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在地铁隧道—地裂缝动力相互作用模型试验中,拟采用点荷载的加载方式。为了合理制定模型试验加载方案,建立了点荷载和移动荷载2种加载方式下,与地裂缝正交的马蹄形隧道—地裂缝—地层动力相互作用的数值模型。通过对2种加载方式下的拱底土层竖向最大位移、土层最大加速度分布、土层加速度时程以及衬砌加速度时程进行对比分析,可以得出在2种加载方式下,拱底竖向最大位移、土层加速度分布、土层加速度时程以及衬砌加速度时程在分布上有相近的规律,从而说明了在模型试验中,可以用点荷载加载方式来代替移动荷载,为模型试验提供了依据。
In the metro tunnel-to-ground fissure dynamic interaction model test, the loading method of point load is proposed. In order to rationally set up the model test loading scheme, the numerical model of the horseshoe tunnel-ground fissure-formation dynamic interaction orthogonal to the ground fissures under the two loading methods of point load and moving load was established. By comparing the maximum vertical displacement, the maximum acceleration distribution of soil layer, the acceleration time course of soil layer and the acceleration time history of lining under two kinds of loading methods, it can be concluded that under the two kinds of loading modes, The maximum displacement, soil acceleration distribution, soil acceleration time history and lining acceleration time history are similar in distribution, which shows that in the model test, point load loading method can be used instead of moving load, which provides model test in accordance with.