Yao Tang, Haohao Wei, Yunmin Chen, Bo Huang, Shuai Zhang
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引用次数: 2
Abstract
A model was proposed to predict the permeability of granular soil with various gradations. The pore size distribution for different particle sizes was determined by considering different particle combinations and occurrence probabilities, which was then used in the fractal and capillary model for predicting soil permeability. The proposed model was verified by experiments and exhibited higher accuracy than other models. Upon verifying by over 60 tests, the mean absolute percent error using this proposed model was 18% for the permeability predictions of spherical granular soils. The pore size distribution predicted by the model was verified by computed tomography to capture the pore characteristics of different soil gradations. The proposed model only requires three parameters (soil particle size distribution, void ratio, and relative density) to predict soil permeability, and no empirical or calibrated parameters are needed. A parametric analysis showed that the gradation significantly affected soil permeability. Even when porosity and the characteristic particle size, d50, are the same, as the particle size distribution narrows and the gradation range decreases, the permeability coefficient can increase by 80%. The permeability increased with the void ratio and decreased as the relative density increased. The proposed model provides a practical approach for predicting the permeability of granular soils and considers the effect of the particle size distribution.
期刊介绍：
Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science.
These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations.
>> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa.
The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.
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