以上海苏州河段深埋调蓄盾构隧道工程为背景, 采用多功能回型框架试验系统对3 组不同纤维混凝土和 1 组无纤维混凝土浇筑的管片梁和管片接头进行足尺静载试验, 探究 了 3 种纤维混凝土对深埋调蓄盾构隧道管片力学性能的影响. 管片梁试验结果表明: 合成纤维 可以提高混凝土的抗拉能力, 在内水压达到 0.5 MPa 时不同纤维可使钢筋应力降低 8%∼22%不等; 合成纤维可以有效延缓裂缝的出现并抑制其发展, 其中 Barchip 纤维管片裂缝宽度降低 了 40%, 同维纤维降低了 20%, 钢纤维降低了 28%. 管片接头试验结果表明: 合成纤维可以提 高接头试件的整体刚度, 其中 Barchip 纤维提高了 24%, 同维纤维提高了 10%, 钢纤维提高了17%; 合成纤维混凝土可以有效降低接头受压区在螺栓屈服时出现碎角破坏的程度. 总体而言, Barchip 纤维在抑制裂缝发展和提高管片和接头整体刚度等方面的表现均优于钢纤维, 而同维 纤维在相关方面的表现则劣于钢纤维.

Taking the deeply-buried water storage and sewage shield tunnel project implemented in Suzhou River of Shanghai as the background, the full-scale static load tests of segment beams and joints poured with three groups of different fiber reinforced and one group of non-fiber reinforced concrete were carried out. The tests were conducted using the multi-functional return frame test system to explore the effects of three kinds of fiber reinforced concrete on the mechanical properties of segments of deeply-buried water storage and sewage shield tunnel. The results of segment beam test demonstrated that synthetic fiber improved the tensile capacity of concrete. When the internal water pressure reached 0.5 MPa, different fibers could reduce the stress of reinforcement by 8%∼22%; moreover, synthetic fiber could effectively delay the occurrence and inhibit the development of cracks. The crack width of Barchip fiber segment was reduced by 40%, that of T&W fibers was reduced by 20%, and that of steel fiber was reduced by 28%. The results of segment joint test indicated that synthetic fiber could improve the overall rigidity of joint specimens; accordingly, the strength of Barchip fiber was increased by 24%, that of T&W fiber was increased by 10%, and that of steel fiber was increased by 17%. The synthetic fiber-reinforced concrete could effectively reduce the degree of broken corner failure in the joint compression zone when the bolt underwent yielding. In general, Barchip fiber performed better than steel fiber in inhibiting crack development and improving the overall rigidity of segments and joints, while the T&W fiber performed slightly worse than steel fiber.