硫酸盐环境下含非贯通裂缝隧道衬砌注浆及二次腐蚀试验研究  

Study on crack grouting and secondary corrosion of tunnel lining with non-through cracks in sulfate environment

作　　者：刘新荣[1,2,3] 庄炀 周小涵 张馨元 陈海 LIU Xinrong;ZHUANG Yang;ZHOU Xiaohan;ZHANG Xinyuan;CHEN Hai(School of Civil Engineering,Chongqing University,Chongqing 400045,China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400045,China;National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area(Chongqing),Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400045 [3]重庆大学库区环境地质灾害防治国家地方联合工程研究中心(重庆),重庆400045

出　　处：《岩石力学与工程学报》2024年第11期2627-2638,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金青年基金资助项目(52104076);重庆市博士后研究项目特别资助项目(2022CQBSHTB1010)。

摘　　要：裂缝注浆后隧道衬砌的长期耐久性对裂缝整治措施的选取与改进具有重要的指导意义。为探究临空面蒸发型硫酸盐腐蚀状态下,非贯通裂缝注浆对隧道衬砌混凝土在二次腐蚀时受压特征变化规律的影响,基于现场调查结果,开展为期420d的含非贯通裂缝混凝土注浆及二次腐蚀试验,并进行单轴压缩和声发射测试。试验结果表明:受硫酸盐侵蚀混凝土的受压破坏特征由未腐蚀时的对顶角锥破坏转变为迎水面整体剥落破坏。非贯通深裂缝加速硫酸盐环境下混凝土的强度损失。单轴压缩过程中,声发射I-IV阶段与应力-应变曲线中的压密阶段、弹性阶段、屈服阶段和峰后阶段对应良好。随腐蚀时间的增加,试件受压屈服点提前,声发射阶段II的占比减小,阶段III的占比增大。非贯通裂缝注浆提升混凝土的即时强度,并降低其在二次腐蚀时的强度损失,但未改变混凝土在受压过程中的破坏特征和声发射特征性质,且随着注浆时间的延后,注浆效果降低。The long-term durability of the tunnel lining following crack grouting serves as a major guiding principle in the choice and enhancement of crack treatment techniques.According to the field investigation,a 420-day crack grouting and secondary corrosion test of concrete with non-through cracks was carried out,along with uniaxial compression and acoustic emission tests,in order to examine the impact of non-through crack grouting on the compressive characteristics of tunnel lining concrete under the secondary sulfate corrosion of free surface evaporation.The test findings demonstrate that the compressive failure features of concrete corroded by sulfate change from diagonal conical failure to full spalling on one side of the attacked surface.In addition,non-through deep cracks accelerate the strength loss of concrete in a sulfate environment.During the uniaxial compression,the acoustic emission stages I-IV show good agreement with the stress-strain curve in the following stages:the compression stage,elastic stage,yield stage,and post peak-stage.Furthermore,with increasing the corrosion time,the compression yield point of the specimen advances,the proportion of stageⅡdecreases,and the proportion of stageⅢincreases.Non-through crack grouting increases the concrete?s immediate strength and decreases its strength loss during secondary corrosion.However,non-through crack grouting had no effect on the concrete?s damage or acoustic emission characteristics during the compression process,and the grouting effect diminishes as the grouting time increases.

关 键 词：隧道工程 裂缝注浆 非贯通裂缝 硫酸盐侵蚀 二次腐蚀 声发射 

分 类 号：U45[建筑科学—桥梁与隧道工程]