山岭隧道纤维抗裂混凝土抗压性能与本构关系试验研究  

Experimental Study on the Compressive Performance and Constitutive Relationship of Fiber Reinforced Anti-cracking Concrete in Mountain Tunnel

作　　者：刘汉宏 杨飞 康磊 王海林 欧阳宇 LIU Hanhong;YANG Fei;KANG Lei;WANG Hailin;OUYANG Yu(Hunan Provincial Communications Planning,Survey&Design Institute Co.,Ltd.,Changsha,Hunan 410200,China;Hunan Hengyong Expressway Construction and Development Co.,Ltd.,Changsha,Hunan 410018,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)

机构地区：[1]湖南省交通规划勘察设计院有限公司,湖南长沙410200 [2]湖南省衡永高速公路建设开发有限公司,湖南长沙410018 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《施工技术（中英文）》2024年第15期134-138,共5页Construction Technology

基　　金：湖南省自然科学基金(2020JJ5725);湖南省衡永高速公路建设开发有限公司科技课题:公路隧道抗裂防水“一体化”新技术研究及应用(HY2307ZX005)。

摘　　要：针对普通混凝土具有抗拉强度低、延性差的局限性,为满足山岭隧道二次衬砌抗裂防渗要求,提出采用纤维复合材料进行混凝土抗裂防渗的一体化性能提升,在混凝土中掺入包含PVA纤维及高分子活性材料的纤维复合材料。基于可压缩堆积模型进行纤维抗裂混凝土骨料最紧密堆积设计,并确定纤维抗裂混凝土配合比,通过开展抗压试验对纤维抗裂混凝土抗压力学性能及本构模型进行研究。研究结果表明,在混凝土中掺入纤维复合材料可提升抗压强度与韧性;存在最佳纤维复合材料掺量,当纤维复合材料掺量未超过最佳掺量时混凝土抗压强度及韧性均提升,当纤维复合材料掺量超过最佳掺量时混凝土抗压强度及韧性逐渐降低。To address the limitations of ordinary concrete,such as low tensile strength and poor ductility,and to meet the requirements of anti-crack and impermeability for the secondary lining of mountain tunnels,an integrated performance enhancement using fiber composite materials for anti-cracking and impermeability of concrete is proposed.Fiber composite materials,including PVA fibers and high-molecular active materials,are incorporated into the concrete.The compressible packing model is used to design the optimal aggregate packing for fiber reinforced anti-cracking concrete,and the mix ratio for fiber reinforced anti-cracking concrete is determined.Compressive tests are conducted to study the compressive mechanical properties and constitutive model of the fiber reinforced anti-cracking concrete.The research results show that incorporating fiber composite materials into the concrete can improve compressive strength and toughness.There exists an optimal fiber composite material content,when the content does not exceed this optimal level,both the compressive strength and toughness of the concrete are enhanced.However,when the content exceeds the optimal level,both the compressive strength and toughness of the concrete gradually decrease.

关 键 词：隧道 纤维 混凝土 抗压强度 破坏模式 本构关系 

分 类 号：TU528[建筑科学—建筑技术科学]