复合腔体加固盾构隧道纵缝接头试验研究

Experimental study on the longitudinal joint of shield tunnels reinforced with composite cavity

从现有运营盾构隧道的服役状况来看,大变形区间隧道管片接头的张角变形通常会超出设计要求,必须进行及时加固以控制变形。复合腔体作为一种新型加固材料具有轻型和快速加固的特点,能较好的应用于运营地铁隧道的快速加固。以复合腔体加固纵缝接头为试验对象,采用足尺试验方法对加固及未加固的纵缝接头的受力性能及其破坏形态分别进行比较,得到复合腔体加固接头的破坏机理,并对其加固效果进行总体评价。

According to the conditions of shield tunnel operation, the open - angle of the joint often exceeds the design requirements in the ling rings with large deformation, which should be reinforced in time to control the deformation. As a new reinforcement material, composite cavity has the characteristics of light- weight and rapid reinforcement, which can be quickly applied to metro tunnels. A full - scale test was carried out to study the ul- timate bearing capacity of the reinforced longitudinal joint and that of the unreinforced. The failure mechanism of reinforced joints with composite cavity was obtained and the overall effect of the reinforcement was evaluated. The results obtained are in well accordance with the previous findings and can provide reference value to similar engineering projects.