Void Ratio–Dependent Water Retention Model for a Deformable Residual Clay

Xu, Xu-tang; Wen-bin, Jian; Neng-sen, WU; Xu, Xingkai; Shao, Lian-jin

doi:10.1061/(asce)gm.1943-5622.0001773

Cited by 6 publications

(3 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The micro-cracks in the soil propagated and expanded, which gradually formed a water transport channel. The number of meso-pores and macro-pores in the soil gradually increased; this decreased the water absorption rate of the soil during the wetting part of the cycle, which lowered the saturation point [46,59].…”

Section: Analysis Of the Soil-water Characteristic Curve (Swcc)mentioning

confidence: 99%

“…The drying-wetting cycles caused the clay minerals in the soil to expand and contract as the microscopic pore water migrated back and forth. The fatigue damage caused by the changing internal microstructure of the soil manifested with the hydrolysis of cement particles, coarsening of pores, and crack formation [56,59]. Meanwhile, the connection between aggregates was continuously destroyed, causing the dispersion of aggregates, coarsening of the original pores, formation of voids, and transformation of smaller pores into larger pores.…”

Section: Geofluidsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Drying–Wetting Cycles on the Water Retention and Microstructure of Residual Soil

Liu

Xian

et al. 2022

Geofluids

Self Cite

View full text Add to dashboard Cite

Due to frequent changes in the humid and hot environment, the residual soil with a particle-size distribution (PSD) from gravel to clay experiences multiple drying–wetting cycles. The pressure plate test and nuclear magnetic resonance (NMR) spectroscopy were used to investigate the influence of drying–wetting cycles on the soil–water characteristic curve (SWCC) and pore-size distribution (POSD) of undisturbed residual soil. The results showed that the water-holding capacity of the residual soil decreased as the number of drying–wetting cycles increased and gradually stablilized, and then the van Genuchten (VG) model was found to perform well on the SWCC during the drying–wetting processes. The NMR results indicated a double-pore structure, and the porosity of the residual soil as well as the internal water content increased smoothly with more drying–wetting cycles. The obtained POSD curve of soil implied that drying–wetting cycles had a more obvious effect on small pores and macro-pores than on micro-pores and meso-pores. Theoretical calculations evinced that the product of the matric suction and relaxation time should be constant at a constant temperature. However, the experimental results did not effectively reflect such a relation between the matric suction and relaxation time. A modified VG model based on the cumulative pore volume was utilized to describe the POSD under drying–wetting cycles. Subsequently, the proposed Rational2D surface equation was used to accurately reflect the internal relationship between the SWCC and POSD curve under different numbers of drying–wetting cycles. Moreover, the fractal model for the SWCC derived from the capillary theory confirmed that the matric suction had a strong linear relationship with the relative volumetric water content in the log-log scale. Also, the fractal dimension can be approximated as a constant, because its attenuation is small with more drying–wetting cycles.

show abstract

Section: Analysis Of the Soil-water Characteristic Curve (Swcc)mentioning

confidence: 99%

Section: Geofluidsmentioning

confidence: 99%

Influence of Drying–Wetting Cycles on the Water Retention and Microstructure of Residual Soil

Liu

Xian

et al. 2022

Geofluids

Self Cite

View full text Add to dashboard Cite

show abstract

“…Undisturbed soil samples maximize the integrity of the natural structure of the soil, so the results obtained from insitu soil testing can reflect the properties of the in-situ soil in the field to the best extent. China is a country with frequent occurrence of landslides (Zhang, et al, 2021a;Zhang Z et al, 2020;Lee, et al, 2021;Xu, et al, 2020), especially in the Fujian area where hills and mountains are developed, and granite residual soil is widely distributed. The climate in this area is humid and rainy.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Matrix Suction of Unsaturated Granite Residual Soil Slope Based on Electrical Conductivity

et al. 2022

View full text Add to dashboard Cite

To study the relationship between matrix suction and conductivity in unsaturated granite residual soil and realize the matrix suction prediction of soil slope based on conductivity, laboratory and field tests are carried out on undisturbed soil at different depths of the Yandou village landslide in Sanming City, Fujian Province, China. Through physical and chemical property analysis, soil-water characteristic curves and electric parameter matrix suction prediction models for unsaturated granite residual soil at different depths of the target area are obtained. Based on the proposed model, the matrix suction distribution of on-site soil slope is predicted and the dynamic response law under the influence of artificial rainfall is studied. The results show that: (1) The transverse conductivity, average structure factor, average shape factor, and anisotropy coefficient of unsaturated soil are related to the soil saturation degree. By considering the above parameters, the comprehensive structure parameter Re is introduced and its functional relationship with matrix suction is established. (2) Under artificial simulated rainfall, the saturation, hysteresis of the conductivity parameters, and matrix suction response of the slope occurs, which is controlled by soil depth, permeability and rainfall intensity. The matrix suction is distributed in layers on the profile and its recovery rate is slower than saturation. The suction contour map shows a parabola shape with the opening downward. (3) The relationship between the conductivity parameters of the residual soil slope and matrix suction is further revealed and a new method to indirectly measure matrix suction is proposed. Its feasibility is verified based on field tests, which is of great significance to landslide monitoring and early warning.

show abstract

Exploring the effect of volume change on capillary soil water retention in an undisturbed silty clay: an experimental and modeling approach

Wei,

Fan,

Deng

et al. 2024

Acta Geotech.

View full text Add to dashboard Cite

Void Ratio–Dependent Water Retention Model for a Deformable Residual Clay

Cited by 6 publications

References 47 publications

Influence of Drying–Wetting Cycles on the Water Retention and Microstructure of Residual Soil

Influence of Drying–Wetting Cycles on the Water Retention and Microstructure of Residual Soil

Prediction of Matrix Suction of Unsaturated Granite Residual Soil Slope Based on Electrical Conductivity

Exploring the effect of volume change on capillary soil water retention in an undisturbed silty clay: an experimental and modeling approach

Contact Info

Product

Resources

About