为解决盾构在砂性地层中长距离掘进可能存在的风险难题，以郑州地铁1号线2期工程为背景，分析盾构在砂性地层长距离掘进施工中可能存在的风险，在盾构掘进前针对所穿越地层的物理力学参数从耐磨性、刀盘开口率等方面对盾构进行适应性设计，在盾构掘进过程中通过现场试验确定合理的土体改良措施和注浆参数，最终顺利完成掘进。结果表明： 采取上述技术措施能够有效提高盾构在砂性地层中的耐磨性和掘进效率并且控制了地表沉降，从而克服了盾构在砂性地层中长距离掘进的施工风险。

The potential risks of longdistance boring of shield in sandy strata of Phase 2 of Zhengzhou Metro Line No. 2 are analyzed. The adaptability design of the shield machine is carried out in terms of wear resistance and cutterhead opening rate according to the mechanical parameters of sandy strata before shield boring. The rational ground conditioning methods and grouting parameters are decided by field test during shield tunneling. The results show that the wear resistance and the shield boring efficiency in sandy strata have been improved and the ground surface settlement has been controlled by adopting abovementioned technologies.