反倾边坡支护结构的拉筋动力响应振动台试验研究

Experimental Research on Dynamic Response Shaking Table of Tie Bar of Counter-tilt Slope Supporting Structure

采用几何相似比为1∶30的模型,模拟含泥化夹层的反倾岩质边坡振动台试验,在EL Centro地震波、汶川地震波和人工波的作用下,研究了预应力锚索(杆)拉筋轴力的动力响应规律。结果表明:泥化夹层饱水后,不同高程处拉筋轴力的地震动力响应值均大于泥化夹层饱水前;拉筋轴力的最大值并不随着输入地震波峰值(PGA)的增加而递增,在汶川地震波激振下,当PGA=0.3 g时达到峰值;拉筋预应力的损失值随着高程的增加而增大,随着输入地震波峰值的增加而收敛。

The model with geometric similarity ratio of 1 ∶ 30 is adopted to simulate the shaking table test of counter-tilt slope with argillizationinter layer. The dynamic response regularity of the axial force of pre-stressed anchor cable（ rod） under the EL Centro,Wenchuan and artificial seismic waves is studied. The test results show that the dynamic response values of the axial force of pre-stressed anchor cable under the seismic action after the argillizationinter layer saturation are higher than that before saturation. And the maximum axial force of tie barwill not increase with the input of seismic wave peak. Under the excitation of Wenchuan seismic wave,when PGA = 0. 30 g,the peak value appears. The loss of prestress of tie bar will increase with the increasing of elevation and reduce with the increasing of input seismic wave peak.