{"title":"Hydrogeological Risk and Mining Tunnels: the Fontane-Rodoretto Mine Turin (Italy)","authors":"Paola Gattinoni, Laura Scesi, Elena Cerino Adbin, Daniele Cremonesi","volume":73,"journal":"International Journal of Structural and Construction Engineering","pagesStart":8,"pagesEnd":13,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/12177","abstract":"The interaction of tunneling or mining with\r\ngroundwater has become a very relevant problem not only due to the\r\nneed to guarantee the safety of workers and to assure the efficiency of\r\nthe tunnel drainage systems, but also to safeguard water resources\r\nfrom impoverishment and pollution risk. Therefore it is very\r\nimportant to forecast the drainage processes (i.e., the evaluation of\r\ndrained discharge and drawdown caused by the excavation). The aim\r\nof this study was to know better the system and to quantify the flow\r\ndrained from the Fontane mines, located in Val Germanasca (Turin,\r\nItaly). This allowed to understand the hydrogeological local changes\r\nin time. The work has therefore been structured as follows: the\r\nreconstruction of the conceptual model with the geological,\r\nhydrogeological and geological-structural study; the calculation of\r\nthe tunnel inflows (through the use of structural methods) and the\r\ncomparison with the measured flow rates; the water balance at the\r\nbasin scale. In this way it was possible to understand what are the\r\nrelationships between rainfall, groundwater level variations and the\r\neffect of the presence of tunnels as a means of draining water.\r\nSubsequently, it the effects produced by the excavation of the mining\r\ntunnels was quantified, through numerical modeling. In particular,\r\nthe modeling made it possible to observe the drawdown variation as a\r\nfunction of number, excavation depth and different mines linings.","references":"[1] A. Dematteis, G. Kalamaras, A. Eusebio, \"A systems approach for\r\nevaluating springs drawdown due to tunneling\", in \"World Tunnel\r\nCongress AITES-ITA\" Vol. 1, Patron, pp 257- 264, 2001.\r\n[2] S. Loew, \"Groundwater hydraulics and environmental impacts of\r\ntunnels in crystalline rocks\", in \"Meccanica e Ingegneria delle rocce -\r\nMIR\", Torino, Italy, pp 201-217, 2002.\r\n[3] L. Scesi, P. Gattinoni, Water Circulation in Rocks, Springer, 2009, p.\r\n165.\r\n[4] A.W. Harbaugh, E.R. Banta, M.C. Hill, M.G. McDonald, The U.S.\r\nGeological Survey modular ground-water model - User guide to\r\nmodularization concepts and the groundwater flow process, Open-file\r\nReport 00-92, USGS, Boulder, Co, 121p., 2000.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 73, 2013"}