脱空混凝土管道纵向力学行为及自膨胀高聚物注浆修复性能提升  

LONGITUDINAL MECHANICAL BEHAVIOR OF VOID CONCRETE PIPES AND RESILIENCE IMPROVEMENT OF SELF-EXPANDING POLYMER GROUTING REHABILITATION

作　　者：李斌[1,2,3] 方宏远 杜雪明[1,2,3] 孙明明 薛冰寒 LI Bin;FANG Hong-yuan;DU Xue-ming;SUN Ming-ming;XUE Bing-han(Yellow River Laboratory,Zhengzhou University,Zhengzhou 450001,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,China;Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety,Zhengzhou 450001,China;School of Hydraulic and Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]黄河实验室(郑州大学),郑州450001 [2]重大基础设施检测修复技术国家地方联合工程实验室,郑州450001 [3]水利与交通基础设施安全防护河南省协同创新中心,郑州450001 [4]郑州大学水利与土木工程学院,郑州450001

出　　处：《工程力学》2024年第11期134-144,共11页Engineering Mechanics

基　　金：国家重点研发计划项目(2022YFC3801000);国家自然科学基金项目(52208375,51978630);中国博士后科学基金项目(2022TQ0305,2022M722884);河南省青年人才托举工程项目(2023HYTP016);河南省重点研发与推广专项项目(科技攻关)(232102321073)。

摘　　要：为揭示脱空混凝土管道的纵向力学行为以及自膨胀高聚物外部注浆修复性能提升效果,开展了密实、脱空和高聚物修复混凝土管道现场足尺试验和三维有限元数值仿真,并通过试验结果对数值模型进行了验证。以不同管基状态下混凝土管道的截面纵向弯曲弯矩和管顶竖向位移为分析对象,讨论了脱空宽度和脱空长度对混凝土管道力学行为的影响规律,并引入纵向弯矩和竖向位移修复指数ξM和ξU,对高聚物注浆修复脱空管道的性能提升效果进行了量化表征。研究表明:脱空管道正负纵向弯矩分别分布在脱空两侧的相邻管段和接头,峰值分别位于SgL2、SgR2和SgL3、SgR3处;脱空管道纵向弯矩在SgL1和SgR1处随脱空宽度的增大而减小,其余测点处随脱空宽度的增大而增大,在整个纵向随脱空长度的增大而增大;不同脱空宽度和脱空长度管道的纵向弯矩在SgL1和SgR1以外均高于密实管道;与密实管道相比,脱空管道竖向位移和接头剪切位移的最大增幅分别为155%和230%;修复管道的纵向弯矩略低于密实管道,竖向位移略高于密实管道,纵向弯矩和竖向位移最大修复指数分别为76.5%和83.7%。To reveal the longitudinal mechanical behavior of void concrete pipes and the resilience improvement of self-expanding polymer external grouting,three full-scale tests and 3D finite element numerical simulations of dense,void,and polymer-repaired concrete pipes were performed,and the numerical models were verified by the test results.Selecting the longitudinal bending moment of the pipe section and the vertical displacement of the crown under different bedding conditions as analysis objects,the impacts of void length and void width on the mechanical behavior of concrete pipes were discussed,and theξM andξU referring to the longitudinal bending moment and vertical displacement repair indices were introduced to quantitatively characterize the resilience improvement effect of the repaired pipes.The results show that the positive and negative longitudinal bending moments of the void pipes are distributed in the adjacent pipe sections and joints on both sides of the void,and the peaks are located at SgL2,SgR2 and SgL3,SgR3,respectively.The longitudinal moments of void pipes decrease with the increasing void width at SgL1 and SgR1,increase with the increasing void width at remaining measuring points,and increase with the increasing void length in the whole longitudinal length.The longitudinal moments of pipes with different void widths and void lengths are higher than those of the dense pipes except for SgL1 and SgR1.Compared with the dense pipes,the maximum increases in vertical displacement and joint shear displacement of the void pipes are 155%and 230%,respectively;the longitudinal bending moments of the repaired pipes are slightly lower and the vertical displacements are slightly higher than those of the dense pipes,and the maximum repair indices of longitudinal bending moments and vertical displacements are 76.5%and 83.7%.

关 键 词：脱空管道 注浆修复 足尺试验 有限元模型 力学行为 性能提升 

分 类 号：TU990.3[建筑科学—市政工程]