为解决联络通道施工中破除主隧道内高强度钢筋混凝土管片时扰动大、效率低、能耗高等问题，设计一种联络通道掘进机环切式刀盘。首先，分析传统联络通道施工方法的不足，提出利用环切式刀盘通过局部切削环槽破除钢筋混凝土管片的创新理念； 然后，基于该理念研制环切式刀盘掘进机，搭建足尺试验平台进行厂内试验，并对比环切方式与全断面切削方式的性能差异； 最后，将该环切式刀盘掘进机应用于苏州市轨道交通S1线联络通道施工中，对其实用性进行现场验证。结果表明： 1）环切式刀盘在切削钢筋混凝土管片时仅将管片切出1条环槽，对主隧道管片及地层的扰动小，可以保障施工安全； 2）切削时所需转矩和推力显著低于全断面刀盘，作业速度更快，能耗更低； 3）在实际工程中，该掘进机成功完成了接收端钢筋混凝土管片的快速破除，施工周期短，验证了其先进性和工程适用性。

The breaking of high-strength reinforced concrete segments in main tunnel construction presents challenges such as large disturbance, low efficiency, and high energy consumption. To address these limitations, a circumferential-cutting type cutterhead designed for connection tunnel boring machines is introduced. First, the shortcomings of traditional connection tunnel construction methods are analyzed, and an innovative method that breaks reinforced concrete segments through local cutting ring grooves using a circumferential-cutting type cutterhead is proposed. Second, a tunnel boring machine with a circumferential-cutting cutterhead is developed based on this concept, along with a full-scale test platform for in-plant testing. These experiments specifically assess performance differences between circumferential and full-section cutting methods. Finally, the developed equipment is applied to the connection tunnel of the  Suzhou rail transit line S1 to verify its field practicability. The results reveal the following: (1) By cutting only a single ring groove, disturbance to the reinforced concrete segments and surrounding strata of the main tunnel is extremely low, thereby ensuring construction safety. (2) The required torque and thrust are significantly lower than those of the full-section cutterhead, resulting in higher working speed and lower energy consumption. (3) The equipment successfully facilitates the rapid removal of the reinforced concrete segment at the receiving end within a short construction period, verifying its advanced design and engineering applicability.