Experiment on dynamic stability of ballasted filling slope

To study on the dynamical stability of filling soil slope ballasted by concrete slab is not only the way to know the dynamic mechanism of the slope damage caused by seismic wave, but the demand of design and treatment of the filling soil slope ballasted by concrete slabs scientifically. By indoor model experiments, the stability and the failure mode of ballasted filling soil slope under simulating seismic wave condition have been researched. Some results have been worked out and list as follows: 1) when the strength of the concrete slab is high enough, in the process of vibration acceleration increasing, the inner structure of soil in filling soil slope changes and a structure interface appears. Upper side of the interface, the density of soil descends and the soil become loosens. Lower side of the interface, the density of soil ascends and the void ratio declines. Because of the loosening in upper side soil, the concrete slab can press back the soil and make the angle of slope smaller. The whole density of the filling soil slope increases and the slope would be more stable. 2) When the strength of the concrete slab is not high enough, in the process of vibration acceleration increasing, a shear crack will appears about in the middle of the concrete slab on the filling soil slope and then a landslide will shear out from the crack. The interface of the landslide is almost the same as the 0 change interface of density (structure interface). 3) Vibration will damage filling soil slope by causing concentrated shear stress on an interface of soil structure. This kind of shear stress can make some kind of concrete slab fracture. These results can be basis for constructing failure mode of filling soil slope under seismic shake condition.