Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

Althought the adverse critisism have been continued that the concrete lining need or not, most tunnel engineer agree that the concrete lining needs to increase the tunnel safety. To establish the concrete lining's quality improvement method, we grasp the basic problems in lining construction process and propose the lining construction methods to increase the concrete quality. This paper presents a reason of initial crack occurrence in the large section tunnel (4 lane wide span tunnel), lining and an improved method for crack minimization in construction process. It is also verified verify that the proposed method can give qualified concrete lining by carrying out the concrete injection model test and the numerical analysis of concrete flow.