以北京地铁 19 号线支线清河站南侧盾构区间为例，对盾构全水中接收各阶段工序、风险和控制参数进行 分析，得出了相应的风险控制措施，并得到了成功应用。盾构全水中接收参数控制及监测数据表明：全水中接收 盾构井灌水高度在实测水位以上 0.5 m～1 m，可有效控制盾构接收涌水涌砂情况；接收期间土压力从 15 环的 0.08～0.12 MPa 逐渐降低为 0，适当提高同步注浆量至理论值 1.25 倍，推进速度 5.1 mm/min，接近围护桩 2 环时推力 从 9 000 kN 升至 20 000 kN，磨桩期间推力在 9 000～14 000 kN，风险可控；沉降发生主要有两个阶段，即刀盘 出洞及盾尾脱出阶段，各占 0.9～1.5 mm，4.0～4.8 mm，盾尾脱出影响大于刀盘出洞影响。

Based on the shield tunnel construction section on the south side of the Qinghe station, of the Beijing Metro Line 19 project, the procedures, risks, and control parameters of each stage of the underwater reception of shield machines were analyzed, and the corresponding risk control measures were obtained and successfully applied. The shield parameters and monitoring results indicated that: when the height of filled water is 0.5～1 m above the ground level, water and sand spewing can be effectively controlled. During the receiving period, the earth pressure gradually decreased from 0.08～0.12 MPa of the 15th ring to 0 bar, the synchronous grouting amount was appropriately increased to 1.25 times of the theoretical value, and the advance speed was 5.1 mm/min. When the shield was approaching the 2nd ring of the retaining pile, the thrust increased from 9 MN to 20 MN, and during the grinding pile period, the thrust was between 9 MN and 14 MN, and the risk was controllable. The settlement mainly occurred in two stages: the stage of the cutter head exiting the tunnel and the stage of the shield tail exiting the tunnel. The settlement values were in the range of –0.9～–1.5 mm and –4.0 mm～–4.8 mm. The influence of the shield tail exiting the tunnel was greater than that of the cutter head exiting the tunnel.

U231

北京市轨道交通建设管理有限公司双创基金项目(SCJJ2019005)