Abstract
A numerical analysis model of layered rock slope with small spacing tunnel was established with MIDAS GTS/NX finite element program, and the validity of numerical simulation was validated with a large-scale shaking table experiment. On this basis, the dynamic stability of the model slope and the influence of ground motion parameters on the seismic dynamic responses were analyzed. The results show that the maximum horizontal displacement occurs at the top of the slope. The existence of the tunnel markedly changes the stress distribution inside the slope. The tensile failure and shear failure may appear at the middle wall, at the foot of the slope and at the conjugate 45° direction of the surrounding rock of tunnel. The seismic failure of the slope is the dynamic development process with the increase of excitation time and the slope is more likely to be damaged under coupled earthquake. The peak ground acceleration (PGA) amplification coefficients along the slope surface decrease with the increase of earthquake amplitudes under coupled earthquake, but they increase with the increase of amplitudes under horizontal earthquake. The PGA amplification coefficients along slope surface decrease with the increase of earthquake frequencies. The duration has little influence on the PGA amplification effect.
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