流冰对输水隧洞衬砌的撞击影响研究

基于LS-DYNA软件对流冰与输水隧洞的撞击作用进行非线性有限元仿真模拟,并且通过几何比尺C l为5的室内物理模型试验进行相应的验证,发现水介质中不同工况下流冰对输水隧洞衬砌的撞击影响规律。最终结果表明:流冰的压缩强度对隧洞衬砌的撞击影响呈现出近似的对数函数关系;流冰厚度对隧洞衬砌的撞击影响呈现出近似的多项式关系;综合分析该研究所模拟的不同工况可以发现,水介质的作用以及“水垫效应”的影响在小型流冰撞击输水隧洞衬砌过程中表现的较为明显,在求解分析时应充分考虑,不可忽略。同时,通过仿真模拟和试验验证得出的计算结果基本吻合,表明所采用的数值仿真模型准确可靠。

A study on the impact effect of drift ice on the lining of a water tunnel

In order to find the impact law of ice in water medium in different working conditions on the lining of a water tunnel,nonlinear finite element simulation of the impact of current ice and the water tunnel was carried out using the LS-DYNA software,and the corresponding indoor physical model test was verified with the geometric scale of C l as 5.The results show that the impact effect of ice compression strength and thickness on tunnel lining respectively show approximate logarithmic function relationship and polynomial relationship;comprehensive analysis of the different simulated working conditions in this paper,it can be found that the effect of water medium and"effect of water cushion"are more obvious in the process of small flow ice impinging on the lining of the water supply tunnel,so these effects should be fully considered in the solution analysis.At the same time,the results obtained by simulation and experiment are basically consistent,indicating that the numerical simulation model adopted in this paper is accurate and reliable.