Grouting and Ground Treatment: Proceedings of the Third International Conference, (ASCE)
Curtain Grouting for the Antamina Dam, Peru Part 2 – Implementation and Field Modifications
D.G. Ritchie, J. P. Garcia, F. Amaya, M.G. Jefferies
Curtain grouting for the Antamina Dam in the Peruvian Andes involved nearly 40,000 m of drilling and injection of 2,800 tons of cement. The curtain is 780 m long and as much as 95 m deep. This paper, the second of two, addresses execution of the grouting including required design modifications. Paper 1 (Carter et al., 2003) presents the design and achieved performance of the grout during reservoir impoundment. Grouting was specified using the GIN system. However, this led to formation damage and little reduction in the hydraulic conductivity of the rock. Following detailed analysis of the ground response to grout, using electronically acquired pressure/flow data, grouting procedures were revised to blend the rest of the GIN approach with the key components of the Australian Method. Routine water pressure test verified curtain closure. Final conductivities were less than 1.5 Lugeons (including the karst region), with many zones 0.01 Lugeons.
|article #1132; publication #62 (GRT-2003)|