为研究超大直径盾构隧道联络车行通道开挖过程中的结构安全和受力转换，比选设计出较为安全的临时加固措施，依托杭州市之江路输水管廊及道路提升工程，基于荷载-结构模式的实体离散管片数值模型，考虑接头螺栓及内置钢筋对隧道开口空间受力效应的影响，在利用足尺试验结果验证了计算方法的准确性后，采用弹塑性分析法研究管片开口后隧道结构的力学特性及开口影响范围；分析不同型式临时钢支撑以及不同临时钢框架的加固效果。结果表明：管片开口后，开口环段由于结构的不完整性使得临近管片螺栓孔处混凝土拉应力较为集中，进而产生破坏；开口对邻近完整管片的影响范围大致在开口环左右3环范围内；对于超大直径盾构隧道开口扩挖大开口的车行横通道，采用单一的钢支撑加固方式，管片结构的变形仍然较大；在临时钢支撑的基础上，结合临时钢框架，对隧道进行复合加固，开口环邻近的完整环的内力突增现象得到有效缓解，保证了隧道扩挖开口后结构的安全稳定。

In order to ensure the structural safety and force transfer during the excavation of the connection passage for superlarge-diameter shield tunnel, a comparative design of internal reinforcement measures was conducted. Based on the Hangzhou Zhijiang Road water conveyance gallery and road elevation project, a numerical model of solid discrete segments was established using a load-structure pattern. The influence of joint bolts and embedded steel bars on the stress distribution in the tunnel opening space was considered. The accuracy of the calculation method was verified through full-scale tests. The mechanical characteristics of the tunnel structure after segment opening and the range of opening influence were studied using an elastic-plastic analysis method. The reinforcement effects of different types of temporary steel supports and frames were analyzed. The results show that after the segment is opened, the concrete tensile stress near the bolt holes tends to concentrate due to the incompleteness of the structure, leading to failure. The range of influence on adjacent intact segments is approximately within three rings around the opening ring. For the cross passage with a large opening excavated in the vehicle lane of a superlarge-diameter shield tunnel, using a single steel support reinforcement method still results in significant deformation of the segment structure. Based on the temporary steel support, with the combination of the temporary steel frame, the tunnel is reinforced in a composite way. This effectively alleviates the sudden increase in internal force of the intact ring adjacent to the opening ring, thus ensuring the safety and stability of the tunnel structure after the expansion excavation opening.