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[1]DENG Gaige,HE Jianguo,KANG Ningbo.Research on Capillary Water Height Based on Multi-Physical Field Coupling[J].Research of Soil and Water Conservation,2021,28(04):136-141.

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Research on Capillary Water Height Based on Multi-Physical Field Coupling

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 04 Page number: 136-141 Column: Public date: 2021-08-10

Title:: Research on Capillary Water Height Based on Multi-Physical Field Coupling

Author(s):: DENG Gaige^1,2, HE Jianguo^1,3, KANG Ningbo³; (1.School of Civil Engineering and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2.School of Information Engineering, Yinchuan College, China University of Mining and Technology, Yinchuan 750021, China; 3.School of Agriculture, Ningxia University, Yinchuan 750021, China)

Keywords:: height of capillary water; multi-physics coupling; numerical simulation; soil column experiment; field test

CLC:: S152.7

DOI:: -

Abstract:: In order to study the rising characteristic and mechanism of capillary water, the rising height of capillary water of sandy soil with different grain sizes was studied by numerical simulation under indoor and field tests. The results show that: under the same compaction condition, the rising height of capillary water is approximately in a power function relationship with the duration; the characteristic of the change is that the initial height increases rapidly, and after a certain degree, it increases slowly; the rising speed of capillary water is approximately exponentially related to the duration, and the specific performance is that the rising speed is relatively large in the initial stage but then rapidly decreases; the ascending height of the capillary water of the sandy soil column with different particle sizes follows the order of No. 1 tube(the particle size range is 0.36～0.45 mm)>No. 2 tube(the particle size range is 0.28～0.36 mm)> No. 3 tube(the particle size range is 0.15～0.28 mm), the rising height of capillary water is negatively correlated with the particle size of sand, the overall performance is that the smaller the particle size, the greater the rising height of capillary water; through multi-physics coupling Darcy's law and phase transport in porous media, the capillary water rising height can be simulated better, and the theoretical value is in good agreement with the laboratory test results within the experimental error range, at the same time, the field test also verifies the correctness of the conclusions of numerical simulation and laboratory soil column test. The research shows that the capillary flow phenomenon in porous media is caused by inertial force, viscous force, capillary force and gravity. However, at different capillary heights, the contribution of each force to capillary rise is different, and it comprehensively acts on the capillary water rise process.

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Last Update: 2021-08-20