Summary of shield construction difficulties and key technologies in backfill area
回填土地段盾构施工难点与关键技术总结

摘要

某地铁鲁家沟站～椿萱大道站区间覆土为回填土、杂填土、硬质岩、泥岩相结合的复杂土地段，TBM盾构机在填土段采用土压平衡模式TBM模式，其他地层段采用单护盾TBM模式，针对复杂地质状况下的施工过程当中，掘进过程中容易发生刀具磨损，堵塞刀盘，掘进沉降等盾构施工难点，本文从地层结构、盾构掘进参数、刀盘磨损、对周边建筑物的影响采取的相关措施进行总结，以期为相近条件下的盾构施工提供技术参考。

Abstract

The overburden soil between Lujiagou Station and Chunxuan Avenue Station of a subway is a complex land section combining backfill, miscellaneous fill, hard rock and mudstone. The TBM shield machine adopts the soil pressure balance mode TBM mode in the fill section, and the other strata section adopts the single shield TBM mode. In view of the construction process under complex geological conditions, the shield construction difficulties such as tool wear, blockage of cutterhead and tunneling settlement are easy to occur in the tunneling process. This paper summarizes the relevant measures taken from the stratum structure, shield tunneling parameters, cutterhead wear and the influence on surrounding buildings, in order to provide technical reference for shield construction under similar conditions.