Experimental Study on the Properties of Mixed-Fiber Concrete Shield Tunnel Segments Subjected to High Temperatures

In order to study the mechanical and damage behavior of concrete shield tunnel segments under a high temperature, two self-compacting three mixed-fiber (steel polypropylene fiber) test blocks were designed. The influence several key factors, including fire duration, pre-loading, type, on studied. results show that type fiber pre-loading have an important crack development in segments. Compared with undoped segments, cracks steel fibers appeared later, average spacing decreased. has effect vertical deformation before after temperature rise. As load level increases, so does initial should be considered when designing resistance segment.