Predicting chemical influence on soil water retention curves with models established based on pore structure evolution of compacted clay

Lu, Pu-huai; He, Yong; Zhang, Zhao; Ye, Weimin

doi:10.1016/j.compgeo.2021.104360

Cited by 19 publications

(5 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The WRC displayed in Figure 1 shows the relationship between the GCL at varying water salinity conditions during the drying process while maintaining a constant volume. The WRC provides crucial insights into the GCL's function to retain water under different environmental conditions [4,13]. The results obtained from this study offer valuable observations.…”

Section: Wrc On the Drying Path Of Gclmentioning

confidence: 80%

“…Therefore, it is imperative to assess the efficacy of the GCL as an anti-seepage barrier across various water content conditions. A comprehensive understanding of the water absorption and dehydration characteristics of GCLs with a constant volume is crucial for their long-term performance evaluation [13][14][15]. The water retention curve (WRC) describes the relationship between water content and suction in unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling the Salinity Effect on the Water Retention Curve of Geosynthetic Clay Liner (GCL) on the Drying Path

Zeng

Wan

et al. 2023

Materials

View full text Add to dashboard Cite

The water retention curve (WRC) of a geosynthetic clay liner (GCL) is influenced by the presence of exchangeable cations in the leachate during changes in water content in a landfill construction. This research aims to investigate the impact of salinity on the WRC of GCL. To measure the WRC of GCL under different sodium chloride (NaCl) concentrations on the drying path, a chilled-mirror dew-point device capable of controlling the GCL’s volume was employed. Additionally, the dry state microstructure of the GCL was examined using electron microscopy. The test outcomes indicate that GCL hydrated with higher salinity has greater suction at the same water content during drying. This influence can be attributed to changes in salinity and the precipitation of NaCl crystals within the bentonite when water evaporates, which in turn affects the bentonite’s microstructure and leads to increased matric suction. By introducing the Fredlund and Xing model and parameter relationship, it is possible to predict the WRC of GCL under salinity effects after measuring the WRC under different salinity conditions on the drying path.

show abstract

Section: Wrc On the Drying Path Of Gclmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Modeling the Salinity Effect on the Water Retention Curve of Geosynthetic Clay Liner (GCL) on the Drying Path

Zeng

Wan

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…As the thickness of water films increased, clay particles separate from each other and the cohesiveness between them gradually reduced. Correspondingly, the clay structure underwent softening and degradation, and the clay minerals transferred from a tightly face-face arrangement to a loosely face-edge or even edge-edge one, leading to a reduction in mechanical strength (Zhang et al, 2016;Lu et al, 2021).…”

Section: Microstructural Analysismentioning

confidence: 99%

Effects of Rainfall on Mechanical Behaviors of Residual-Soil Landslide

Zhang

et al. 2022

Front. Earth Sci.

Self Cite

View full text Add to dashboard Cite

Rainfall-induced landslides commonly occur in residual-soil layers of Chenzhou city, China. Slope failure induced by rainfall is intimately related to changes in the mechanical property and microstructures of residual soils. In this study, series of direct shear tests were respectively conducted on four typical residual soils from the area of Chenzhou to study influences of rainwater on their mechanical behaviors. Meanwhile, X-ray diffraction (XRD) tests and scanning electron microscope (SEM) tests were also performed to investigate microstructure characteristic of several types of soils. Experimental results revealed that the shear strength of soils decreased with increasing water content and its development trends were obviously influenced by the types of residual soils. Meanwhile, the shear strength of soils increased with the increase of vertical loads, and the relationship between them could be well expressed by a linear function. As water content increased, the calculated cohesions and internal friction angles both decreased. XRD observations implied that several residual soils showed rich clay minerals, including pyrophyllite, illite, kaolinite and montmorillonite, etc. Microstructures of these soils presented a sheet-structure system which was composed of various-sized clay particles. During hydration, these clay minerals gradually transferred from a face-face arrangement to face-edge or even edge-edge one, leading to the softening of clay particles and the reduction of the contact force between soil particles.

show abstract

“…As shown in Figure 8, the surface of coral sand is rough and porous and rich in internal pores due to biological origin, and the gradual formation of new pores during sulfate ion erosion has a great impact on the strength of coral sand mortar. After adding GO, it has a good blocking effect on the formation of coral sand mortar erosion pores, to quantify the effect of 7 Geofluids GO on the evolution of pore parameters, the SEM images of coral mortar specimens magnified 100 times were binarized, and the microscopic pore parameters were calculated by Particles (Pores) and Cracks Analysis System (PCAS) [40][41][42] and 3 SEMs from each sample. In the complex environment of sulfate erosion, the pore area, pore number, porosity, and other parameters are insufficient to fully characterize the pore evolution law.…”

Section: Effect Of Go On Pore Characteristics During Sulfatementioning

confidence: 99%

Experimental Study on Mechanism of Graphene Oxide-Modified Coral Sand Cement Mortar to Resist Sulfate Erosion

et al. 2022

View full text Add to dashboard Cite

Coral sand particles with low strength and rich pores affect the mechanical properties and durability of their cement-based materials. This paper investigates the mechanical properties and internal pore evolution of graphene oxide-modified coral sand cement mortar under sulfate erosion environment, aiming to better understand the effect of graphene oxide on the mechanical properties of coral sand cement mortar under an erosion environment, especially in wet and dry cycles. Mechanical properties of coral sand cement mortar were tested with different amounts of graphene oxide and different erosion cycles to understand the relationship between the change of flexural and compressive strength and the content and erosion cycle. The microscopic parameters of hydration products and internal dissolution pores were analyzed by XRD and SEM. The results showed that the degree of erosion performance improvement is related to the content of GO, and the two are positively correlated at first and then negatively correlated. At 0.03 wt% content, the retardation effect is the best. There were more orderly pore arrangement with less morphological complexity, when the dissolution amount of Ca(OH)2, porosity, total pore area, pore number, probability entropy, average form factor, and fractal dimension decreased. Coral sand cement mortar increases resistance to sulfate attack, which graphene oxide inhibits the formation of new dissolution pores and the expansion of original pores.

show abstract

Predicting chemical influence on soil water retention curves with models established based on pore structure evolution of compacted clay

Cited by 19 publications

References 61 publications

Modeling the Salinity Effect on the Water Retention Curve of Geosynthetic Clay Liner (GCL) on the Drying Path

Modeling the Salinity Effect on the Water Retention Curve of Geosynthetic Clay Liner (GCL) on the Drying Path

Effects of Rainfall on Mechanical Behaviors of Residual-Soil Landslide

Experimental Study on Mechanism of Graphene Oxide-Modified Coral Sand Cement Mortar to Resist Sulfate Erosion

Contact Info

Product

Resources

About