地震作用下跨地裂缝的地下综合管廊动力响应研究

Study on Dynamic Response of Underground Integrated Pipe Gallery Trans-Ground Fissures Under Earthquake

以西安市幸福林带地下综合管廊项目为例,采用了Abaqus有限元软件对跨地裂缝的地下综合管廊结构进行动力时程分析,找出了跨地裂缝管廊结构在地震作用下的动力响应规律。结果表明:在地震作用下,跨地裂缝的管廊结构底板加速度响应和位移响应显著,应力集中现象更明显,易出现破坏,尤其是在地裂缝附近的管廊结构反应更加剧烈;处于场地上盘的管廊结构会发生沉降,处于场地下盘的管廊结构会出现脱空,管廊结构随着土体的变形而发生相应的变形;随着地震强度增大,管廊结构的竖向位移也随之增大,且低频成分较多的地震波对结构的破坏更严重。

Taking the underground integrated pipe gallery project of Xi'an Happy Forest Belt as an example,the dynamic time history analysis of the trans-ground fissure underground integrated pipe gallery structure is carried out by finite element software Abaqus,and the dynamic response law of the trans-ground fissure underground integrated pipe gallery structure under earthquake action is found out.The results indicate that:under the earthquake action,the acceleration response and displacement response of the bottom plate of the trans-ground fissure pipe gallery structure are significant,the phenomenon of stress concentration is more obvious,it is liable to be damaged,and the response of the pipe gallery structure near ground fissures is especially more intense;pipe gallery structure on site floor will subside,pipe gallery structure on site floor will void,and pipe gallery structure will deform with soil deformation;with the increase of seismic intensity,the vertical displacement of pipe gallery structure increases,and the damage of structure caused by seismic waves with more low frequency components is more serious.