含小凈距隧道巖石邊坡地震動(dòng)力特性的大型振動(dòng)臺(tái)試驗(yàn)研究
[Abstract]:In order to study the dynamic characteristics of rock slope with small net distance under earthquake, a large shaking table test model of rock slope with small net distance is designed at 1:10. Wenchuan wave (WC) is used as shaking table excited wave in the experiment. The acceleration response characteristics and dynamic displacement response characteristics of slope under earthquake are studied by using three excitation modes, namely horizontal (x) direction, vertical (z) direction and horizontal vertical (xz) direction. The experimental results show that: 1) along the slope surface, the acceleration magnification coefficient shows a nonlinear change characteristic of decreasing first and then increasing, and the slope will change the spectrum composition of the input seismic wave, which can filter the high frequency seismic wave. 2) x, the acceleration magnification factor of the slope will change the frequency spectrum of the input seismic wave. 2) x, Z under unidirectional excitation, the slope acceleration magnification coefficient increases with the increase of the loading acceleration peak value, while that under the xz bi-directional excitation decreases with the increase of the loading acceleration peak value. 3) the slope height is bounded by 3 ~ 5 slope height, and below this height, the slope acceleration magnification coefficient increases with the increase of the loading acceleration peak value. The amplification of vertical seismic wave by slope is greater than that of horizontal seismic wave. 4) the horizontal displacement of slope is mainly influenced by horizontal seismic wave. And it increases with the increase of the peak value of excitation acceleration. 5) the peak value of dynamic displacement increases slowly below this height, and the peak value of dynamic displacement response increases sharply above this height, when the height of the slope is 4? 5, the peak value of dynamic displacement increases slowly under this height. The maximum horizontal displacement is generated at the top of the slope. 6) the dynamic displacement response of the slope is related to the direction of excitation of the seismic wave and the position of the measuring point. The experimental results are helpful to the study of seismic design and seismic dynamic response of tunnel slope with small spacing.
【作者單位】: 中南林業(yè)科技大學(xué)土木工程與力學(xué)學(xué)院;中南林業(yè)科技大學(xué)巖土工程研究所;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(51204125,51404309)
【分類號(hào)】:U451.5
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