The Evaluation of the Quality of the Grout Curtain of Salman Farsi Dam through the Secondary Permeability Index (SPI)

Salman Farsi is located in 180 kilometers of the southeast of Shiraz on the Ghareh-Agai River with the arch-gravity concrete dam of 125m height from the foundation. The grout curtain is situated entirely within the karstic limestone environment in the Asmari formation. To evaluate the quality of the curtain after grouting operation, some boreholes were drilled and water pressure tests were performed on them. In this research, according to the results of water pressure tests on the controlled boreholes, the secondary permeability index was calculated and through the classification of the rock masses, their quality were determined after the grouting operation. Results indicate that although the right bank of grout curtain has better quality than the left bank, however the quality of the grout curtain has been in the range of good to excellent.