地裂缝和地震耦合作用下地下综合管廊的三维动力分析

以西安幸福林带地下综合管廊项目为例,运用有限元软件Abaqus建立了管廊结构三维模型,并找出了地下综合管廊结构在地裂缝活动和地震耦合作用下的变形和应力分布规律。结果表明:在地裂缝活动较弱或无活动时,跨地裂缝管廊结构底板的加速度响应更显著,但随着沉降量的增大,结构的峰值加速度最大值出现位置由底板转向顶板;空间较大的舱室更易发生破坏,且中间位置(地裂缝附近处)的应力集中现象更加明显,逐渐向两端衰减;当地裂缝活动较大时,整体结构出现应力重分布,应力集中的位置发生转移。

3-D Dynamic Analysis of Underground Utility Tunnel Under Coupling Effect of Ground Fissure and Earthquake

Taking the underground utility tunnel project of Xi'an Xingfu forest belt as an example,the finite element software Abaqus is used to establish the 3-D model of the utility tunnel structure,and the deformation and stress distribution rule of the underground utility tunnel structure under the coupling effect of ground fissure activity and earthquake is found out.The results show that when the ground fissure activity is weak or inactive,the acceleration response of the floor of utility tunnel structure across ground fissure is more significant,but with the increase of the settlement of underground utility tunnel,the maximum peak acceleration value of the structure changes from the floor to the roof;the cabin with large space is more likely to be damaged,and the stress concentration phenomenon in the middle position(near the ground fissures)is more obvious and gradually decays toward both ends.When the ground fissure activity is large,the stress redistribution occurs in the whole structure,and the position of stress concentration transfers accordingly.