复杂地层泥水盾构开仓换刀施工技术研究

摘要

Research purposes:There are many uncertainties in opening compartment and changing cutleries of the slurry shield in water - rich sand layer, and the technologies of the opening compartment and changing cutleries are not mature enough. In this paper, the construction process and the technical parameters about the opening compartment of the shield in actual construction in the complex stratum are summed up for providing the reference and basis to the further research on the technologies for opening compartment and changing cutleries of the shield and to the similar works.Research conclusions:From the research on the technologies for opening compartment and changing cutleries of the shield in the complex stratum, it is concluded the clay membrane with the average thickness above 5cm must cover the entire soil of the working face. The feeding and compressing compartment must be done step by step at the same time.The pressure should be reduced step by step. The pressure needed for forming the clay membrane should be bigger than the cutting pressure by 0.5 bar.%研究目的:盾构在复杂富水砂层中开仓作业施工存在诸多不确定性,该技术在目前还不够成熟,本文以实际工程为依托,总结盾构在复杂地层中开仓的施工工艺及参数,为进一步研究盾构开仓技术提供参考,同时为类似工程提供借鉴.研究结论:通过对富水砂层中地层盾构开仓换刀施工技术的研究,得出:施工要求泥膜全部覆盖掌子面土体且泥膜平均厚度5 cm以上；进仓过程和加压过程同时分步进行；降压过程也要分步分阶段进行；泥膜加压形成需要的压力比切口压力高出0.5bar是合适的.