断层倾角对隧道影响振动台模型试验

Shaking table test in tunnel through fault with different dip angles

采用大型振动台模型试验来研究穿越断层的隧道在地震波的作用下的动力反应。详细介绍了包括模型相似比、模型箱设计、边界条件处理和地震波加载的试验方案。在试验中获得的主要数据有模型围岩的加速度反应时程和隧道上下表面的应变反应时程。试验重点考察穿越不同倾角断层时隧道动力响应规律及特征。结果表明:45°断层倾角周围围岩的动力反应大于30°和60°断层倾角周围围岩的动力反应。同时,断层上盘动力反应大于下盘的动力反应。穿越30°倾角断层时隧道表面应变大于穿越45°和60°倾角断层时隧道表面应变。

To study seismic responses of the tunnel through fault, a large-scale shaking table test was accomplished.This paper introduced the details of tests, including the model similarity ratio, the model box, the treatment of boundary and the input scheme of seismic wave and so on. During the tests, the acceleration time history of the rock and the strain response of the surface of tunnel were investigated.The tests focused on the rule and character of the dynamic response of the tunnel through faults of dip angles with 30°,45° and 60°, respectively.It was concluded that, the dynamic response of rock in the model box with the fault of dip angle with 45°is better than those with 30° and 60°, respectively.At the same time, the dynamic response of rock in the footwall to the fault was more apparent than hanging wall to the fault. The surface strains of tunnel in the model box with the fault of dip angle with 30° were greater than those with 45° and 60°, respectively.