隧道钢筋混凝土衬砌开裂后的刚度退化解析  

Analytical study on stiffness degradation of reinforced concrete lining in tunnel

作　　者：何文正 徐林生[1] HE Wenzheng;XU Linsheng(School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;School of Urban Construction Engineering, Chongqing Radio & Television University, Chongqing 401520, China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆广播电视大学城市建设工程学院,重庆401520

出　　处：《中国科技论文》2020年第12期1435-1440,共6页China Sciencepaper

基　　金：重庆市教育委员会科学技术研究项目(KJQN201904004);重庆交通大学山区公路水运交通地质减灾重庆市高校市级重点实验室开放基金资助项目(kfxm2018-08)。

摘　　要：为了揭示钢筋混凝土衬砌开裂后截面刚度退化规律,提出了一种钢筋混凝土衬砌开裂后的刚度退化解析计算方法。根据实测的钢筋混凝土衬砌裂缝统计特征参数,建立了裂缝区底部混凝土的名义拉应变表达式,运用解析刚度法推导了基于裂缝特征参数的钢筋混凝土衬砌损伤刚度计算公式。通过工程实例分析,详细讨论了裂缝间距和宽度对衬砌刚度的影响,分析了衬砌开裂后的内力分布规律。研究结果表明:裂缝宽度和间距对钢筋混凝土衬砌结构刚度影响非常显著。该研究成果可为钢筋混凝土衬砌结构的安全性评价提供一定的参考。In order to study the law of stiffness degradation of reinforced concrete lining after cracking,a novel method is proposed in this study to accurately evaluate the stiffness degradation of cracked reinforced concrete lining.According to the statistical characteristics of bending cracks of the lining structure,the expression of nominal tensile strain of concrete at the bottom of the fracture zone was established,and the stiffness calculation formula of reinforced concrete lining was deduced by analytical stiffness method.A case study was conducted to analyze the stiffness degradation and the distribution of internal forces after lining cracking obtained using the proposed method.Results demonstrate that the crack width and spacing have significant influence on the stiffness of reinforced concrete lining.This study serves as a reference for the safety evaluation of reinforced concrete lining structure.

关 键 词：衬砌 裂缝 刚度退化 评价 

分 类 号：U451[建筑科学—桥梁与隧道工程]