穿越断层隧道振动台模型试验研究

Shaking table model test study of tunnel through fault

以西藏某复杂隧道工程为背景,开展了穿越断层隧道振动台模型试验研究。从试验模型相似比、模型箱设计和边界处理、模型制作、测点布置及地震波加载等方面,详细地介绍了试验方案。试验重点观察在地震作用下穿越断层隧道动力响应规律及特征。试验结果分析表明,穿越断层隧道和均质围岩隧道地震动力响应规律有相似之处,随着地震波的向上传播,岩土体地震响应增大;断层处衬砌破坏严重;断层对地震波在岩土体内的传播有一定影响。

Based on the background of a complex tunnel constructed in Tibet,a large-scale shaking table test is accomplished to study the seismic responses of the tunnel through fault.The paper introduces the test including the decision of model similarity ratio,the design of model box and the treatment of boundary,the making of model,the layout of monitored points and the input scheme of seismic wave and so on.The test focuses on the rule and character of the dynamic response of the tunnel through fault.From the test,it is concluded that there are some similarities in seismic response between the tunnel through fault and the tunnel through homogeneous rock.With seismic wave upward propagating,seismic response of rock and soil is increasing and the tunnel lining in fault is damaged severely.There is a certain influence on seismic wave propagation because of fault.