The impact of rolling stone on roof of shed tunnel can be effectively reduced by covering a layer of sand cushion on shed structure roof. In the past, the finite element method was used to do this study, but discrete characteristics of sand cushion could not be considered, so the study method needed to be improved. Here, taking shed tunnel cushion’s physical model test as the prototype, considering the dispersion of sand particles and the continuity of shed tunnel concrete structure, the discrete element-finite difference coupled algorithm was adopted. The discrete element model was used to simulate sand cushion, and the finite difference method was used to simulate shed tunnel concrete structure. With advantages of the two simulation methods, the dynamic response of shed tunnel cushion under impact of rolling stones with different angles and velocities was numerically simulated. Through analyzing bearing reaction force of the impacted shed tunnel, its roof displacement and rolling stone impact force, dynamic response characteristics of the shed tunnel structure were revealed. The results showed that rolling stone’s impact angle and impact velocity affect significantly bearing reaction, with increase in impact angle, bearing reaction increases; under the condition of smaller impact angle, bearing reaction is more affected by impact angle, while under the condition of larger impact angle, impact velocity affects bearing reaction more obviously; with increase in impact angle and impact velocity, impact force of rolling stone increases, under the condition of larger impact angle, increase in impact angle has more obvious action to lift impact force; vertical displacement value at roof center of shed tunnel increases significantly with increase in impact angle and impact velocity; under smaller impact angle, impact angle has larger influence on roof displacement, while under larger impact angle, effects of impact velocity on roof displacement are more significant.
Key words
rolling stone /
shed tunnel /
impact angle /
discrete element-finite difference coupling
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