盾构施工作为先进的地下空间非开挖技术，近年来在市政工程中的应用越来越广，但地下隧道盾构施工经常会因刀具磨损、清除泥饼和更换刀具等原因，需要施工人员进入土舱内作业。由于土舱与开挖面存在刀盘开口，开挖面坍塌、涌水或涌砂等都会对舱内作业造成很大的威胁，因此，开舱作业在很大程度上受到了地质条件的制约。通过在砂层浅覆土段进行盾构气压开舱施工实践，对不良地层气压开舱作业中存在的问题进行了探讨。%The shield construction of underground space as an advanced trenchless technology applications in recent years in municipal engineering more widely, but often underground tunnel shield construction due to tool wear, remove the cake and replacement of tools and other reasons, need construction workers work with soil compartment. Due to constraints cutter opening, excavation face collapse, gushing or Bay sand so will cause a great threat cabin operations, therefore, open space operations to a large extent by the geological conditions soil tank and the excavation face. By sand shallow overburden pressure cabin opening segment of shield construction practice, the formation of non-performing open cabin pressure problems in the job were discussed.
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