... through some in place and laboratory tests were performed to achieve the right decision. Thanks to and based on laboratory and in-situ rock mechanics experiments, resulting in this improved knowledge, it was to conclude that the left abutment of the dam, mainly due to existence of a weak zone which...

.... gneis. The left abutment is of variable quality and includes some highly fractured pegmatites which are not very suitable for foundation purposes. The quality of the rock which forms the foundation of the central core, is further diminished due to blasting operations immediately above the left abutment...