中东铁路交通软岩隧道衬砌裂损机制试验研究

EXPERIMENTAL STUDY ON LINING CRACKING MECHANISM OF SAUDI HIGHWAY TRAFFIC SOFT ROCK TUNNEL

随着山岭隧道运营数量的增多,衬砌逐渐暴露出系列病害,其中偏压导致衬砌裂损是主要的一种。以沙特公路交通隧道为研究背景,通过偏压荷载引起隧道衬砌裂损机制及FRP网格加固的相似比尺试验,可得以下结果:偏压作用下产生的裂缝为张拉型裂缝,外观主要表现为张开;同样工况条件下,隧道衬砌结构随着偏压范围的增大而承载力在降低,并且隧道衬砌结构的承载力随着FRP网格加固范围的增大而显著提高。隧道衬砌结构的承载力随着FRP网格加固层数量的增加而得到明显提高;相同FRP网格加固条件下,隧道衬砌结构偏压范围的增大对FRP网格的加固效果有很大的削弱影响。

With the increase of the number of mountain tunnel operations,the lining has gradually exposed a series of diseases,of which the lining crack caused by bias pressure is the main one.Taking the Saudi highway traffic tunnel as the research background,the following results can be obtained through the similar scale test of the tunnel lining crack mechanism caused by the bias load and the FRP grid reinforcement.The cracks generated under the bias load are tensile cracks,and the appearance is mainly open.Under the same working condition,the bearing capacity of the tunnel lining structure decreases with the increase of the bias pressure range,and the bearing capacity of the tunnel lining structure increases significantly with the increase of the FRP grid reinforcement range.The bearing capacity of the tunnel lining structure is obviously improved with the increase of the number of FRP mesh reinforcement layers.Under the same FRP grid reinforcement conditions,the increase of the tunnel lining structure bias range has a great weakening effect on the FRP grid reinforcement.