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List of products by author: G. Anagnostou
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Effectiveness of advance drainage boreholes for the face stability of subaqueous tunnels crossing highly...
Abstract: Subaqueous tunnels close to the seabed but far below sea level are characterized by very high hydraulic gradients, which in combination with weak ground may endanger face stability. Advance drainage improves stability (Zingg and Anagnostou, 2016), but becomes less effective in the presence of casings or where the water inflow volumes are so high that pipe flow develops within the boreholes....
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Failure modes of the steel lining of underground reservoirs for compressed air energy storage (CAES)
Abstract: Compressed air energy storage (CAES) in caverns, shafts or tunnels makes use of the high resistance of the surrounding rock mass to the gas pressure. A lined rock cavern (LRC) is the most attractive concept. The gas pressure is borne by the rock, while the tightness of the system is guaranteed by a composite lining consisting of an inner thin steel shell and an outer reinforced concrete shell....
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Investigation into the Stabilizing Effect of Pipe Umbrellas
Abstract: One of the main hazard scenarios in tunnelling is ground instability in the excavation area, i.e. a collapse of the tunnel face and/or of the tunnel crown and walls over the unsupported span immediately after or during the excavation round. Pipe umbrellas are often applied to mitigate these risks of instability and thus to increase safety during construction. However, the increase in face...
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Key design issues of lined tunnels and shafts used for compressed air energy storage
Abstract: Energy storage is of growing importance due the increasing exploitation of renewable energy sources of an intermittent nature. Compressed air energy storage (CAES) plants represent an alternative to pumped-storage reservoirs for storing large quantities of energy. The peculiarity of CAES is that gas must be stored under a high pressure (up to 30 MPa) in order to achieve the necessary...
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Swelling Control in Tunnelling by Heating
Abstract: As illustrated by a number of tunnels, swelling of anhydritic claystones results in relevant deformations of the tunnel cross section, development of high pressures on (and damage to) the tunnel lining or, in the case of a small - moderate depths of covers, even heave of the entire lining and of the overlying ground up to the surface. This paper presents a conceptual study for a swelling...
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Tunnelling induced settlements in saturated soils under partially drained conditions
Abstract: The present paper investigates the effect of the consolidation process on surface settlements developing during on-going tunnel advance or during standstills in water bearing ground. Comparative coupled hydro-mechanical analyses of 3D tunnel models have been performed for the paper. The results illustrate how surface settlements are affected by the advance rate, lining permeability and (for...
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