沉管隧道接头地震动力响应分析
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摘要
以港珠澳桥隧工程中的沉管隧道为工程实例,建立沉管隧道部分管段的三维有限元模型,并采用ABAQUS有限元软件对其进行动力计算。计算中考虑了地基土层的初始应力平衡和地基无限域的辐射阻尼效应影响,地震作用通过基岩运动以惯性力方式施加,分析了隧道管段及沉管接头部位的应力和位移。在水平向和竖直向地震共同作用下,管节的竖向相对位移要比水平向大很多;沉管接头附近的管节单元具有较大的应力,主要是由于接头材料发生变化,容易发生应力集中现象。计算结果可供沉管隧道设计参考。
Taking the immersed tube tunnel segment in HongKong-Zhuhai-Macao bridge-tunnel project as an example,the three-dimensional finite element model of partial segment of the tunnel was built.The Software Abaqus was adopted in the dynamic computation.The initial stress equilibrium of soil mass and the effect of radiation damping were taken into account.The applying inertia force by earthquake movement were considered.The stress and displacement of the tube segment and joint part were analyzed.The results show that,under the combined effects of horizontal and vertical earthquake excitation,the vertical displacements of the tube segments are much greater than the horizontal displacements.The tube segment elements near joints have greater stress by reason that the material at the joints is easy to concentrate stress.These results may give a reference to similar projects.
引文
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