摘要：以苏州地铁5号线塔竹区间隧道工程为依托,依据工程特性,介绍了冻结设计原理和钢套筒应用原理,对水平冻结法端头加固、钢套筒组装、钢套筒辅助盾构施工及洞门密封、封闭车站盾构暗掉头等施工关键技术进行了详细阐述,并对冻结法施工进行了数值模拟,分析了积极冻结期冻胀位移变化。实践表明:在盾构接收和始发前,通过采用冻结法对盾构接收和始发井范围内的土体进行加固,达到了降低土体渗透性和提高土体强度的双重目的,降低了破除洞门时土体自立性差带来的风险;钢套筒的密闭空间提供平衡掌子面的水土压力,很大程度上降低了盾构接收时涌水涌砂风险。
关键词：封闭环境盾构施工技术冻结法钢套筒位移
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[10] 钱新．无水砂卵石地层土压平衡盾构刀盘防卡死关键技术[J]．施工技术,2020,49(8):120-124．
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Research on Key Technology of Freezing-assisted Steel Sleeve Shield Construction in Closed Environment
Abstract: Based on Tazhu Interval Tunnel project of Suzhou Metro Line 5,according to the specificity of the project,the freezing design principles and the application principles of steel sleeves are introduced.The key construction techniques such as the end reinforcement of the horizontal freezing method,the steel sleeves assembly,the construction of auxiliary shields with steel sleeves and the sealing of tunnel doors,and shield turned around in closed stations are elaborated. The freezing method construction is numerically simulated,and the frost heave displacement changes during the active freezing period is analyzed. Practice shows that before the shield receiving and launching,the freezing method is used to strengthen the soil within the shield receiving and launching wells,which achieves the two-way effect of reducing soil permeability and improving soil strength,and the risk of poor soil self-reliance when breaking the door. The confined space of the steel sleeve provides balanced water and soil pressure on the tunnel face,which greatly reduces the risk of water and sand inrush when the shield is received.
Keywords: closed environment; shields; construction; freezing; steel sleeve; displacement
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