Abstract：
This paper discusses the genesis of lining cracks in a double-arch tunnel during its construction. A qualitative analysis of the process, status, distribution and site treatment of crack damage was performed based on a site investigation, the analysis of construction process and the factors of topography and geology. In addition, this paper establishes a numerical model for analyzing the construction of the tunnel portal section with lining damage. Furthermore, it focuses on the distribution law of main stress inside of the lining structure considering the topographic conditions, parameters of the surrounding rock structure and construction procedures. Results show that the load is larger than the designed one locally due to bias load and that the geological structure is complex; the surrounding rock is loosening since the reinforcement is not adequate at the collapse area and it was disturbed often during the construction. All of these factors result in lining cracking. This paper theoretically explains the cracking mechanism and describes how it is consistent with the actual conditions.
WANG Ning-1,
Zhang-Li-Sheng-2
.Research on the Origins of Lining Cracks in Double-Arch Tunnels During Construction[J] MODERN TUNNELLING TECHNOLOGY, 2012,V49(1): 78-83
2012, Vol. 49 