基于水介质下流冰撞击输水隧洞数值模拟  

Numerical Simulation of Flowing Ice Impinging on Water Conveyance Tunnel

作　　者：李义强 贡力[1] 贾治元 杜强业 张娇艳 LI Yiqiang;GONG Li;JIA Zhiyuan;DU Qiangye;ZHANG Jiaoyan(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《船舶工程》2022年第10期171-177,共7页Ship Engineering

基　　金：国家自然科学基金项目(51969011);甘肃省科技计划项目(20JR10RA274;20JR2RA002;21JR7RA301)。

摘　　要：为模拟流冰对输水隧洞的撞击过程,文章以引大入秦工程1#挪威隧洞作为研究对象,基于有限元接触-碰撞的对称罚函数算法与低流速非线性运动方程对流冰碰撞隧过程进行了理论分析,应用ANSYS/LS-DYNA软件建立流冰碰撞隧洞有限元模型,分析水介质下流冰撞击隧洞的动态响应过程。结果表明:碰撞过程水位变化对拱顶影响作用较为明显;冰-拱切线夹角小于55°时,拱局部空间伴随曲面消能与冰荷载作用呈现等效应力“峰-谷”循环波动特征。综合不同工况发现,圆拱直墙式隧洞所受冲击荷载的最不利位置在边墙与拱顶的连接处,且拱顶比边墙更容易产生疲劳破坏;速度对边墙与拱顶最大等效应力影响均呈线性相关。In order to simulate the impact process of drift ice on the water conveyance tunnel, taking the 1#Norway tunnel of Yindaruqin Project as the research object, based on the finite element contact-collision symmetric penalty function algorithm and the low-velocity nonlinear motion equation, a theoretical analysis is carried out, and ANSYS/LS-DYNA software is used to establish the finite element model of the ice collision tunnel, and the dynamic response process of the ice collision tunnel under the water medium is analyzed. The results show that the impact of the water level change on the vault during the collision is more obvious;when the ice-arch tangent angle is less than 55°, the local space of the arch shows the equivalent stress "peak-valley" cyclic fluctuation characteristics along with the energy dissipation of the curved surface and the action of the ice load. According to different working conditions, the most unfavorable position of the impact load on the circular arched straight wall tunnel is at the junction of the side wall and the vault, and the vault is more prone to fatigue damage than the side wall;the speed has the largest impact on the side wall and the vault. The effects of power are linearly related.

关 键 词：输水隧洞 拱顶 水介质 数值模拟 撞击力 

分 类 号：TV672[水利工程—水利水电工程]