Assessment of Engineering Geology and Grouting Applications in Yalnızardıç Dam Site (Antalya, Turkey)

Abstract

The Yalnızardıç RCC dam constructed in 2015 is located in the Mediterranean region of Turkey, and it is intended for electric power production. The dam is approximately 303 m long and 92 m height. In this paper, the geotechnical properties of Yalnızardıç Dam's foundation and the grouting methods used to improve this foundation were examined to determine its performance for grouting. Engineering geological mapping, drilling, laboratory tests, and water pressure tests were undertaken to specify the foundation properties. In a consequence of tests, high-permeable and permeable zones were identified in the dam axis area. Grout curtain, including two rows of grouting holes, were built in the left abutment, thalweg and right abutment in accordance with the Lugeon tests and RQD results. Also, blanket (consolidation) grouts were built all foundation areas. Check boreholes along the foundation were opened after grouting treatment and Lugeon tests were performed. The results from the check boreholes indicated that average Lugeon (LU) values reduced, and the values were within the recommended limit. The process shows considerable accuracy in evaluating grouting efficiency.