Rayleigh波入射下建筑群-隧道群相互作用特性研究

Study on the Interaction Characteristics of Building Group and Tunnel Group under Rayleigh Wave Excitation

采用一种高精度间接边界元方法(IBEM),研究了Rayleigh波入射下地上建筑群-地铁隧道群的动力响应。研究发现:地上建筑群与邻近地铁隧道群之间存在显著的相互作用,系统响应规律与入射波的频率、建筑物的数量与高度、隧道数量和位置等因素密切相关。参数分析表明:考虑不同因素影响后,地面运动幅值最大可放大约25%。当入射波频率较低时,地上建筑群结构顶部位移幅值会较单一建筑顶部位移幅值显著降低,这尤其体现在位于建筑群中部的建筑响应中,最大可降低约88%;当入射波频率较大时,这一现象变得不再明显。高频入射波作用下,地上建筑群与地铁隧道群的相互作用会使隧道衬砌产生较大环向应力,其峰值可较单一地上建筑的情况放大约60%。

A high-precision indirect boundary element method(IBEM)is used to study the dynamic response of the aboveground building group and subway tunnel group under Rayleigh wave excitation.It is found that there is a significant interaction between the aboveground building group and the adjacent subway tunnel group,and the system responses are closely related to the frequency of the incident wave,the number and height of buildings,the number and location of tunnels,etc.Parametric analysis shows that the maximum displacement amplitude of the ground building can be amplified by about 25% after considering the influence of different factors.When the frequency of the incident wave is low,the displacement amplitude at the top of the above-ground building group will be significantly lower than that of the single building.The phenomenon is more significant when the building is located in the middle position of the building group,and the maximum reduction of the displacement amplitude is about 88%.However,when the frequency of the incident wave is higher,this phenomenon becomes less obvious.High-frequency incident waves will cause large circumferential stresses in the tunnel lining,and the peak circumferential stresses can be 60% larger than that of the single aboveground building.