波纹钢板加固盾构隧道衬砌管片抗弯性能试验研究

为提高既有隧道结构承载力及刚度，对盾构隧道衬砌管片进行波纹钢板加固，并采用足尺试验方法，对2块加固管片与1块未加固管片进行2点抗弯加载，分析加固管片的受力过程、破坏模式以及加固机制，并对其加固效果进行总体评价。试验结果表明： 1）波纹钢板加固是一种有效的加固方法，可以有效提高管片极限抗弯承载力及刚度； 2）加固后管片破坏模式为斜截面受剪破坏； 3）加固钢板与管片界面间存在较大剪切应力与径向剥离应力，应设置有效的抗剪及抗剥离构造措施。

Experimental Study of Bending Capacity of Shield Tunnel Lining Segment Strengthened by Corrugated Steel

In order to improve the bearing capacity and stiffness of shield tunnel lining segment, corrugated steel is used to strengthen the shield lining segment. In this paper, full scale tests are conducted on two segments strengthened by corrugated steel and one segment without strengthening to study the loading progress, failure mode and strengthening mechanism and evaluate the strengthening effect. The test results show that: (1) The corrugated steel is an effective strengthening material which can effectively improve the ultimate bending capacity and stiffness. (2) The failure mode of the strengthened segment is shear failure. (3) Shear stress and radial peeling stress exist on the interface between corrugated steel and segment concrete, and it is necessary to carry out effective countermeasures.