Examining dynamic soil pressures and the effectiveness of different pile structures inside reinforced slopes using shaking table tests
Examining dynamic soil pressures and the effectiveness of different pile structures inside reinforced slopes using shaking table tests
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DOI：
10.1016/j.soildyn.2018.10.005
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发表时间：
2019-01
影响因子：
4
通讯作者：
Ning Ma;Hong-gang Wu;H. Ma;Xiyong Wu;Gong-hui Wang
中科院分区：
文献类型：
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作者：
Ning Ma;Hong-gang Wu;H. Ma;Xiyong Wu;Gong-hui Wang
为了研究加筋土边坡动土压力的分布和变化，以及不同加固结构形式的有效性，我们对约束抗滑桩（梁桩）和预应力锚杆板桩墙（锚桩）两种加固结构形式的土质边坡进行了不同震动强度下的振动台试验。通过记录的动力响应（模型边坡不同位置的土压力和土加速度）和观察到的试验后行为，分析了两种稳定结构模型在不同震动强度下的响应动态土压力、土加速度、谱位移（Sd）以及位移和倾角的分布。研究发现，在高震动强度下，动土压力的频率含量随频谱中主导频率的变化而变化，且动土压力的变化主要发生在相对较低频段的那些分量上，推测这些变化可能主要是由加固边坡内部响应加速度的变化引起的。最后，通过对比不同震动强度下边坡的谱位移、实测位移和桩块的倾斜度，发现在相同的震动条件下，锚桩比梁桩能更好地支撑边坡。这些结果有助于我们更好地了解动土压力的特征，也为选择稳定结构来加固边坡提供了依据。
To study the distribution and variation of dynamic soil pressures in reinforced soil slopes and the effectiveness of different stabilizing structure types, we conducted a series of shaking table tests on soil slopes reinforced by two types of stabilizing structures: constrained anti-slide pile (beam-pile) and pre-stressed anchor slab-pile walls (anchor-pile), under different shaking intensities. Through examining the recorded dynamic responses (the soil pressures and accelerations measured at different locations in model slopes) and the observed post-test behaviors in the slope models, we analyzed the distributions of response dynamic soil pressures, accelerations, spectral displacements (Sd) and the displacements and inclinations for two stabilizing structure models under different shaking intensities. We found that the frequency contents of the dynamic soil pressures change with a shift in the predominant frequency in the spectrum under high shaking intensity, and the changes in the dynamic soil pressure mainly occur on those components in some relatively low frequency bands, and we infer that these changes may mainly result from the change in the response acceleration within the reinforced slope. Finally, through comparing the spectral displacements in slopes, the measured displacements and the inclinations of pile blocks under different shaking intensities, we found that anchor piles can better support the slope than beam-piles, under similar shaking conditions. These results help us better understand the features of the dynamic soil pressures and also provide evidence to select stabilizing structures for reinforcing the slope against earthquakes.