(School of Architectural Engineering,Yunnan Agricultural University,Kunming 650201,China;Research Center of Intelligent Facility Agricultural Engineering,Yunnan Agricultural University,Kunming 650201,China;College of Water Conservancy,Yunnan Agricultural University,Kunming 650201,China;China Railway Siyuan Group Southwest Survey and Design Co.,Ltd.,Kunming 650000,China;China Railway Engineering Design Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]云南农业大学建筑工程学院,昆明650201 [2]云南农业大学云南省高校智慧设施农业工程研究中心,昆明650201 [3]云南农业大学水利学院,昆明650201 [4]中铁四院集团西南勘察设计有限公司,昆明650000 [5]中铁工程设计咨询集团有限公司,北京100055

出　　处：《桂林理工大学学报》2022年第2期396-402,共7页Journal of Guilin University of Technology

基　　金：云南省重大科技专项计划项目(202002AE090010);云南省教育厅科学研究基金项目(2019Y0077)。

摘　　要：为了解持续降雨过程中土质渗流边坡的稳定性变化,用CFD-DEM耦合方法建立三维土质边坡模型,设定土壤颗粒之间接触参数以满足土质边坡特征并形成离散元边坡模型,通过CFD中DDPM耦合实现颗粒占用体积分数模型,基于土壤渗流过程中从非饱和状态到饱和状态进行液桥力API的开发来实现颗粒在渗流过程中粘结力及流场变化。应用此模型分析饱和状态下边坡失稳的情况,结果表明:在整个渗流过程中,从上部到下部,由于压实作用,各监测点渗流速度逐渐减小,符合渗流边坡非饱和阶段开发的液桥力实际情况,渗流速度最大处即为边坡失稳的初始点。In order to study the stability of soil seepage slope during continuous rainfall,a three-dimensional soil slope model was established by CFD-DEM coupling method.Contact parameters between soil particles were set to form a slope model,which was adopted in CFD.DDPM is coupled to realize the model of particle volume fraction.Based on the API development of liquid bridge force from the unsaturated state to the saturated state during the soil seepage process,the contact and flow field changes of the particles in the seepage process are realized.The edge is studied under saturation based on this model.The results show that,in the whole seepage process,from top to bottom,due to dynamic pressure,the seepage velocity of each monitoring point decreases gradually.It is consistent with the actual situation of liquid bridge force developed in the unsaturated stage of seepage slope.And the maximum seepage velocity is the initial point of slope instability.

关 键 词：渗流边坡 液桥力 CFD-DEM 动态失稳 

分 类 号：TV3[水利工程—水工结构工程]