A NEW APPROACH TO THE EVALUATION OF WATER-PRESSURE TEST-RESULTS OBTAINED IN BEDROCK BY THE US-BUREAU-OF-RECLAMATION METHOD

As is known, the permeability coefficient of saturated and unsaturated rock masses can be found using the Bureau of Reclamation Method, whic h uses single and double packer water-pressure test results obtained f rom drillholes. The Bureau of Reclamation Method is, however, a time-c onsuming processes. In this study, a new graphical method that does no t necessitate the procedures mentioned above is proposed for the deter mination of the coefficient of permeability. This graphical method has been prepared with the idea that the amount of water injected into th e testing section increases as the permeability of the rock mass incre ases. If the amount of average water loss in a 2-m test section is kno wn, the average permeability coefficient of this section can be found using the proposed graphical method.