关键词: 滑坡, 锚固系统, 地震作用, 动力响应, 振动台试验

Abstract: In order to study the dynamic responses of anchorage system under earthquake，the model of landslide supported by anchor bars and lattice beam is carried out using shaking table. The difference of dynamic response of anchor bars in different locations and the mechanism behavior of anchor bars under earthquake are studied by inputting waves of Wenchuan earthquake, EL Centro earthquake and sine seismic wave to monitor the axial force of anchor bars, landslide acceleration and landslide displacement. The results suggest that under low level earthquake loading (0.05 g～0.40 g), the surface effect of slope toe is more obvious than other parts of the landslide, and the sliding surface near slope toe is prone to fracturing because of repeated rubbing and cutting. Based on pseudo-static method design, it is advised that short anchors or soil nails should be driven into toe slope in order to balance the uncoordinated reciprocating motion of sliding surface near slope. Under high level earthquake loading (0.6 g～0.8 g), the surface effect of slope shoulder is more obvious, the fracture in sliding surface near slope top is longer and wider than before, and the sliding surface is more likely to crack or collapse. It is advised that the first-row anchors should be extended in order to restrain the development of cracks in slope sliding surface. Meanwhile, using short anchors or growing plants with developed root system at top of the slope is necessary to protect the slope. Slope with anchorage system is not prone to as-a-whole slope damage like plain soil slope, and under high level earthquake loading, firstly anchors in slope toe are damaged, and then tensile force of top anchors sharply rises due to cracks caused by pulling force at the top surface of slope. The results provide a reasonable foundation for the design of anchor bars under earthquake.

Key words: landslide, anchorage system, earthquake, dynamic response, shaking table test