隧道振动台模型试验的相似关系

Similarity Relation in Tunnel Shaking Table Model Test

以嘎隆拉隧道振动台模型试验为例,在模型试验相似理论的基础上对隧道振动台试验相似关系进行了研究;用方程分析法和量纲分析法推导了模型试验相似准则,实现了模型试验几何条件、边界条件、荷载及材料的相似,将其应用于隧道振动台动力模型试验;建立了有限元模型,从加速度时程曲线、频谱特性、加速度放大系数、破坏现象等方面与试验进行了对比。结果表明,试验结果与计算结果比较相符,破坏现象和破坏部位基本相似,说明本次相似关系的拟定是合理的。

Taking Galongla tunnel shaking table model test as an example,similarity relation was studied on the basis of similarity theory.The model test similarity criterion was deduced through equation analysis and dimensional analysis.The similarity of geometric conditions,boundary conditions,loads and materials was simulated in the table test.Finite element model was established and comparison was made from the perspective of the curve of acceleration time,spectrum feature,coefficient of acceleration and failure.The results of the tests coincided highly with calculation results;the failure phenomena and location also agreed well,which indicated that the simulation relation was reasonable for the model.