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| Citation: | Liu Handong, Zhao Yawen, Dong Jinyu, Yang Xinglong, Jing Mao, Li Pengju, Luo Jiaming, 2022. Seismic Dynamic Response and Failure Mode of Anti-Dip Rock Slope with Weak Rock Stratum. Earth Science, 47(12): 4373-4389. doi: 10.3799/dqkx.2022.355
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Taking the Hongshiyan collapse and landslide induced by Ludian earthquake as the research object, the dynamic response and failure instability mode of anti-dip rock slope with weak rock stratum are studied through large-scale shaking table model test and 3DEC numerical simulation. The results show that under horizontal loading, the PGA amplification coefficient first decreases and then increases with the increase of frequency, and the dynamic response of the slope is the most intense under the waveform loading close to the natural frequency of 8 Hz. The weak rock stratum can amplify and absorb transverse wave of different frequencies. It has obvious amplification effect on 5—10 Hz waves, obvious absorption on 15—20 Hz waves, and absorption on 25—30 Hz waves, but not obvious in 15—20 Hz frequency. Under vertical loading, with the increase of loading sine wave frequency, the PGA amplification factor first increases, decreases at 25 Hz, and then continues to increase. When the frequency is 30 Hz, the PGA amplification factor reaches the maximum. In the range of 5—30 Hz, the weak rock stratum has a certain amplification effect on the longitudinal wave. Under two direction loadings, the horizontal and vertical PGA amplification factor distributions of the slope are consistent with that under single direction loading. However, two direction loadings, the dynamic response at some positions of the slope is intensified, while the dynamic response at some positions is restrained. The failure process of anti-dip rock slope with weak rock stratum can be divided into six stages: slight damage inside the slope body-weak rock stratum extrusion and hard rock cracking above the boundary of soft and hard rock-hard rock crack extends upward-squeezing sliding of weak rock stratum-sliding surface formed by bedding plane and vertical joints-slope failure. In the anti-dip rock slope with weak rock stratum, the weak rock stratum has the amplification and absorption of seismic waves and the refraction and reflection effect, which affects the dynamic response characteristics of the slope. The extrusion failure of weak rock stratum leads to the disintegration and rupture of the structural plane of the upper rock mass, which is the main reason for the failure and development of the rock slope. For this kind of slope, attention should be paid to strengthening the weak rock stratum to reduce the dynamic damage of the slope.
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