The Large-scale Shaking Table Test Study Of Dynamic Deformation Characteristics And Response Of Slope With Anti-dip Weak Interlayer

The earthquake is an important factor to cause the deformation, stability as well as damage of the slope, and the specific characteristic of the weak layer for the slope is of significant to the stability of the slope. In order to make research on the dynamic deformation characteristics and response of slope with anti-dip weak interlayer under earthquakes, this passage puts a simple model with an anti-dip weak interlayer based on past experiments of other researchers. With the help of the large-scale shaking table model test and observation as well as recording of the deformation during the experiment, we collect the data for the different observation point to make illustration and give a summary of the characteristic of the slope deformation. After the experiment, we get the results as following.(1) There is a relationship between the deformation of the anti-dip weak interlayer as well as the intrinsic of the dynamic response and the type of the earthquake waves, the frequency of the earthquake waves, the direction to change, the vibration intensity, the height of the slope, the location of the slope and the thickness of the weak layer.(2) The slope of the anti-dip weak interlayer under the strong earthquake will cause the damage on the “crack-shatter collapse” type. The crack of the slope is the main reason to control and it has the characteristic of the banding shatter collapse along the slope side. The damage lies mostly upon the weak layer and the top and middle of the slope. This is caused by the acceleration which is extremely enlarged on that location. when the effect of the earthquake wave is low, the deformation of the slope is less. The main reason for its deformation lies on the X-direction earthquake waves, which has relatively high vibration intensity.(3) ‘Peak phenomemon ’ : The change of the reaction to the X-direction for the anti-dip weak layer relates to the impact of the amplitude for inter-waves. When the amplitude is low, the reaction to the X-direction for the slope increases non-linearly with the height. It reaches to its peak on the top of the slope. When it is closer to the top of the slope, the change of the response becomes larger. However, when the amplitude of the earthquake waves is higher than a particular amount, the peak in on the middle-top of the slope instead of the top of the slope, which is the ‘Peak phenomemon ’ as stated in the passage.(4) Effect of the anti-dip weak interlayer: the higher location, smaller region, degree of the slope deformation and the higher energy dissipation for interlayer when the interlayer of the slope becomes thicker. The PGA indicator of the slope has a lower rate after the anti-dip point and the Z-direction acceleration along the slope has largest decline. The impact of the acceleration is lower inside the slope than along the slope when the thickness of the interlayer change.Upon the anti-dip weak interlayer, the impact of the acceleration decreases when the thickness of the interlayer decrease. Below the interlayer, the impact of the Z-direction acceleration is relatively high along the slope when the thickness change and which is huge under Wenchuan wave when the layer is thicker. The thickness of the interlayer has effect on the location when peak occurs and the amount of response at that point. The thicker the weak interlayer, the lower location of the peak occurs. The response at that point is also low.(5) The deformation of the anti-dip weak layer under the effect of the earthquake has much more relationship with the X-direction speed acceleration impact. The weak layer thickness can influence the location of the slope deformation by affection the X-direction speed acceleration impact. The location of the peak occurs is the same with the concentration deformation of the slope. The thicker the weak layer, the lower for the peak-location, and the location for the slope deformation comes lower.