寒区流冰撞击输水隧洞的数值模拟分析

位于西北寒区的长距离输水工程在流冰期输水过程中,不同流速和不同碰撞角度的流冰对输水隧洞衬砌会形成不同程度的撞击作用,导致输水隧洞衬砌产生破损,因此为了研究该地区流冰对输水隧洞的撞击作用,采用了理论分析结合数值模拟的方法。研究结果表明:当流冰速度一定时,随着流冰与隧洞衬砌碰撞角度的增大,其对隧洞衬砌的影响呈现出近似的非线性(多项式)关系;当碰撞角度一定时,随着流冰速度的增大,其对隧洞衬砌的影响呈现出近似的线性关系;综合不同组合工况还可以发现流冰速度对隧洞衬砌的影响作用要强于碰撞角度对其的影响作用,且碰撞角度对隧洞衬砌所受的撞击力及隧洞碰撞区位移的影响较为不明显。

Numerical simulation of drift ice impact on the water diversion tunnels in cold regions

Long distance water diversion projects in the cold regions of northwestern China are influenced by drift ice in winter, the diversion tunnel linings are damaged by various impact force produced by the drift ice with different velocity and impact angles. In order to study the impact of drift ice on the tunnels in these areas, we adopted theoretical analysis in combination with numerical simulations. The results show that when the velocity of the drift ice is fixed, its influence on the tunnel linings increases with the impact angle and the relationship between them shows an approximate nonlinear variation. When the impact angle is fixed, its influence on the tunnel linings also increases with the velocity, but the relationship shows a linear variation. It is also found that the influence of the velocity is stronger than that of the impact angle under various combined working conditions, and the influence of the impact angle on the impact force and tunnel displacement is not evident.