Soil water characteristic curve measurement without bulk density changes and its implications in the estimation of soil hydraulic properties

Fu, Xiaoli; Shao, Mingan; Li, Dianqing; Wang, Huimin

doi:10.1016/j.geoderma.2011.08.012

Cited by 33 publications

(12 citation statements)

References 32 publications

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“…e commonly used test methods include the pressure plate method, filter paper method, centrifuge method, and tensiometer method. e centrifuge method is widely used because of its simple operation, short time usage, and the ability to measure the SWCC under high matric suctions [1][2][3][4][5]. As a kind of soil with high clay content and a large number of hydrophilic minerals, expansive soil has a series of special properties such as strong water sensitivity, swelling, and shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Niu

Zhang

Zhao³

et al. 2021

Advances in Civil Engineering

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This paper targets the expansive soils in Heilongjiang and Ankang to explore the influence of initial dry density, dry-wet cycle, and freeze-thaw cycle on the soil-water characteristics. The centrifuge method was used to obtain the soil-water characteristic curves (SWCCs) with different conditions. The volumetric strain of SWCC was modified based on the shrinkage test, and the corresponding fitting equations considering different factors were established. The results show that the volumetric water content is modified to consider the volume shrinkage effect of expansive soil, and the modification is more obvious in the high matric suction range. The smaller the initial dry density is, the worse the water-holding capacity of the sample is, and the smaller the air intake value is. The greater the time of the dry-wet cycle is, the greater the saturated volumetric water content of the sample is, and the corresponding water-holding capacity is significantly reduced. When the dry-wet cycle increases to a certain extent, the structure becomes stable. With the increase of the freeze-thaw cycle, the saturated volumetric water content first decreases and then increases. Similarly, after several times of the freeze-thaw cycle, the structure is basically stable. The fitted Gardner model equations under different conditions were proved to be able to describe the SWCCs of the two targeted expansive soils.

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Section: Introductionmentioning

confidence: 99%

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Niu

Zhang

Zhao³

et al. 2021

Advances in Civil Engineering

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“…Analisis rembesan (seepage) membutuhkan data SWCC untuk menentukan perubahan jumlah air yang di dalam tanah untuk berbagai kondisi tanah sehingga satu parameter utama yang digunakan untuk pemodelan aliran air tanah (Fu et al 2011). Untuk mendapatkan parameter tanah jenuh sebagian seperti SWCC dan hydraulic conductivity function perlu dilakukan fitting berdasarkan informasi dasar dari properties tanah dan distribusi ukuran butiran.…”

Section: Soil Water Characteristic Curve (Swcc)unclassified

Nilai Derajat Kejenuhan Tanah Pada Penilaian Ancaman Longsor Rombakan (Debris Flow) Pada Batuan Vulkanik

2021

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Flow landslides are spatial movements that occur continuously due to the soil surface's direction usually, a short distance away, and the occurrence is not too long. The flow avalanche gradation depends on the intensity of rain, soil type, and vegetation. In contrast, the direction of mobility depends on the slope of the slope and surface soil type. Soil types that are quickly saturated due to high-intensity rain and briefly on the slopes cause the soil layer to be eroded under its weight soon into the valley. This was what makes it difficult for residents to avoid and evacuate. In this case, analysis and technical studies need to be carried out on the effect of the soil's degree of saturation, which causes the threat of landslide of the rubble. Observations were made with borehole, and geoelectric samples carried out in Abang Batu Dinding Village, Kintamani. The surface morphology is hilly, soil type at an average depth of 1-1.5 m sandy silt, and bedrock is volcanic breccia. The hydrological analysis was modeled based on the Thiessen polygon, where the average effective rainfall for 10-50 years is 238 mm/day. The negative pore water stress value increases from 35 kPa-72.44 kPa. There is still water in the soil pores that can keep the bonds of soil grains when the degree of low saturation is around 40%, and then it increases to 78.46%. In this study, the degree of saturation of 40% to 56% of the value of soil shear strength increased and then the shear strength of the soil decreased to 37.62 o with a degree of saturation of 78.46%. Rapid changes in the soil surface with minimal vegetation will cause erosion on the soil surface, in spatial conditions with a soil thickness of 1-1.5 m will cause landslides or debris.

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“…A sequence of water heads is applied via rotation and centrifugal force and water content and outflow rates are measured [10,11]. This approach has been continuously developed to eliminate practical issues like consolidation of undisturbed samples [12]. In addition, the evaporation method [13] is widely used, which allows high-resolution observation of HSP from saturation (only retention curve) to around h = −1000 cm and in an extended version up to h = −8800 cm [14].…”

Section: Introductionmentioning

confidence: 99%

Combination of Measurement Methods for a Wide-Range Description of Hydraulic Soil Properties

Weninger

Bodner

Kreiselmeier

et al. 2018

Water

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Established measurement methods for hydraulic soil properties cover a limited soil moisture range. Simulations of soil water dynamics based on such observations are therefore rarely representative for all conditions from saturation to drought. Recent technical developments facilitate efficient and cheap collecting of soil water characteristics data, but the quantitative benefit of extended measurement campaigns has not been adequately tested yet. In this study, a combination of four methods to measure water retention and hydraulic conductivity at different moisture ranges was applied. Evaporation method, dewpoint psychrometry, hood infiltrometer experiments, and falling head method for saturated conductivity were conducted at two experimental sites in eastern Austria. Effects of including the particular methods in the measurement strategy were examined by visual evaluation and a 1D-modelling sensitivity study including drainage, infiltration and drought conditions. The evaporation method was considered essential due to its broad measurement range both for water retention and hydraulic conductivity. In addition to that, the highest effect on simulated water balance components was induced by the inclusion of separate conductivity measurements near saturation. Water content after three days of drainage was 15 percent higher and the transpiration rate in a drought period was 22 percent higher without near-saturated conductivity measurements. Based on relative comparisons between different combinations, we suggested combining evaporation method and hood infiltrometer experiments as the basis for representative predictions of soil water dynamics.

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Soil water characteristic curve measurement without bulk density changes and its implications in the estimation of soil hydraulic properties

Cited by 33 publications

References 32 publications

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Nilai Derajat Kejenuhan Tanah Pada Penilaian Ancaman Longsor Rombakan (Debris Flow) Pada Batuan Vulkanik

Combination of Measurement Methods for a Wide-Range Description of Hydraulic Soil Properties

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