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Abstract The engineering design for concrete-lining tunnels should focus on the investigation and utilization of the surrounding rock geotechnical conditions governed by topography and in-situ stress state，as well as the permeability of rock mass under high water pressure，etc.. Some critical design criteria applied to the design of concrete-lining high pressure hydropower tunnels are discussed，such as the minimum overburden criterion，hydraulic fracturing criterion and minor principal stress criterion，and their application conditions and relations are also discussed. As an illustration，the application of the above criteria to the design of Tianhuangping Pumped Storage Power Station is introduced. Field test method and results of high pressure permeability tests carried out at Tianhuangping pumped storage power station are discussed. At last，the engineering treatments for some locations with comparatively low in-situ stress mainly caused by joint structure are presented.
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Received: 18 December 2008
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