盾构隧道衬砌管片接头张合状态力学模型及数值模拟
发布时间：2018-12-13 04:43
【摘要】：盾构隧道衬砌管片接头处的力学性能极为复杂,采用局部刚度折减法并结合接头张合状态的力学模型进行盾构管片力学性能的数值模拟分析,研究衬砌管片及接头纵向连接螺栓的受力及变形特性。研究结果表明:管片局部刚度折减后整体管片的竖向位移及大变形范围均增大,管片水平位移变化量小,刚度折减区的水平位移略微减少,但影响整体管片内力分布均匀性;基于管片接头力学模型及变形协调原理,管片接头纵向连接螺栓的变形及其变化规律与整体管片的基本相同,但变形量相对较小,且螺栓水平方向变形减少量高于竖直方向的;管片接头纵向连接螺栓轴力基本为压力,承受压力的螺栓占全部螺栓的94.4%以上,弯矩及剪力值较小,其中弯矩沿隧道上下对称分布,剪力沿隧道左右两侧对称分布。本研究可为深入分析管片及接头的力学性能提供参考与借鉴。
[Abstract]:The mechanical properties of the joint of shield tunnel lining segment are very complicated. The local stiffness reduction method and the mechanical model of joint tension state are used to simulate the mechanical properties of shield tunnel segment. The mechanical and deformation characteristics of lining segment and joint longitudinal connection bolt are studied. The results show that the vertical displacement and large deformation range of the whole segment increase after the reduction of the local stiffness of the segment, the horizontal displacement of the segment is small, the horizontal displacement of the stiffness reduction area is slightly reduced, but the uniformity of the internal force distribution of the whole segment is affected. Based on the mechanical model of segment joint and the principle of deformation coordination, the deformation and variation law of longitudinal joint bolt is basically the same as that of integral segment, but the deformation is relatively small, and the reduction of horizontal deformation of bolt is higher than that of vertical one. The axial force of longitudinal connection bolt of segment joint is basically pressure, the bolt bearing pressure accounts for more than 94.4% of all bolts, and the bending moment and shear force are smaller, in which the bending moment is symmetrically distributed along the tunnel top and bottom, and the shear force is symmetrically distributed along the left and right sides of the tunnel. This study can provide reference for further analysis of mechanical properties of segments and joints.
【作者单位】： 合肥工业大学土木与水利工程学院;中国矿业大学深部岩土力学与地下工程国家重点实验室;中南大学资源与安全工程学院;
【基金】：国家自然科学基金项目(51304057) 深部岩土力学与地下工程国家重点实验室开放研究基金项目(SKLGDUEK1406) 安徽省住房城乡建设厅科学技术计划项目(2013YF-27)
【分类号】：U455.43
本文编号：2375900
[Abstract]:The mechanical properties of the joint of shield tunnel lining segment are very complicated. The local stiffness reduction method and the mechanical model of joint tension state are used to simulate the mechanical properties of shield tunnel segment. The mechanical and deformation characteristics of lining segment and joint longitudinal connection bolt are studied. The results show that the vertical displacement and large deformation range of the whole segment increase after the reduction of the local stiffness of the segment, the horizontal displacement of the segment is small, the horizontal displacement of the stiffness reduction area is slightly reduced, but the uniformity of the internal force distribution of the whole segment is affected. Based on the mechanical model of segment joint and the principle of deformation coordination, the deformation and variation law of longitudinal joint bolt is basically the same as that of integral segment, but the deformation is relatively small, and the reduction of horizontal deformation of bolt is higher than that of vertical one. The axial force of longitudinal connection bolt of segment joint is basically pressure, the bolt bearing pressure accounts for more than 94.4% of all bolts, and the bending moment and shear force are smaller, in which the bending moment is symmetrically distributed along the tunnel top and bottom, and the shear force is symmetrically distributed along the left and right sides of the tunnel. This study can provide reference for further analysis of mechanical properties of segments and joints.
【作者单位】： 合肥工业大学土木与水利工程学院;中国矿业大学深部岩土力学与地下工程国家重点实验室;中南大学资源与安全工程学院;
【基金】：国家自然科学基金项目(51304057) 深部岩土力学与地下工程国家重点实验室开放研究基金项目(SKLGDUEK1406) 安徽省住房城乡建设厅科学技术计划项目(2013YF-27)
【分类号】：U455.43
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，本文编号：2375900
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