钢纤维混凝土抗弯性能及大直径管片应用试验研究  

Experimental Study on Flexural Performance of Steel Fiber Reinforced Concrete and Application of Large-Diameter Shield Segments

作　　者：王剑宏 夏志鹏 陈超军 孙会彬 王世兴 田雨 胡云发 陈健[4] WANG Jianhong;XIA Zhipeng;CHEN Chaojun;SUN Huibin;WANG Shixing;TIAN Yu;HU Yunfa;CHEN Jian(School of Qilu Transportation,Shandong University,Jinan 250002,China;School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,China;China Railway 14th Bureau Group Fangqiao Corporation Limited,Beijing 102400,China;China Railway 14th Bureau Group Corporation Limited,Beijing 102400,China)

机构地区：[1]山东大学齐鲁交通学院,山东济南250002 [2]山东建筑大学交通工程学院,山东济南250101 [3]中铁十四局集团房桥有限公司,北京102400 [4]中铁十四局集团有限公司,北京102400

出　　处：《应用基础与工程科学学报》2025年第1期244-255,共12页Journal of Basic Science and Engineering

基　　金：国家重点研发计划项目(2021YFB2600800);国家自然科学基金项目(52130808,52178390)。

摘　　要：为探明钢纤维强度及形状对钢纤维混凝土(SFRC)抗弯性能的影响,验证大直径SRFC管片工程应用的可行性,依托穿黄北延项目,选用不同强度和长径比钢纤维开展四点弯曲加载破坏试验,结合DIC技术观察裂缝演变,并针对容易发生管片开裂的负环施工开展现场监测试验.研究结果表明:(1)相较于较混凝土(RC)梁,SFRC梁具有良好的残余强度,SFRC梁抗弯破坏大致可分为4个阶段:裂缝萌生阶段、裂缝发展阶段、失稳扩展阶段及破坏阶段;(2)钢纤维抗拉强度越高,越有助于提高抗拉强度及弯曲韧性;钢纤维长径比越大,残余抗弯强度越高,但对抗拉强度影响较小;(3)顶推荷载作用下无约束负环SFRC管片表现出良好性能,证明了其在大直径盾构隧道应用的可行性.To investigate the influence of steel fiber strength and shape on the flexural performance of steel fiber reinforced concrete(SFRC)and verify the feasibility of engineering application of large-diameter SRFC segments.This study relies on the Yellow River North Extension Project,which selects steel fibers with different strengths and aspect ratios to carry out four-point bending tests,uses DIC technology to observe crack evolution,and conducts field monitoring tests on negative ring segments.The results show that:(1)Compared with reinforced concrete(RC)beams,SFRC beams have better residual strength.The SFRC beam bending failure can be roughly divided into four stages:crack initiation stage,crack development stage,instability expansion stage,and failure stage;(2)The higher the tensile strength of steel fibers,the more beneficial it is for improving both tensile strength and flexural toughness.A higher aspect ratio of steel fibers results in higher residual flexural strength,but has a smaller impact on tensile strength;(3)Under the jacking load,the negative ring SFRC segment shows good performance,proving its feasibility in large-diameter shield tunnels.

关 键 词：钢纤维混凝土 大直径管片 DIC分析 抗裂性能 抗弯韧性 管片应用 

分 类 号：TU528.572[建筑科学—建筑技术科学]