近似Rayleigh地震波作用下地下综合管廊响应分析

地下综合管廊是一种重要的生命线基础设施,目前对其抗震性能的研究还处于起步阶段。由于属于浅埋地下结构,故地震波中的面波、尤其是Rayleigh波可能会成为地下综合管廊破坏的控制因素。本文根据简谐Rayleigh波的特点,提出了近似Rayleigh地震波的概念,并在假定已知Rayleigh波水平分量的情况下,利用傅里叶变换求得近似Rayleigh地震波场。采用三维有限元模型,对地下管廊结构进行了地震响应分析。分析结果表明:本文建议方法可以有效地模拟波动的传播过程;地下综合管廊结构的变形以整体弯曲变形为主;结构顶面应变约为对应底面位置应变的两倍,与Rayleigh波沿深度衰减的规律相类似。

Response Analysis of Utility Tunnel in Earthquake of Approximate Rayleigh Waves

The utility tunnel is one of the important lifelines.However,the research of its seismic perfor- mance is still at the initial stage.Usually,the utility tunnel is shallowlly buried,so the surface waves,es- pecially the Rayleigh ones,would be the control factor to its failure.This paper puts forward the concept of earthquake of approximate Rayleigh waves.And at the same time,the Rayleigh wave field is obtained with the Fourier's technique under the assumption that the time history of horizontal component of earth- quake is known.A 3-D finite element model is set up with the software ABAQUS to study the seismic re- sponse of the utility tunnel.From the calculated results,the wave propagation can be seen clearly and the structural deformation is dominated mainly by the bending deformation;the strain at the top point is about 2 times as large as that at the bottom point,which is similar to the character of the Rayleigh waves.