Study of Large Shaking Table Test on Evolution of Dynamic Characteristics and Formation Mechanism of Bedrock and Overburden Layer Slope with Stabilizing Piles and Anchor Cables
A seismic simulation shaking table test on bedrock and overburden layer slope retaining with stabilizing piles and anchor cables was designed and completed.The evolution mechanism of the dynamic characteristics of bedrock and deep overburden slope was systematically studied from the four aspects of the acceleration field,the overburden and bed-rock interface,the interior of overburden layer and the surface of the overburden layer.The results show that under the seismic action,the shallow local failure occurs on the edge and the transition area of the slope surface,followed by ten-sile cracking failure on the edge of the overburden layer,with continuous expansion to the depth of the slope.The shear failure on the interface between the overburden layer and the bedrock gradually expands to the locking section in front of the overburden layer.The forward extrusion of the trailing edge of the overburden layer induces the deep overall sliding of the overburden layer,until eventually the sliding body slides out from the shear outlet to form a landslide.The peak ac-celeration in the direction of air surface and vertical direction has a significant surface amplifying effect,which gradually increases with the elevation.The acceleration concentration areas appear at the turning point of the slope surface and the posterior edge of the overburden layer.When the intensity of ground motion is small,the distribution of peak acceleration amplification coefficient in the direction of air surface is approximately consistent with the geometry of the slope surface.With the increase of ground motion intensity,with the penetration of the interface between the overburden layer and the bedrock,the acceleration amplification effect in the direction of the air surface and the vertical direction shows the sym-metrical distribution law on the overburden surface.In the seismic resistant design of the retaining structure of high steep slope with bedrock and deep overburden layer,the retaining structure at the turning point of the slope surface should be strengthened and designed according to 3～4 times of the An-ping horizontal ground motion peak and 2～3 times of the An-ping the vertical ground motion peak.
bedrock and overburden layer slopeshaking table testdynamic characteristicsevolutionformation mecha-nism
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