航道边界形状对移动载荷激励冰层位移响应特性的影响研究

基于欧拉-拉格朗日流体与固体耦合算法,针对移动载荷激励冰层响应问题开展了数值模拟。对均匀水深条件下的冰层位移响应进行了数值计算并与实验结果进行对比分析,发现二者获得的临界速度值、冰层位移响应波形特征以及最大下陷值都吻合较好,说明所采用的数值计算方法是可靠、有效的。针对限制水域不同航道边界形状条件下移动荷载激励冰层位移响应和载荷临界速度进行了数值模拟,得到了航道边界形状对位移响应和临界速度的影响规律,结果表明:不同截面形状直航道条件下,当矩形截面变化到梯形截面时,临界速度变小,且各速度下冰层最大下陷位移也相应变小;矩形截面形状弯曲航道条件下,临界速度仍存在,且该临界速度对应的冰层最大下陷位移幅值比直航道条件下大。

Influence of the boundary shape of channel on the characteristics of ice-sheet displacement response induced by a moving load

Based on an Euler-Lagrange fluid-solid coupling algorithm, a numerical simulation on  ice sheet responses under a moving load was carried out.By comparing the calculation results in uniform water depth condition with the data in field experiments, it is found that the value of critical speed, the wave profile of ice displacement response at its critical speed and the maximum negative deflection at different speeds are consistent with the experiment results, which shows the numerical method is reliable and effective.Similar simulations in the condition of restricted water area with different boundary shapes were also carried out.The influence of channel boundary shape on the displacement response and critical speed was analysed.The results show that for straight channels with different cross section shape, when a rectangular section tranfers to a trapezoidal section, the critical speed becomes lower, and the maximum depression displacement of the ice sheet will decrease at various speed.For curved channels with rectangular section, the critical speed still exists, and the maximum depression displacement amplitude corresponding to the critical speed is larger than that of straight channels.