在盾构隧道施工过程中,管片在外荷载作用下会出现接缝张开和错台变形,其中较大的环缝错台可能引起管片渗漏水不良病害。通过倾斜传感器串联接入无线网关方式实现了对环缝错台的实时监测,根据盾构施工特点将环缝错台监测数据划分为盾尾阶段、注浆阶段和趋于稳定阶段。通过对不同阶段管片环缝错台的时空特征分析,结果表明:盾尾内管片与盾尾逐渐接触的过程中,管片沿隧道轴向荷载分布不均导致盾尾内管片环缝错台相对于脱出盾尾管片沿隧道径向向圆心错动;注浆阶段管片环缝错台主要是由相邻管片环的受荷差异所造成的;盾尾内管片在拼装期间错台量基本呈线性发展,可考虑加大未回缩千斤顶推力对管片错台进行控制。研究成果可对环缝错台机理分析和控制研究提供数据支持和验证。

In the process of shield tunnel construction, the segment will appear under the action of external load joint opening and dislocation, in which the larger circumferential joint dislocation may cause water seepage and leakage of the segment adverse disease. Real-time monitoring of the ring joint dislocation is realized by tilting sensors connected in series to a wireless gateway, and the ring joint dislocation monitoring data are divided into the shield tail stage, grouting stage and stabilization stage according to the construction characteristics of the shield tunnels. Through the spatial and temporal characterization of the dislocation of the segment ring joint at different stages, the main conclusions are as follows: during the gradual contact between the segment and the tail of the shield, the axial load distribution of the segment along the tunnel is not uniform, resulting in the dislocation of the ring seams of the segment in the tail of the shield, relative to the dislocation of the segment in the tail of the shield along the radial axis of the tunnel to the center of the circle. The dislocation of the circumferential joint of the segment in the grouting stage is mainly caused by the loading difference of the neighboring segment rings. The dislocation in the tail of the shield is basically linear during the assembly period, and the dislocation can be controlled by considering the increase of the un-retracted jacking force. These findings can provide data support and verification for the analysis of ring dislocation mechanism and control research.