Experiment and modeling of soil-water characteristic curve of unsaturated soil in collapsing erosion area

• Autorzy: Liu W. , Luo X. , Fu M. , Huang J.
• Języki publikacji: EN

Abstrakty

EN

Soil erosion tends to occur with rainfall runoff, thus leading to grave soil and water loss. An increase of water content in soil caused by rain makes the loss of matrix suction and the decrease of shear strength obvious, and will promote soil erosion. The soil-water characteristic curve (SWCC) can be used to describe the relationship between the water content and the matrix suction in unsaturated soil. For this paper we studied the SWCCs of the granite residual soils in a collapsing erosion area in Jiangxi Province, China. A GEO-Experts pressure plate extractor was used to measure SWCCs for soils with different dry density, grain size, drying and wetting cycles, and lime content. The initial dry density has a significant impact on SWCC. With increasing dry density, the suction was decreased for the same water content. The larger the grain size, the greater the suction value for the same volumetric water content. Under the same suction, the volumetric water content decreases as the lime percentage increases and water stability improves. SWCCs of the drying and wetting cycle demonstrate the hysteresis phenomenon. The area of the hysteresis loop decreased with the increase of the dry density and drying and wetting cycle number. It also became small when the soils were mixed with lime. In this paper, the Van Genuchten model, the Fredlund and Xing model, and the Gardner model were used to fit the experimental data of SWCCs. The presented fitting parameters show that the residual sum of squares is less than 0.002. All the experimental data fit well to three models for SWCC. The results indicated that the simulated value of the Gardner model does provide best agreement with the measured value. These results will provide an important basis for the further study of the soil collapsing erosion process and soil cover design.

• Wydawca: -
• Czasopismo: Polish Journal of Environmental Studies
• Rocznik: 2016
• Tom: 25
• Numer: 6
• Opis fizyczny: p.2509-2517,fig.,ref.

Twórcy

autor

Liu W.

• School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
• ARC Centre of Excellence for Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia

autor

Luo X.

• School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
• Jiangxi Science and Technology Normal University, Nanchang 330013, China

autor

Fu M.

• School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China

autor

Huang J.

• School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
• ARC Centre of Excellence for Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia

Bibliografia

• 1. SHENG D., GENS A., FREDLUND D.G., SLOAN S.W. Unsaturated soils: From constitutive modelling to numerical algorithms. Computers and Geotechnics, 35 (6), 810, 2008.
• 2. LI X., LI J.H., ZHANG L.M. Predicting bimodal soil-water characteristic curves and permeability functions using physically based parameters. Computers and Geotechnics, 57, 85, 2014.
• 3. RAO B.H., SINGH D.N. Establishing Soil-Water Characteristic Curve of a Fine-Grained Soil from Electrical Measurements. Journal of Geotechnical and Geoenvironmental Engineering, 136 (5), 751, 2010.
• 4. SEDANO J.A.I., VANAPALLI S.K. Experimental investigation of the relationship between the critical state shear strength of unsaturated soils and the soil-water characteristic curve. International Journal of Geotechnical Engineering, 5 (1), 1, 2011.
• 5. FREDLUND D.G., XING A. Equations for the soil-water characteristic curve. Canadian Geotechnical Journal, 31 (4), 521, 1994.
• 6. FREDLUND D.G., HOUSTON S.L. Interpretation of soilwater characteristic curves when volume change occurs as soil suction is changed. In Advances in Unsaturated Soils - Proceedings of the 1st Pan-American Conference on Unsaturated Soils, 15, 2013.
• 7. ZHOU W., YUEN K., TAN F. Estimation of soil–water characteristic curve and relative permeability for granular soils with different initial dry densities. Engineering Geology, 179, 1, 2014.
• 8. JACINTO A.C., VILLAR M.V., G MEZ-ESPINA R., LEDESMA A. Adaptation of the van Genuchten expression to the effects of temperature and density for compacted bentonites. Applied Clay Science, 42 (3-4), 575, 2009.
• 9. IYER K., JAYANTH S., GURNANI S., SINGH D.N. Influence of Initial Water Content and Specimen Thickness on the SWCC of Fine-Grained Soils. International Journal of Geomechanics, 13 (6), 894, 2013.
• 10. SUN W., SUN D., FANG L., LIU S. Soil-water characteristics of Gaomiaozi bentonite by vapour equilibrium technique. Journal of Rock Mechanics and Geotechnical Engineering Geology, 6 (48-54), 2014.
• 11. GALLAGE C.P.K., UCHIMURA T. Effects of dry density and grain size distribution on soil-water characteristic curves of sandy soils. Soils and Foundations, 50 (1), 161, 2010.
• 12. ROMERO E., DELLA V.G., JOMMI C. An insight into the water retention properties of compacted clayey soils. Geotechnique, 61 (4), 313, 2011.
• 13. NG C.W.W., LEUNG A.K. In-situ and laboratory investigations of stress-dependent permeability function and SDSWCC from an unsaturated soil slope. Geotechnical Engineering Journal of the SEAGS & AGSSEA, 43 (1), 26, 2012.
• 14. RAHARDJO H., SATYANAGA A., D’AMORE G.A.R., LEONG E.-C. Soil-water characteristic curves of gap-graded soils. Engineering Geology, 125, 102, 2012.
• 15. SATYANAGA A., RAHARDJO H., LEONG E.-C., WANG J.-Y. Water characteristic curve of soil with bimodal grainsize distribution. Computers and Geotechnics, 48, 51, 2013.
• 16. JADCZYSZYN J., NIEDźWIECKI J. Relation of saturated hydraulic conductivity to soil losses. Polish Journal of Environmental Studies, 14 (4), 431, 2015.
• 17. LIU X., TANG C., ZHANG D. Simulated runoff processes on colluvial deposits of Liantanggang Benggang and their water distributions. Transactions of the Chinese Society of Agricultural Engineering 31 (11), 179, 2015.
• 18. VULEVIĆ T., DRAGOVIĆ N., KOSTADINOV S., SIMIĆ S. B., MILOVANOVIĆ I. Prioritization of soil erosion vulnerable areas using multi-criteria analysis methods. Polish Journal of Environmental Studies, 24 (1), 317, 2015.
• 19. HUANG X., WANG C., WANG T., ZHANG Z. Quantification of geological strength index based on discontinuity volume density of rock masses. International Journal of Heat and Technology, 33 (4), 255, 2015.
• 20. XIA D., DENG Y., WANG S., DING S., CAI C. Fractal features of soil particle-size distribution of different weathering profiles of the collapsing gullies in the hilly granitic region, south China. Natural Hazards, 79 (1), 455, 2015.
• 21. LIU X., LIAN H. Distribution choices of elevation and slope orientation of collapsing hills. Bulletin of Soil and Water Conservation, 31 (4), 32, 2011.
• 22. GENUCHTEN M.T.V. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil science society of America journal, 44 (5), 892, 1980.
• 23. GARDNER W.R. Some steady state solutions of the unsaturated moisture flow equation with application to evaporation from a water table. Soil Science, 85 (4), 228, 1958.
• 24. PHOON K.K., SANTOSO A., QUEK S.T. Probabilistic Analysis of Soil-Water Characteristic Curves. Journal of Geotechnical and Geoenvironmental Engineering, 136 (3), 445, 2010.

Identyfikatory

DOI

10.15244/pjoes/64307