论文部分内容阅读
采用动力有限元数值方法,分析在建北京地下联络线列车运营对既有地铁结构的振动影响,根据相关的振动控制限值对全线既有地铁结构的安全性进行预测评估。以车轨耦合方法模拟列车移动荷载,采用弹簧—阻尼吸收边界模型以减弱动力边界反射波的影响。结果表明:地下联络线列车运营对既有地铁结构4个区段有一定程度或明显地振动影响,需在这些区段采取减振量为8~12 dB较高的减振措施,减振长度为在既有地铁结构对应的地下联络线长度基础上,两端各增加一段缓冲长度,列车进入端缓冲长度取200 m,列车离开端缓冲长度取100 m。
The dynamic finite element numerical method is used to analyze the influence of train operation on the existing metro structure under the Beijing underground link. The safety of all existing metro structures is predicted and evaluated according to the relevant vibration control limits. The train-rail coupling method is used to simulate the moving load of the train, and the spring-damping absorption boundary model is adopted to reduce the influence of the dynamic boundary reflected wave. The results show that the operation of underground link train has a certain degree or obvious vibration effect on the existing 4 sections of the metro structure, and the vibration reduction measures of 8 ~ 12 dB are needed in these sections. The vibration reduction length Based on the length of the underground link corresponding to the existing metro structure, a buffer length is added at each end of the subway structure. The buffer length of the entry end of the train is 200 m and the buffer length of the departure end of the train is 100 m.