爆炸地震波作用下盾构隧道动力响应分析

发布时间：2019-05-26 18:15

【摘要】：盾构隧道衬砌由于各种类型接头的存在而与整体式衬砌的力学特性存在较大差异。将盾构隧道衬砌结构看作由弹塑性铰链连接的刚性管片组成,考虑围岩介质的黏弹性,提出了爆炸地震波作用下盾构隧道动力分析的简化计算方法。采用该方法对南京地铁盾构段典型横断面进行了动力分析,研究了爆炸地震波入射角度、围岩介质特性及管片厚度对结构受力与变形的影响规律。分析结果表明:波入射角度对盾构隧道有很大影响,斜入射时结构的动力响应要大于垂直入射时结构的动力响应;围岩介质等级越高,围岩对隧道结构的约束越强,隧道的抗爆性能越好;管片厚度的增大会增大结构的内力,合理设置管片厚度有利于提高盾构隧道抗爆性能。
[Abstract]:Due to the existence of various types of joints, the mechanical properties of shield tunnel lining are quite different from those of integral lining. The lining structure of shield tunnel is regarded as composed of rigid segments connected by elastic-plastic hinges. Considering the viscous elasticity of surrounding rock medium, a simplified calculation method for dynamic analysis of shield tunnel under explosive seismic wave is put forward. The dynamic analysis of the typical cross section of Nanjing subway shield section is carried out by using this method, and the effects of the incident angle of explosion seismic wave, the characteristics of surrounding rock medium and the thickness of segment on the force and deformation of the structure are studied. The analysis results show that the wave incident angle has a great influence on the shield tunnel, and the dynamic response of the structure in oblique incident is larger than that in vertical incident. The higher the grade of surrounding rock medium, the stronger the constraint of surrounding rock to the tunnel structure, the better the anti-explosion performance of the tunnel. The increase of segment thickness will increase the internal force of the structure, and the reasonable setting of segment thickness is beneficial to improve the explosion resistance of shield tunnel.
【作者单位】：解放军理工大学爆炸冲击防灾减灾国家重点实验室;南京理工大学机械工程学院;
【基金】：国家重点基础研究发展计划(973计划)项目(No.2010CB732003,No.2013CB036005) 国家自然科学创新研究群体科学基金(No.51021001) 国家自然科学基金(No.51308542,No.51008305)
【分类号】：U451

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