Geology Related Construction Problems at the Urugua-i Hydroelectric Projectby J. P. Sollo, Bechtel Civil, Inc, United States,
Abstract: The Urugua-i Hydroelectric Project in north-eastern Argentina consists of an 80 m high roller-compacted concrete dam, 4.4 km long lateral dike, 800 m long power tunnel, and a 120 MW powerhouse. An extensive consolidation grouting program with a foundation drainage system was designed to increase foundation stability. In addition, a shear-key was incorporated to improve the resistance to sliding. Along the lateral dike, a large fault zone was encountered in which the dike foundation rock was found to be 17 m below the design level. The 7.6 m diameter power tunnel was driven with only minor support except at the zone where a one-meter-thick shear zone was encountered. This seam was removed by ramping up and overexcavating the crown for about 35 m. Rock support and reinforcement, and consolidation grouting were performed.
Subject Headings: Power plants | Hydro power | Construction management | Foundation design | Geology | Tunnels | Grouting | Levees and dikes | Consolidated soils | Foundation settlement | Argentina | South America
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