为研究砂卵石地层中管片的力学行为，以兰州地铁1号线穿黄段为研究对象，采用改良的测试传感器走线方式，对管片内力及外部水压力进行现场测试，并进行相应的数值模拟。将现场测试数据与数值模拟结果对比分析，得出如下结论： 1）外部水压力及管片内力受盾构施工影响最为显著的范围为距掌子面3~5环，在此范围内应加强对受拉区的监测，并采取相应措施防止管片在施工初期破损； 2）外部水压力及管片内力在距掌子面6~13环时受施工影响逐渐降低，距掌子面13环后趋于稳定； 3）运用梁-弹簧模型设计管片是偏于安全的，但应充分考虑施工荷载。

Lanzhou Metro Line No. 1 is the first underwater tunnel project which crosses the Yellow River and belongs to urban rail transit. The tunnel passes through high permeability sandycobble strata, and the engineering condition is special. The mechanical behavior of segment in different construction stages and the water pressure acting on the segment are analyzed through insitu test and numerical simulation, and the variation rules of segment internal force in different construction stages are revealed. The research results show that: 1) The external water pressure and internal force are significantly affected by the construction of shield in the range of 3-5 rings to the tunnel face, within which the strengthen detection methods should be used at the tensile zone and corresponding measures should be taken to prevent the damage of the segment in the early stage of construction. 2) The water pressure and internal force are gradually unaffected by construction in the range of 6-13 rings and tend to be stable after the 13th ring. 3) The segment designed by beamspring mode is safe, but the construction load should be fully considered.