收敛变形对地铁盾构隧道纵向等效抗弯刚度的影响研究  

Study on the Influence of Convergence Deformation on the Longitudinal Equivalent Rigidity of the Metro Shield Tunnel

作　　者：李明宇[1] 姜平远 郭逸凡[1] 

机构地区：[1]郑州大学土木工程学院,郑州450001

出　　处：《结构工程师》2015年第6期46-53,共8页Structural Engineers

基　　金：国家自然科学基金项目(50978235)

摘　　要：基于场试验监测数据,对等效连续化模型进行了修正,考虑了隧道收敛变形对结构纵向变形的影响,并将该计算方法与现有计算理论方法进行了对比。弯曲状态下,环缝位置不考虑剪切作用时,随着隧道收敛变形的增加,拱底环缝张开量最大值、管片拉压应力和螺栓拉应力均略有减小。结构纵向变形曲率半径越小,隧道收敛变形对其影响越显著。在大曲率半径隧道结构纵向变形状态下,隧道收敛变形对结构纵向变形的影响可以忽略;不考虑轴向拉伸导致结构纵向变形条件下,结构弯曲导致的拱底环缝张开量较小。Based on the field test monitoring data, structural longitudinal deformation was studied by modifying the equivalent continuous model by considering tunnel convergence. Comparison between the existing theoretical methods and the proposed method was made. At the ring joints, if shearing is not considered, the maximum ring joint open, the segment tension and compression stress, and the bolt stress slightly decrease with the increase of tunnel convergence deformation under bending. The smaller the curvature radius, the more influence it has on structural longitudinal deformation. The ring joint open becomes larger under the influence of tunnel convergence. With a large curvature radius and the structural longitudinal deformation, the influence of tunnel convergence can be neglected. Without considering the axial tensile deformation of a structure, the ring joint open is small under pure bending.

关 键 词：盾构隧道 收敛变形 纵向变形 等效弯曲刚度 

分 类 号：U231.3[交通运输工程—道路与铁道工程] U455.43[建筑科学—桥梁与隧道工程]