中文摘要：

针对武汉长江隧道承受高水压和穿越高渗透性砂性土质的特点，在相似模型试验中专门采用盾构隧道-地层复合体模拟试验系统和旋转式水压装置共同作用，实现对水压和土压的分别控制加载，完成水土分算和水土合算的不同水土压力场条件下管片衬砌结构力学特征的模型试验，最后对高水压和变水压条件下的管片衬砌结构力学变化规律进行了分析。研究表明，高水压条件下的管片衬砌结构最大正负弯矩、最大变形量和结构偏心矩整体水平均有明显偏小，而平均轴力水平有明显提高；随着水压力加大，管片衬砌结构的平均轴力明显增大，最大正负弯矩略有增长或基本不变，最大偏心矩明显减小。该研究为武汉长江盾构隧道的衬砌结构设计提供有价值的参考。

英文摘要：

Wuhan Yangtze river tunnel is under high water pressure and is driven through high permeability sandy soils. A test model of the segment lining structure is designed by using a shield tunnel-ground simulation facility and a rotary water pressure device to control the water pressure and the earth pressure separately. The mechanical characteristics of the segment lining structure under high and varied water pressure are analyzed. The study indicates that under high water pressure, the maximum bending moment, deformation and eccentricity are all comparatively small, whereas the average axial force increases significantly. With the water pressure increasing, the average axial force of the segment lining structure increases and the maximum eccentricity decreases, while the maximum bending moment increases only slightly or remains unchanged.