| In this study、 in order to gain a basic knowledge for establishing a performance-based impact-resistant design procedure for reinforced concrete (RC) rockfall protection galleries、 consecutive falling-weight impact tests of a large-scale gallery covered with a 90 cm thick sand cushion were conducted、 in which a 10 tonne weight was used to input the impact energy. In this test、 the impact response behavior of the gallery model in the elastic to plastic regions was investigated by increasing the falling height of the weight from 1 m up to 25 m. From this study、 the following results were obtained ; the maximum impact force can be better evaluated using Hertz’s contact theory with Lame’s constant λ = 1、000kN/㎡; and 2) considering an amplification factor due to the effect of aspect ratio of the diameter of the falling weight to the depth of sand cushion; and 3) the roof slab may reach the ultimate state in the flexural failure mode. |
