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

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.