含不连续面岩质边坡动力响应研究
Journal of Railway Science and Engineering（2017）
Abstract
设计并制作2个相同尺寸的含不连续面顺层和反倾岩质边坡模型,并进行振动台试验,研究含不连续面顺层和反倾岩质边坡的动力响应差异.研究结果表明:地震作用下,含不连续面的顺层和反倾岩质边坡坡内和坡面的PGA放大系数均随高程增大,即具有高程放大效应.顺层和反倾边坡在坡顶处PGA放大系数最大,说明坡顶最不稳定.在地震波幅值较少的情况下,无论是坡内还是坡面,反倾边坡的PGA放大系数都大于顺层边坡的;但随地震波幅值的增加,顺层边坡的PGA放大系数大于反倾边坡的.随地震荷载的增加,含不连续面顺层和反倾岩质边坡坡面位移均大幅度增加,反倾边坡坡面位移小于顺层边坡.反倾边坡比顺层边坡更稳定.顺层边坡沿不连续面滑动破坏,而反倾边坡则是由于近似垂直方向的张拉裂缝与边坡中下部的剪切裂缝贯通进而发生整体失稳破坏.
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Key words
PGA amplification factor,rock slope,discontinuous joints,shaking table test,dynamic response
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