State-Oriented Maintenance Strategy for Deteriorating Segmental Lining of Tunnel

Abstract

The lining of tunnel is the principal part in ensuring its usage for transportation or utilities. Maintenance during operation is the way to keep structure in the state of high performance. To consider the efficiency of maintenance within limited resources (maintenance cost), state-oriented maintenance (SOM) approach is proposed. The SOM approach takes service state of the tunnel lining as a levelled target which should be maintained by different degrees of repairing measures. The evolution of service state of tunnel lining is modelled as a non-stationary Gamma process in this investigation, as this process can characteristic the variations of degradation rates. Two cases of numerical analysis with SOM approach give their lifetime maintenance costs. Case one (MS-1) sets SOM strategy with two-levelled service state. The other case (MS-2) adopts SOM strategy with multi-levelled service state. The numerical results demonstrate that the later one would reduce maintenance cost during the whole service life of tunnel lining.

Towards Automated Inspections of Tunnels: A Review of Optical Inspections and Autonomous Assessment of Concrete Tunnel Linings

“…In its essence, damage diagnostics and the subsequent planning of required maintenance is an optimization problem that must find a sufficient balance between the cost of maintenance and the required level of safety of the tunnel. Different strategies to optimize maintenance are presented in the literature, see, e.g., Ai and Yuan [ 76 ], Baji et al [ 77 ], and Zuluaga and Sánches-Silva [ 78 ]. Regardless of the methodology used, the problem is determining suitable threshold values for the observed damage to decide if any countermeasures need to be taken or if the damaged section does not impact the structural stability or safety and can be ignored.…”

Rapid Acquisition and Identification of Structural Defects of Metro Tunnel

“…Accidents caused by untimely inspection have recently attracted the attention of researchers, owners and administrations [1,2,3,4,5]. It has been widely recognized that the structural defects of metro structures (mainly tunnels) should be frequently inspected, in order to avoid the risk of disruption due to late intervention [6,7,8,9,10,11,12,13]. However, the time required for inspection leads to the unavailability of transport infrastructures.…”

Experimental Study on Vertical Shear Behaviors of an Immersion Joint with Steel Shear Keys

“…Since the first immersed tunnel was constructed in the USA in 1894, the technology of the immersed tunnel has developed quickly and spread around the world for over a century [1]. As a type of tunnel constructed by prefabricated components, the immersion joints connecting contiguous elements are the weakest [2][3][4]. Of the mechanical properties of an immersion joint, the shear behavior is a significant factor when subjected to differential settlements [5][6][7], earthquakes [8,9], wave impacts [10], etc.…”