Use of osmotic tensiometers in the determination of soil-water characteristic curves

Liu, Hengshuo; Rahardjo, H.; Satyanaga, Alfrendo; Hejun, D.

doi:10.1016/j.enggeo.2022.106938

Cited by 7 publications

(10 citation statements)

References 23 publications

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“…In order to solve the cavitation issue and get a wider measurement range, there are two basic approaches [24]. The first technique is to create a high capacity tensiometer (HCT) by breaking air bubbles or nuclear particles in water by applying high pressure to the water in the tensiometer's chamber.…”

Section: Introductionmentioning

confidence: 99%

“…This makes it possible to measure a high matric suction because air bubbles will not form while taking the measurement if water is under high tension. Other scientists have reported measuring a high matric suction of 7 MPa [24]. To provide a wide measurement range, HCTs need high-air-entry-value ceramics or nanoporous glass.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it has been demonstrated that the cavitation issue would arise during the measurement. As a result, such a tensiometer might not be appropriate for long duration matric suction to monitor [24].…”

Section: Introductionmentioning

confidence: 99%

“…Its measurement range is same as the osmotic pressure of water inside its polymer chamber. Water with a positive osmotic pressure will not get tense inside the OT's measurement range, preventing the cavitation issue [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…The matric suction of the soil can cause a decrease in the osmotic pressure of the water in the polymer compartment of the osmotic tensiometer during the measurement; this decrease is matric suction of the soil's value. Polymers that absorb water, such as sodium polyacrylate (NaPA), polyvinyl pyrrolidone (PVP), polyacrylamide (PAM) and polyethylene glycol (PEG), are typically employed for this purpose [24].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation on the Effect of Infiltration and Evapotranspiration on the Residual Slope

et al. 2023

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Soil suction plays an important role in governing the stability of slopes. Environmental sustainability could be jeopardized by hazards, such as slope failures (forest destruction, landscape alteration, etc.). However, the quantification of the suction effect on slope stability is a challenging task as the soil suction is usually affected by the precipitation and evapotranspiration. Numerical simulation plays an important role in the estimation of contour in soil suction due to rainfall and evapotranspiration as long-term and widespread monitoring is rarely conducted. The result of numerical simulation is highly dependent on the accuracy of the input parameters. Hence, suction monitoring plays an important role in verifying the result of numerical simulation. However, as a conventional tensiometer is limited to 100 kPa soil suction, it is hard to verify the performance of numerical simulation where suction is higher than 100 kPa. The osmotic tensiometer developed by Nanyang Technological University (NTU) can overcome this problem. It is now possible to monitor changes in soil suction higher than 100 kPa (up to 2500 kPa) for an extended period in the field. In this study, a procedure was proposed to estimate suction changes in residual soil based on rainfall and evapotranspiration data. Numerical simulation was carried out based on the soil properties and geometry of a residual soil slope from Jurong Formation Singapore. Changes in soil suction due to rainfall and evaporation were simulated and compared with the readings from the NTU osmotic tensiometers installed at 0.15 m and 0.50 m from the slope surface in the field. It was observed that numerical simulation was able to capture the variations of suctions accurately at greater depths. However, at shallow depths, erratic suction changes due to difficulties in capturing transpiration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation on the Effect of Infiltration and Evapotranspiration on the Residual Slope

et al. 2023

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A framework for estimating the matric suction in unsaturated soils using multiple artificial intelligence techniques

Wang,

Vanapalli

2024

Num Anal Meth Geomechanics

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Implementation of the state‐of‐the‐art understanding of the mechanics of unsaturated soils into geotechnical engineering practice is partly limited due to the lack of quick, reliable, and economical techniques for matric suction measurement. Matric suction is one of the key stress state variables that significantly influences the hydro‐mechanical behavior of unsaturated soils. In this paper, to address this objective, two artificial intelligence (AI) models were developed for estimating matric suction in unsaturated soils based on the particle swarm optimization support vector regression (PSO‐SVR) and multivariate adaptive regression spline (MARS) algorithms. The results suggest that both these models can reasonably estimate matric suction. Compared to the MARS model, the PSO‐SVR model can achieve higher accuracy. Nonetheless, the MARS model facilitates the sensitivity analysis and the selection of essential inputs. A novel integrated framework is proposed and validated, leveraging the strengths, and alleviating the limitations of the PSO‐SVR and MARS algorithms for reliable and rapid estimation of matric suction in the range of 0–1500 kPa for low plastic soils (0 < Ip ≤ 7). Six inputs are required to use this model successfully; some can be measured using conventional laboratory tests, and others can be calculated from mass‐volume relationships.

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Influence of Suction on Mass Loss of Compacted Clayey Soil from the Guabirotuba Formation in Southern Brazil

Britto,

Silva Costa,

Muñoz

et al. 2024

Geotech Geol Eng

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Use of osmotic tensiometers in the determination of soil-water characteristic curves

Cited by 7 publications

References 23 publications

Numerical Simulation on the Effect of Infiltration and Evapotranspiration on the Residual Slope

Numerical Simulation on the Effect of Infiltration and Evapotranspiration on the Residual Slope

A framework for estimating the matric suction in unsaturated soils using multiple artificial intelligence techniques

Influence of Suction on Mass Loss of Compacted Clayey Soil from the Guabirotuba Formation in Southern Brazil

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