摘要
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 im-plemented 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 in-creased 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.
作者
张金生
庄欠伟
李东
张弛
ZHANG Jinsheng;ZHUANG Qianwei;LI Dong;ZHANG Chi(Department of Civil Engineering,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China;Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032,China)
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第4期758-768,共11页
Journal of Shanghai University:Natural Science Edition
基金
上海市启明星人才计划资助项目(20QB1401800)。
关键词
纤维混凝土
足尺静载试验
管片接头
力学
fiber concrete
full-scale static load test
segment joints
mechanics
