Capillary Suction Measurements in Granular Materials and Direct Numerical Simulations Using X-Ray Computed Tomography Microstructure

被引:14
作者
Thakur, Mohmad Mohsin [1 ]
Penumadu, Dayakar [2 ]
Bauer, Constantin [3 ]
机构
[1] Univ Tennessee, Dept Civil & Environm Engn, 851 Neyland Dr,325 John D Tickle Bldg, Knoxville, TN 37996 USA
[2] Univ Tennessee, Dept Civil & Environm Engn, Fred N Peebles Prof & Joint Inst Adv Mat Chair Ex, 851 Neyland Dr,325 John D Tickle Bldg, Knoxville, TN 37996 USA
[3] Math2Market Gmbh, Richard Wagner Str 1, D-67655 Kaiserslautern, RP, Germany
关键词
Soil water retention curve (SWRC); X-ray computed tomography; Grain morphology; Phase distributions; MORPHOLOGY-BASED SIMULATION; STRAIN-RATE BEHAVIOR; PORE-SCALE; UNSATURATED SOILS; AXIS-TRANSLATION; POROUS-MEDIA; SAND; MOISTURE; SATURATION; DRAINAGE;
D O I
10.1061/(ASCE)GT.1943-5606.0002194
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Because of the recent advancements in hardware and reconstruction algorithms, multiphase flow modeling in porous media is experiencing a shift toward using advanced imaging techniques such as X-ray computed tomography in conjunction with direct numerical simulations. This approach captures heterogeneities in soil samples utilized in laboratory testing and results in quick and less tedious predictions compared to the existing methods. In this paper, an experimental setup is developed specifically to validate numerical predictions of the soil water retention curve (SWRC) for two types of sands with identical size but distinct grain morphology of round (Ottawa sand) and angular particle shape (Q-Rok). The complex 3D pore network is captured noninvasively using high-resolution attenuation-based X-ray computed tomography. The numerical predictions are carried out by solving a Young-Laplace equation using the pore morphology method. The experimental results and numerical predictions match well, including the effect of hysteresis in SWRC measurements. The spatial distribution of pore water and pore air corresponding to different capillary suctions is obtained from numerical predictions, providing greater insights into the hydromechanical behavior of partially saturated soils. The sensitivity of the voxel size on simulations is quantified by predicting the pore size distribution of Ottawa sand at three different tomography resolutions.
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页数:13
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