Numerical simulation for rock-fall impacting an arch RC hangar tunnel based on SPH-FEM coupled method

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (13) : 118-125.

LIU Chun1, YU Zhixiang1,2, GUO Liping1, LUO Liru1, ZHAO Shichun1,2

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Abstract

Compared with frame reinforced concrete (RC) hangar tunnels, arch RC ones have advantages of small self-weight and large span, and sand cushion is commonly used by the latter to dissipate impact energy. Aiming at the existing difficulty of using FEM to simulate arch hangar tunnel’s sand materials with super-large deformation, the smooth particle hydrodynamics-finite element method (SPH-FEM) coupled method was proposed. SPH particles were used to simulate large deformation sand cushion in rock-fall impact area to improve computation efficiency and accuracy, finite elements were used to simulate sand cushion in non-impact area. Concrete, reinforcement, rock and ram hammers, etc. were divided into Lagrange standard finite element meshes. Based on the SPH-FEM coupled method, the numerical model for rock-fall impacting an arch RC hangar tunnel was established. The numerical simulation results showed that with increase in impact energy, impact force peak and displacement peak at arch middle point gradually increase; compared with full-scale impact test results, maximum errors of impact force peak and displacement peak at arch middle point are less than 10%, so the correctness of the numerical coupled model is verified; the numerical coupled model vividly reproduces a physical process of sand pit-forming, sand cushion’s energy-dissipating occupies more than 85% of initial impact kinetic energy, so sand cushion is a very good material for buffering and energy-dissipating; the SPH-FEM coupled method is aneffective means to simulate rock-fall impacting arch RC hangar tunnels.

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coupled SPH-FEM method / rockfall impact / reinforced concrete arch shelter / full-scale impact test / numerical simulation

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LIU Chun1, YU Zhixiang1,2, GUO Liping1, LUO Liru1, ZHAO Shichun1,2. Numerical simulation for rock-fall impacting an arch RC hangar tunnel based on SPH-FEM coupled method[J]. Journal of Vibration and Shock, 2019, 38(13): 118-125

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