基于电缆隧道修复的玄武岩纤维棒高韧性水泥基材料性能研究  

Research on the performance of high toughness cementitious material reinforced with basalt fiber bar for cable tunnel repairs

作　　者：王大为[1] 郑天宇 焦宇阳 王健[1] 朱乐喜 崔圣爱[2] WANG Dawei;ZHENG Tianyu;JIAO Yuyang;WANG Jian;ZHU Lexi;CUI Sheng′ai(State Grid Beijing Electric Power Company,Beijing 100031,China;Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]国网北京市电力公司,北京100031 [2]西南交通大学,四川成都610031

出　　处：《混凝土》2025年第3期108-113,共6页Concrete

基　　金：国家自然科学基金(52278277);四川省国际科技创新合作项目(2023YFH0061)。

摘　　要：电缆隧道所处地下环境复杂,受地层变形及腐蚀性介质影响结构裂损及渗漏水等问题严重.目前所采用的传统修复材料对于短时间内解决电缆隧道劣化问题具有一定的作用,但是长期性能无法保障.采用玄武岩纤维棒(BFB)作为增韧组分,设计玄武岩纤维棒高韧性水泥基修复材料,研究BFB不同体积掺量下水泥基材料的抗压强度、抗折强度以及单轴拉伸力学性能,获得其基本力学性能参数.基于抗折试验荷载-挠度曲线,采用ASTM C1018韧性评价标准计算韧性指数.依据单轴拉伸试验应力-应变曲线确定极限拉伸应变.采用CT测试技术及图像分析软件Avizo分析玄武岩纤维棒高韧性水泥基材料孔隙结构.研究结果表明:掺入玄武岩纤维棒后,试件的抗压强度和抗折强度均有明显提高,但其抗压强度随BFB体积掺量的提高呈缓慢降低趋势.当BFB体积掺量为2.5%时,复合材料抗折韧性最佳,韧性指数为I5=8.36,I10=17.86.掺入玄武岩纤维棒后,试件的极限拉伸应力和极限拉伸应变显著提升,脆性有明显改善,当纤维棒体积掺量为3.0%时,极限拉伸应变达为4.68%,且表现出应变硬化特征.同时,掺入玄武岩纤维棒对复合材料孔隙结构影响很小,提高纤维棒掺量,孔隙结构没有明显变化.研究成果对于老旧电缆隧道渗漏水修复加固具有重要的工程应用价值。Cable tunnels located underground are subject to complex environmental conditions,including ground deformation and corrosive media,which lead to structural damage and water leakage issues.Currently used traditional repair materials offer temporary solutions to cable tunnel deterioration,but their long-term performance cannot be guaranteed.In this study,basalt fiber bar(BFB)was used as a toughening component to design high toughness cementitious repair material.The compressive strength,flexural strength,and uniaxial tensile mechanical properties of cementitious materials with different volumes of BFB were investigated to obtain their basic mechanical performance parameters.Based on the load-deflection curve obtained from flexural tests,the toughness index was calculated using the ASTM C1018 toughness evaluation standard.The ultimate tensile strain was determined based on the stress-strain curve obtained from uniaxial tensile tests.CT testing technique and image analysis software Avizo were used to analyze the pore structure of the high toughness cementitious material reinforced with basalt fiber bar.The research results showed that the addition of basalt fiber bar significantly improved the compressive strength and flexural strength of the specimens.The compressive strength exhibited a gradual decrease with the increase of BFB volume fraction.When the BFB volume fraction was 2.5%,the composite material showed the best flexural toughness,with toughness indices of I5=8.36 and I10=17.86.The addition of basalt fiber bar also significantly increased the ultimate tensile stress and ultimate tensile strain of the specimens,and improved their brittleness.When the volume fraction of fiber rods was 3.0%,the ultimate tensile strain reached 4.68%,and exhibited strain hardening characteristics.Furthermore,the addition of basalt fiber rods had a minimal effect on the pore structure of the composite material,as increasing the fiber rod content did not result in significant changes in the pore structure.The research findings have

关 键 词：老旧电缆隧道 裂损修复 高韧性玄武岩纤维棒水泥基材料 抗折强度 单轴拉伸 孔隙结构 

分 类 号：TU528.041[建筑科学—建筑技术科学]