On the mechanism of the formation of horizontal cracks in a vertical column of saturated sand |
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Authors: | Che-Min Cheng Tan Qingming Peng Fujiao |
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Affiliation: | (1) State Key Laboratory of Nonlinear Mechanics, Chinese Academy of Sciences, 100080 Beijing, China;(2) Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | Extended horizontal cracks have been observed experimentally in a vertical column of saturated sand when a flow of water is forced to percolate upward through it. This paper provides a theory for this phenomenon. It will be shown that the presence of inhomogeneity in permeability along the length of the column is essential for such cracks to develop. It will also be shown that small initial inhomogeneity may be magnified through the transport of the finer component of the sand by percolation. Under certain conditions liquefaction takes place at a section of the sand column causing a crack to initiate and grow there. This theory is found to be in good qualitative agreement with the experimental findings. The project supported by the National Natural Science Foundation of China (19832010) |
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Keywords: | liquefaction cracks percolation |
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