摘要
以北京地铁某线路复合衬砌结构裂缝病害为研究背景,采用室内模型试验方法开展对衬砌结构破坏规律和补强效果的研究。通过试验得出主要结论如下:(1)试验梁裂缝发展分为4个阶段,以试验荷载90 kN、120 kN、180 kN和350 kN为分界点。(2)芳纶纤维布补强试验梁的破坏试验显示,黏贴在试验梁下部的芳纶纤维布提升了试验梁的抗弯性能,其挠度由13 cm增加至18 cm; 3 m的补强范围保证了试验梁在破坏时,芳纶纤维布的两边始终粘贴在试验梁下部,未出现拱顶掉块和直梁实验中常见的纤维布断裂破坏形式。(3)通过对比试验可以得出,芳纶纤维布补强不同损伤程度的试验梁可使其屈服荷载提高17%～39%,极限荷载提高46%～71%,对试验梁承载力提高明显。本文的研究结论对下一阶段的隧道衬砌结构裂缝病害综合治理工作具有重要的理论指导意义。
Taking composite lining diseases of a Beijing subway line as research background,indoor model test method was used to studying lining structure damage rule and reinforcing effect. Through experiment,it was concluded the main conclusions as follows: ( 1) the crack propagation of test beam could be divided into four stages by test load demarcation point,which were 90 kN,120 kN,180 kN and 350 kN. ( 2) The damage test of aramid fiber cloth on reinforcing test beam showed that,the aramid fiber cloth paste on test beam bottom has improved the test beam bending performance,and the deflection increased from 13 cm to 18 cm. When the test beam damaged,the two side of 3 m long aramid fiber cloth always pasted on beam bottom,and never appeared chip off-falling and fiber cloth fracture damage forms,which was a common phenomenon on straight beam test. ( 3) Through the contrast test,when the aramid fiber cloth using different injured test beam,the yield load of test beams could increase by 17% ~ 39%, the ultimate load of test beams could increase by 46%~ 71%,all the bearing capacity of test beams were obviously increased. The research conclusions have important theoretical guiding significance for the comprehensive treatment work on the tunnel lining structure cracks during the next phase.
作者
李宇杰
徐会杰
王梦恕
宋国侠
Li Yujie;Xu Huijie;Wang Mengshu;Song Guoxia(Beijing Mass Transit Railway Operation Co. Ltd,Beijing 100044,P.R.China;School of Civil Engineering, Beijing Jiaotong University,Beijing 100044,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2018年第6期1512-1518,共7页
Chinese Journal of Underground Space and Engineering
基金
国家重点研发计划课题(2016YFB1200402)
关键词
复合衬砌
芳纶纤维布
补强
模型试验
composite lining
aramid fiber cloth
reinforcing
model test
