地铁隧道-地层动力相互作用模型试验参数设计

以西安地铁2号线为研究原型,根据模型试验相似准则,设计了列车荷载作用下地裂缝-地铁隧道-地层动力相互作用试验模型。根据试验需求及场地条件,确定采用模型试验箱进行试验,模型试验箱考虑了地铁隧道与地裂缝的不同交角,可以分别模拟地铁隧道与地裂缝呈90°正交、60°斜交、30°斜交的情况,同时,试验采用激振器模拟了不同频率的车辆振动荷载。根据相似原理,合理确定了几何参数、地铁隧道及围岩材料参数、动力加载方式及动力试验参数,以期通过模型试验来研究地铁隧道-地裂缝-地层在列车振动荷载作用下的动力响应规律,为列车振动控制措施研究提供参考。

The Similar Principle and Parameters Design of the Model Test for Dynamic Interaction between Metro Tunnel and Stratum

In order to better reflect the actual situation,the metro line 2in xi′an is taken as the research background and then the model test on the dynamic interaction of ground fissure-metro tunnel-stratum according to the similarity criterion is designed.According to the test requirements and site conditions,it is determined to use model box in the test.The different intersection angles between metro tunnel and ground fissure are taken into account when making model box. It can simulate different intersection angles,such as 90°、60°and 30°.Besides,the model test desides to use vibrator to imitate different frequency of train vibration load.According to the similarity principle,we reasonably determine the geometric parameters,the subway tunnel and surrounding rock material parameters,dynamic load and dynamic test parameters and so on.It′s expected to study the dynamic response law of subway tunnel-ground fissure formation under train vibration load through the model test and then provide reference for the study on the train vibration control measures.