双排抗滑桩抗震性能振动台试验研究及数值分析

Shaking table test studies and numerical analysis of double-row anti-slide piles under earthquake

为探讨双排抗滑桩支护下边坡的地震响应及破坏机理,进行振动台模型试验及数值分析。研究结果表明:由于边坡上部缺乏必要支护,裂缝首先在靠近坡顶的坡面与滑面相交处产生;随着地震作用的增大,裂缝沿着滑面向下发展,由于抗滑桩的支挡作用而改变下滑方向,最终发生越顶破坏;监测点加速度响应能够反映边坡的物理特性,当坡体产生裂缝或临近最终破坏时,加速度响应规律将发生突变;桩身动土应力分布形式受地震波峰值影响很大,在高烈度下边坡接近破坏时,滑坡推力主要由靠近滑体的桩体上部承担,因此,在抗震设计时桩体上部同样需要加强。

Shaking table test and numerical analysis were adopted to explore the seismic response and failure mechanism of a slope with double-row anti-slide piles. The results show that due to lack of necessary support on the slope crest, crack appears on the slope crest firstly and develops downwards along the weakness interlayer, and then changes its way to get across the top of piles; acceleration response of monitoring points can reflect the physical conditions of the slope,and when crack appears or the slope gets close to destruction, the former rules of acceleration response would change suddenly. The amplitudes of earthquake have great influences on the dynamic stress distribution of piles, when the earthquake intensity is high and the slope is on the verge of destruction, the majority of landslide thrust is resisted by the upper part of piles, so the upper part of piles is also very important in the seismic design.