考虑开洞影响的装配式竖井管片与内衬共同作用分析

    Analysis of interaction between prefabricated vertical shaft and its lining structures considering impact of openings

    • 摘要: 装配式竖井施工技术因其施工效率高、占地面积小及环境影响小等特点在城市地区竖井建设中具有显著优势。作为顶管或盾构井的装配式竖井,往往会在井内再设置一层现浇内衬结构以保证开洞安全。建立三维有限元模型分析了装配式竖井管片与内衬的共同作用机理,由于竖井管片环间连接薄弱,模型中忽略了管片环间的连接。计算结果表明,管片与内衬弯矩近似按刚度比值分配,管片开洞后最大弯矩均位于洞口及井底板附近。相对不考虑管片作用时,考虑共同作用后内衬弯矩仅为不考虑管片作用时的56%~76%。

       

      Abstract: Prefabricated vertical shaft construction technology has significant advantages in urban areas due to its high construction efficiency, small construction site area and minimal environmental impact. When serving as jacking or shield tunneling wells, an additional layer of lining structure is often installed inside the shaft to ensure the safety of opening construction. A three-dimensional finite element model is established to analyze the joint mechanism between the prefabricated vertical shaft segments and the linings. Due to the weak connection between the vertical shaft segments, the connection between the segments is ignored in the model. The calculation results indicate that the bending moments of the segments and linings are approximately distributed according to their stiffness ratio. The maximum bending moment of the segments after opening is located near the opening and bottom of the well. Compared with the model which ignored the effect of segments, the bending moment of the lining considering the segments is only 56% to 76% of that without considering the segments.

       

    /

    返回文章
    返回