Abstract: The additive mass method is a crucial detection technique for assessing the rolling quality of rock-fill of dams. The quality of additive mass method’s detection data is directly dependent on the reasonableness of its field test parameters. To determine the optimal test parameters, field tests were conducted in the rock-fill area of the dam of Shuangjiangkou hydropower station. Test parameters, including mass block diameter, offset, and source height, were selected for the field test. Through the analysis and evaluation of the additive mass method data and intermediate results in the data acquisition process, the field optimal test parameters were determined to be a mass block diameter of 50 cm, a source height of 35 cm, and an offset of 25 cm. Consequently, a comprehensive set of field determination method for the test parameters was established.

Key words: rockfill of dam, additive mass method, test parameters, field test, Shuangjiangkou Hydropower Station