Investigation on tamping spacing in dynamic compaction using model tests
Investigation on tamping spacing in dynamic compaction using model tests
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DOI：
10.1680/grim.12.00018
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
M. Hajialilue-Bonab;F. Zare
中科院分区：
文献类型：
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作者：
M. Hajialilue-Bonab;F. Zare
采用粒子图像测速技术，研究了夯击间距和夯击方式对松散干砂强夯效果的影响。建立了一个小型的强夯物理模型。采用半圆柱形钢夯锤在砂存款上不同距离的两点上升降夯实。在所有测试中，捣固器的重量和跌落高度保持恒定。在每次跌落后拍摄数码照片。通过对数字图像序列的图像处理，得到了土壤变形以及每滴水对土壤改良效果的影响。绘制了不同水深下相对密度增加与标准化深度的关系图，它可用于获得最佳水深，以获得给定深度下的有效密度。试验结果还表明，在干砂改良中，夯锤间距约为夯锤直径的4倍（4D）是最有效的。捣固方式也会影响压实度。
The effect of tamping space and pattern in dynamic compaction has been investigated on loose dry sand using particle image velocimetry technique. A small-scale physical model of dynamic compaction was prepared. Tamping was executed by rising and dropping semi-cylindrical steel tampers on sand deposit at two points with different distances. In all the tests, the weight of the tampers and drop height were kept constant. Digital photographs were taken after each drop. Using image processing on sequences of digital images, soil deformation and the effect of each drop on the soil improvement were obtained. The diagram of relative density increase against normalised depth has been plotted for different tamping spaces, and it can be used for achieving the optimum tamping distance in order to obtain efficient density at a given depth. The results also show that the tamping space about four times of tamper diameter (4D) is the most efficient in dry sand improvement. Tamping pattern can also influence the compactio...