In order to investigate the anomalously low friction effect and the mechanism of opening slide of slope with structural plane under earthquake

the slope with single structural plane was simplified to equivalent mass-viscoelasticity model.Combined theoretical analysis with numerical simulation

the normal stress state of structure plane and the relative normal velocity and normal displacement of fundamental rock and landslide was taken as a research object

the evolution law of normal stress state of structural plane and the relative normal velocity and displacement between fundamental rock and landslide under seismic load were obtained.The essence of anomalously low friction effect in the system of slope including single structural plane was revealed.The results of theoretical analysis and numerical simulation show that the fluctuation of the seismic load leads to the negative and positive alternating of relative normal displacement between fundamental rock and landslide

the increase and decrease of normal dynamic stress occur alternately

when the normal dynamic stress is positive and the anomalous low friction phenomenon occurs in the dynamic system

and the slope will deform with progressive failure.