Author(s)

Arash Rostami¹, Parham Kamali Dehkordi², Morteza Askari Ziarati¹, Saman Jahani³, Kamran Lotfi⁴

¹Department of Civil Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
²Isfihan University, Isfihan, Iran.
³Department of Civil Engineering, UAE Branch, Islamic Azad University, Dubai, Dubai.
⁴Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran.

During tunneling in loose grounds, the ground deformation caused by drillings around the tunnel, leads to land subsidence and the adjacent tunnel which would affect tunnel structure and surrounding structures. In such situations it is necessary to improve the properties of the ground prior to drilling operations. In order to acquire tunnel face stability during excavation operations in areas with loose soil fault or areas with lack of adhesion, there are various methods such as split cross drilling, frame holder or auxiliary pre-holding methods such as umbrella arch method; pre-holding methods must provide safety when drilling and must be affordable, economically. In this study, we assessed the previous studies on methods and behaviors of umbrella arch strategy in reinforcing the concrete tunnels, reached the purpose with experimental and numerical methods and offered the latest design achievements, implementation progresses and analysis in relation with this method.

Tunnel, Drilling, Umbrella Arch Method, Forepole, Arming

Rostami, A. , Dehkordi, P. , Ziarati, M. , Jahani, S. and Lotfi, K. (2016) The Types of Tunnels Maintenance in Umbrella Arch Method. Open Journal of Civil Engineering, 6, 156-162. doi: 10.4236/ojce.2016.62014.