西安地铁全断面无水砂层盾构施工技术

摘要

针对无水砂层的特点,从土压平衡盾构机选型、渣土改良、刀盘开口率大小及能否顺利建立土压平衡几个方面进行了试验、分析和研究,确定了渣土改良的配比和合理掺量,并结合工程实际进行了验证和完善,使盾构机安全顺利地通过该地层并且取得了一定的经济效益,从而解决了盾构机穿越无水砂层的难题,可为今后施工类似地层提供经验。%In this paper,in light of the characteristics of anhydrous sand stratum,some tests,analysis and researches have been made in such aspects as the EPBM type selection,muck improvement,appropriate cutter head opening rate size,and the earth pressure balance can be established successfully or not,etc.Then the proportion and the rational added quantity of the muck improvement are determined,and have been tested and perfected to enable the shield construction machine move through the strata in a safe and smooth way and obtain certain economic benefits.Thus it solves the problem of the shield construction machine moving through the anhydrous sand stratum,provides reference for similar stratum construction.