Predicting hysteresis loops of the soil water characteristic curve from initial drying

Zhao, Yanru; Wen, Tiande; Shao, Longtan; Chen, Rui; Sun, Xiaohui; Huang, Liping; Chen, Xiang-Sheng

doi:10.1002/saj2.20125

Cited by 25 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Wen et al (2020b) showed that the water retention capacity of silt and clay decreased with increasing number of drying-wetting cycles. Zhao et al (2020) measured SWCCs during wetting and drying using a pressure plate instrument in multistep outflow experiments and proposed a simplified equation for the main wetting and drying curves, based on the inkbottle effect and entrapped air effects. Wen et al (2021) pointed out that the void ratio of soil is affected by its shrinkage behavior, and thus affects the SWCC.…”

Section: Introductionmentioning

confidence: 99%

Study on soil-water characteristic curves in the profiles of collapsing walls of typical granite Benggang in southeast China

Zhang¹,

Sun²,

Lin³

et al. 2022

PeerJ

View full text Add to dashboard Cite

Benggang with steep collapsing walls is one of the worst soil erosion problems in South China. The collapse of walls is the most critical process in Benggang development. This is mainly due to the soil water properties. The soil water characteristic curve (SWCC) is a key indicator for analyzing soil moisture, but the SWCC and its mechanism of influence in collapsing walls remain obscure. A pressure plate meter was used for drying experiments to research the SWCCs of undisturbed soils of five layers (from top to bottom: red soil layer, transition layer I, sand soil layer, transition layer II and detrital layer) of two typical collapsing walls. The van Genuchten (VG) model can be fitted to the SWCCs for different layers (NSE ≥ 0.90). With increasing soil depth, the parameters a and θs first decreased and then increased, the parameters n first increased and then decreased, θr declined as the soil depth increased. These findings illustrate that soil water holding capacity decreases with increasing soil depth. The bottom of the soil is weak in water retention and water can easily reach saturation, resulting in a decline in soil stability, thus promoting soil collapse and finally inducing upper soil collapse. Furthermore, gravel content and particle morphology are factors that should not be neglected for SWCCs. The results of this study provide a theoretical basis for understanding the process of wall collapse in Benggang landforms in South China.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on soil-water characteristic curves in the profiles of collapsing walls of typical granite Benggang in southeast China

Zhang¹,

Sun²,

Lin³

et al. 2022

PeerJ

View full text Add to dashboard Cite

show abstract

“…The SWRC is the basis for the estimation of hydraulic parameters, which are the required inputs for simulations of water flow and solute transport (Smagin, 2011;Xing et al, 2018bXing et al, , 2021. In many previous researches, the SWRC was widely adopted to evaluate the size and distribution of soil pores and soil water availability (Mengistu et al, 2019;Neyshaburi et al, 2015); moreover, among the SWRC models, the van-Genuchten model (van Genuchten, 1980) and the Brooks-Corey model (Brooks and Corey, 1964) were also widely applied to determine soil hydraulic conductivity and soil water diffusivity (Latorre and Moret-Fern andez, 2019;Ma et al, 2016;Peña-Sancho et al, 2017;Wen et al, 2019;Zhao et al, 2020). Another exponential model of the hydraulic conductivity-soil suction relationship, the Gardner-Russo model (Gardner, 1958;Russo, 1988), has not yet been widely focused or utilized for hydraulic parameter derivation in recent years.…”

Section: Introductionmentioning

confidence: 99%

Determination of soil water hydraulic parameters from infiltration data

Gao

Chang

Xing

et al. 2021

View full text Add to dashboard Cite

PurposeTraditional laboratory measurements of soil water diffusivity (D) and soil water retention curve (SWRC) are always time-consuming and labor-intensive. Therefore, this paper aims to present a simple and robust test method for determining D and SWRC without reducing accuracy.Design/methodology/approachIn this study, a D model of unsaturated soil was established based on Gardner–Russo model and then a combination of Gardner–Russo model with one-dimensional horizontal absorption method to obtain n and a parameters of Gardner–Russo model. One-dimensional horizontal absorption experiments on loam, silt loam and sandy clay loam were conducted to obtain the relationships between measured infiltration rate and cumulative infiltration with wetting front distance. Based on the obtained relationships, the measured infiltration data from the one-dimensional horizontal absorption tests were used to calculate n and a parameters and further constructing D and SWRC.FindingsBoth the calculated D and SWRC inversed from the infiltration data were in good agreement with the measured ones that obtained from the traditional horizontal absorption method and the centrifuge method, respectively. Error analysis indicated that only the infiltration data are enough to reliably synchronously determine D and SWRC.Originality/valueA simple and robust method is proposed for synchronous determination of soil water diffusivity and water retention curve.

show abstract

“…e CDG at the top of the tunnel will induce the floating deformation in a loading-unloading process; therefore, it is necessary to obtain the CDG soil properties for construction guidance [6][7][8][9][10][11][12][13][14][15][16]. Lan et al [3] statistically analyzed the differences in composition, stress, and strain characteristics of CDG with different degrees of weathering in southern China.…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Path on the Mechanical Properties of Completely Decomposed Granite Soil Based on the Multiscale Method

Zhao

Wen

Sun

et al. 2021

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

Mechanical properties of intact completely decomposed granite (CDG) soil, widely distributed in South China, decrease drastically as encountering external load-related disturbance or soaked by water. In this study, staged triaxial consolidated drained (CD) test and microscopic scanning were conducted using intact CDG specimens extracted from a construction site to investigate the mechanical behavior and microscopic pore distribution. The results show that the stress-strain relationship reveals a shrinking behavior in the first-stage loading and a brittle behavior in the second-stage loading. The development of cracks is affected by the principal stress, which causes the pores and cracks to shrink or partially close. In addition, Esec-1 increases linearly with the increase of confining pressure, but Esec-2 decreases exponentially.

show abstract

Predicting hysteresis loops of the soil water characteristic curve from initial drying

Cited by 25 publications

References 23 publications

Study on soil-water characteristic curves in the profiles of collapsing walls of typical granite Benggang in southeast China

Study on soil-water characteristic curves in the profiles of collapsing walls of typical granite Benggang in southeast China

Determination of soil water hydraulic parameters from infiltration data

Effect of Loading Path on the Mechanical Properties of Completely Decomposed Granite Soil Based on the Multiscale Method

Contact Info

Product

Resources

About