层状复合岩体边坡动力特性及地震响应特性的振动台试验研究

doi:10.13722/j.cnki.jrme.2020.0772

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Abstract A layered complex rock slope always consists of complex lithology and rock structure，and its seismic responses and landslide formation mechanisms are not completely understood. In the present study，a small-scale shaking table test was carried out on a layered complex rock slope model，taking a typical landslide triggered by the 2008“5·12”Wenchuan earthquake as the prototype slope，simulating the original topography and rock strata and using the accelerations recorded at the seismic station adjacent to the landslide area as input waves. Based on the sensor measurements，the natural frequencies and acceleration responses of the model slope were analyzed，and the horizontal and vertical responses were compared. In addition，the acceleration and displacement responses of the weak layer in the model slope，namely carbonaceous slate，were analyzed to emphasize the role of the layer in the whole slope¢s responses. The main results show that the model slope demonstrates different vibration modes under horizontal and vertical excitations，and the natural frequencies for both directions undergo three-phase decreasing process which indicates a gradual deterioration of the slope structure. The topographic amplification effect of the vertical acceleration of the model slope is weaker than that of the horizontal acceleration. However，the model slope shows a more significant modification effect on the vertical input waves，and the carbonaceous slate plays a weakening effect of the vertical acceleration. Bulging deformation was observed on the surface of the carbonaceous slate under a high level of excitation. At the stage of the destructive test，the peak horizontal displacement in the carbonaceous slate is larger than that in the overlying phyllite slate. However，the incompatible deformation among different strata does not cause the model slope to slide along the carbonaceous slate，which is inconsistent with the actual location of the sliding surface of the prototype landslide. Nonetheless，the above results，especially the differential responses between the horizontal and vertical accelerations and between different strata，can still help to explain the failure mechanism of a layered complex rock slope triggered by an earthquake.

Key words： slope engineering layered complex rock slope shaking table test dynamic property acceleration response displacement response

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	LIU Hanxiang
	ZHOU Yifei
	LI Xin

Cite this article:

LIU Hanxiang,ZHOU Yifei,LI Xin. Shaking table test of dynamic responses of a layered complex rock slope under earthquake[J]. , 2021, 40(4): 676-689.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0772 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I4/676

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