隧道TBM施工采用有轨运输方式出碴时，掘进过程中矿车卸碴布料涉及工序较多，且牵引列车编组的内燃机车持续运行会增加尾气排放，造成隧道内空气污染。应用于青岛地铁隧道施工的双护盾TBM的后配套配置了移动式布料皮带机，该皮带机可实现往复移动和正反向运行为矿车卸碴布料。对该移动式布料皮带机的工作原理、结构组成、移动方式、张紧方式和驱动方式等进行研究，并分析其应用效果。实践证明，该技术应用于TBM后配套出碴可行、实用，简化了施工工序并提高了工作效率。

When adopting track transportation for mucking of tunnel constructed by TBM, the mucking process of muck car is always complicated and the continuous operation of the diesel locomotive for the traction of train marshalling will increase the exhaust emission. As a result, the mobile shuttle conveyor is equipped with the backup system of doubleshield TBM used in Qingdao Metro tunnel, which can realize forward and backward movement and clockwise and anticlockwise running for mucking of muck car. The principle, structural components, moving mode, tensioning mode and driving mode of the mobile shuttle conveyor are studied and its application effect is analyzed. The results show that the abovementioned technology is feasible and practical to the backup mucking of TBM, which can simplify the construction process and improve the working efficiency.