都市快轨交通·第31卷第3期2018年6月 doi: 10.3969/j.issn.1672-6073.2018.03.013
考虑接头影响的
《土建技术
盾构隧道地震响应分析
陈怀伟
（浙江省机电设计研究院有限公司，杭州310051）
摘要：为探明地震作用下盾构隧道管片接头与拼装方式对其横断面地震内力及变形的影响，分别针对勾质圆环模型以及梁一弹簧模型开展反应位移法计算，对不同转角错缝拼装管片环的地震内力与变形进行对比分析。研究结果表明：两种模型计算所得衬砌横断面地震弯矩、轴力均呈反对称分布，在左右拱肩、拱脚部位出现最大值地震剪力呈近似对称分布，整环内力图在管片接头处出现内凹或突变；与匀质圆环模型相比，梁一弹簧模型因考虑了管片接头与拼装角度造成地震内力计算结果相差20%左右，变形值则最大可造成40%以上的误差。综上可知，盾构隧道接头对其地震内力分布以及接头处变形均影响显著，采用匀质圆环模型计算管片转角时存在较大误差，当需要精确求解时该模型不再适用。
关键词：反应位移法：盾构隧道接头：匀质圆环模型：梁-弹簧模型：错缝拼装
中图分类号：U231
文献标志码：A
文章编号：1672-6073(2018)03-0078-08
SeismicResponseAnalysisofShieldTunnelConsideringJointEffect
CHENHuaiwei
(Zhejiang Institute of Mechanical &Electrical Engineering Co.,Ltd.,Hangzhou 310051)
Abstract: This study employs a homogeneous ring model and a beamspring model to ascertain the effects of shield tunnel segment joints and assembling methods to seismic response properties, and calculates the lining mechanical behaviors using the seismic deformation method. The internal force and deformation of segments and joints are also analyzed. The results showed that the distribution of the segments' bending moment and the axial force was anti-symmetrical around the tunnel ring with the maximum value appearing at both sides of the ring spandrel and spinning, while the shear distribution was approximately symmetrical. The differences of the lining intermal forces caused by the joint effect and the staggered assembling type were approximately 20% between the homogeneous ring model and the beamspring model. However, the difference in the segmental joints' rotation angle caused by the same reasons would be more than 40%. Therefore, the joint effect of the shield tunnel can remarkably change the intermal forces of the lining and the deformation of joints. The homogeneous ring model leads to a negligible difference in the rotation angle of the segmental joints and is unsuitable for application when better accuracy is required
Keywords: seismic deformation method; joints of shield tunnel; homogeneous ring model; beam-spring model; staggered assembling
研究背景
随着我国新一轮基础设施建设高潮期到来，盾构收稿日期：2017-07-18
修回日期：2017-10-27
作者简介：陈怀伟，男，工程硕士，高级工程师，从事地下工程
设计工作，chenhuwe@163.com
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URBAN RAPID RAILTRANSIT
隧道凭借其施工安全快速、占地面积少、对环境影响小等优势得到了广泛应用，覆盖了交通、市政、电力、水利等多个领域()。与此相对应的是我国面临的严峻地震形势，地处太平洋板块和欧亚板块交汇部位使我国地震活动异常活跃，且当前正处于我国几大地震带的活跃期，工程抗震问题越发严峻[2]。从住房和城乡