论文部分内容阅读
地震作用下堆积体边坡的动力响应特性十分复杂,单一抗震安全系数不足以评价其动力稳定性。通过大型振动台试验,研究了连续多级地震荷载作用下,地震波的类型、卓越频率及峰值加速度对堆积体边坡坡面永久位移的影响,并初步分析其失稳机制。试验结果表明,相同峰值加速度下振动型地震波比冲击型地震波更容易产生坡面永久位移,地震波卓越频率对坡面永久位移也有重要影响;堆积体边坡在峰值加速度apeak=0.2g时开始有大颗粒石砾滚落,对应的坡面永久位移在apeak=0.2g~0.3g之间开始产生并显著增大,另外利用考虑坡面几何形态变化的改进Newmark法对坡顶的永久位移进行了估算。通过坡面永久位移评价堆积体边坡的动力稳定性有一定合理性。
The dynamic response of the pile slope under earthquake is very complex, and the single seismic safety factor is not enough to evaluate its dynamic stability. Through large-scale shaking table test, the effect of seismic wave type, excellent frequency and peak acceleration on the permanent displacement of the slope of the pile is studied under continuous multi-stage seismic loading. The instability mechanism is also analyzed. The experimental results show that the vibrational seismic waves at the same peak acceleration are more likely to produce permanent displacement of the slope than the impact type seismic waves, and the remarkable frequency of the seismic waves also has an important influence on the permanent displacement of the slope. The slope of the sediment starts to have a large peak acceleration of apeak = 0.2g The granite gravel rolled off, and the corresponding permanent displacement of the slope started to increase and markedly increased from apeak = 0.2g ~ 0.3g. In addition, the permanent displacement of the top of the slope was estimated by the improved Newmark method considering the change of slope geometry . It is reasonable to evaluate the dynamic stability of the slope of pile body by the permanent displacement of slope.