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| Effect of pore structure parameters on the loss of fine grain during suffusion |
| WEI Haijiang1, XU Zengguang1*, GENG Kaiqiang1,FENG Shangxin2 |
| 1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi′an University of Technology, Xi′an, Shaanxi 710048, China;2. School of Architecture and Civil Engineering, Xi′an University of Science and Technology, Xi′an, Shaanxi 710054, China |
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Abstract The evolution of pore size distribution during suffusion was monitored by nuclear magnetic resonance, and the grain size distribution of lost fines was measured by a self-programmed particle size recognition program. Finally, the influence of pore structure parameters on the loss of fines was discussed using gray system theory. The results show that the lower the initial fines content, the more severe the suffusion. When the hydraulic gradient was constant, the cumulative fines loss percentage increased exponentially with time, and the suffusion process could be divided into development, slow erosion and equilibrium stage. The sensitivity of fines to suffusion increased with the decrease of grain size, while the influence degree of surface morphology on the migration of fines decreased with the decrease in grain size. The intensity of the soil-water interaction during the suffusion was positively correlated with the initial fines content and hydraulic gradient, respectively. In general, the connectivity and heterogeneity of constriction size distribution gradually increased, the complexity gradually decreased, and the equivalent opening size gradually increased during the suffusion. The influence of pore structure parameters on fines loss from large to small is as follows: fractal dimension, non-uniform coefficient, controlled constriction size, and most probable pore size.
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Received: 13 December 2022
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