不同纤维材料对混凝土管片接头性能影响  

Influence of Different Fiber Materials on the Performance of Concrete Segment Joints

作　　者：周春煦 赵立财 朱俊高[3] ZHOU Chunxu;ZHAO Licai;ZHU Jungao(Department of Naval Architecture and Ocean Engineering,Jiangsu Shipping College,226010,Nantong,China;The Third Engineering Co.,Ltd.,China Railway 19th Bureau Group Co.,Ltd.,110136,Shenyang,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,210098,Nanjing,China)

机构地区：[1]江苏航运职业技术学院船舶与海洋工程系,南通226010 [2]中铁十九局集团第三工程有限公司,沈阳110136 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098

出　　处：《城市轨道交通研究》2024年第12期271-277,共7页Urban Mass Transit

基　　金：江苏省高职院校教师专业带头人高端研修项目(2021GRGDYX007);南通市科技计划项目(MSZ21096);辽宁省“兴辽英才计划”青年拔尖人才资助项目(XLYC2007146)。

摘　　要：[目的]普通混凝土管片由于本身抗拉强度低,抗冲击性能不强,在运输施工过程中容易出现开裂变形等问题,而外加纤维是有效防治其缺陷的方法。因此,有必要研究不同纤维材料对混凝土管片接头性能的影响。[方法]通过室内试验设计了含有钢纤维、聚丙烯纤维及两种混杂纤维的混凝土管片,并与普通无外掺料的混凝土管片进行对比试验,分析不同类型外掺料及外掺料掺量对混凝土管片接头处抗压、抗弯和抗拔性能的影响。在确定最优外掺料材料的基础上,研究不同掺量比对混凝土管片接头处力学性能的影响。[结果及结论]纤维的加入能够有效阻止混凝土管片接头处的裂缝发展,其中混杂纤维混凝土对混凝土管片接头处的整体性能改善最为明显,且纤维掺量越多,越能有效阻止混凝土管片接头处的裂缝发展。从管片裂缝发育特征上看,随着纤维的加入,几乎无贯通性裂缝发育。纤维掺量越多时,这种改善裂纹发育的表现越明显。[Objective]Due to their low tensile strength and poor impact resistance,ordinary concrete segments are prone to problems such as cracking and deformation during the transportation and construction process.Adding fibers is an effective way to prevent and control these defects.Therefore,it is necessary to study the effects of different fiber materials on the performance of concrete segment joints.[Method]Through indoor tests,concrete segments containing steel fibers,polypropylene fibers and two types of mixed fibers are designed,and compared with ordinary concrete segments without admixtures,so as to analyze the effects of different types and dosages of admixtures on compression,bending and pull-out properties at concrete segment joints.On the basis of determining the optimal admixture materials,the effects of different admixture dosages on the mechanical properties of concrete segment joints are studied.[Result&Conclusion]The addition of fibers can effectively prevent the crack development at concrete segment joints,among which the concrete with mixed fibers has the most obvious improvement on the overall performance of the concrete segment joints.The greater the fiber dosage,the more effective it is in preventing crack development at the joints.From the perspective of the crack development characteristics of the segments,with the addition of fibers,almost no visible development of penetrating cracks.The greater the fiber dosage,the more obvious this improvement is in crack development.

关 键 词：隧道 混凝土管片 纤维材料 管片接头性能 

分 类 号：U457[建筑科学—桥梁与隧道工程]