【摘要】 VSM(垂直竖井挖掘法或垂直盾构)工法近年来逐步应用于我国城市中心各类超深竖井的建造。该类竖井多为管片装配式结构，与普通现浇式整体竖井及水平向管片隧道结构，在力学机制及力学行为上都存在较大不同。鉴于此，考虑竖向管环间接缝刚度及分步下沉、拼装过程的影响，建立了装配式竖井竖向多铰弹性地基梁增量法计算模型，并给出了其解析方法。研究结果表明：(1)本文所建立的解析模型与数值分析及经典解析结果吻合较好，能准确反映竖井下沉过程中的结构变形及内力变化规律；(2)模型参数中，地层荷载及下沉深度等对竖井内力及变形均存在较大影响，其中沿深度变化的地层荷载影响最为显著；(3)圆形装配式竖井结构沿竖向整体呈现“倒锥形”的缩颈变形，沿深度线性增加直至靠近底部的3～4环位置附近，此时的弯矩及剪力也同时达到最大；(4)不同深度下的圆环间产生差异径向收敛变形，向上下两侧传递，导致相邻环间发生剪切。当环间剪切力超过环缝抗剪限值时，竖井环间接头存在剪切错台的风险。更多还原

【Abstract】 In recent years, the VSM(vertical shaft sinking machine) method has been increasingly applied in the construction of various types of ultra-deep shafts in urban centers across China.These shafts are typically segment-assembled structure, differing significantly in mechanical mechanisms and behaviors from traditional monolithic cast-in-place shafts and horizontal segmental tunnel structures.Considering the stiffness of the joints between vertical rings and the effects of stepwise sinking and assembly processes, an incremental calculation model of a vertically multi-hinged elastic foundation beam model was established, and the analytical solution was provided.The results show:(1)The analytical model established herein aligns well with numerical analyses and classical analytical results;(2)Strata load and sinking depth significantly influence the internal forces and deformations of the shaft structure, with the load varying along the depth having the most pronounced effect;(3)The vertical deformation of circular assembled shaft structures displays a ‘truncated cone’ shape, necking towards the bottom near the last 3-4 rings where bending moments and shear forces also reach their peak;(4) Differential radial convergence at various depths causes localized uneven deformations that propagate vertically, leading to shear between adjacent rings. When the inter-ring shear force exceeds the joint’s shear resistance, there is a risk of shear offsets at the joints between rings.更多还原