The Use of Filter-Paper and Suction-Plate Methods for Determining the Soil-Water Characteristic Curve of Undisturbed Colluvium Soils

Suits, L David; Sheahan, TC; Feuerharmel, C; Gehling, Wai Ying Yuk; Bica, Adriano Virgílio Damiani

doi:10.1520/gtj14004

Cited by 24 publications

(3 citation statements)

References 14 publications

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“…Results showed a great variation of suction pressures over a small range of soil water contents, due to the greater retention capacity of the soil. SWRC with similar behavior to the soil used in this research were obtained by Feuerharmel et al (2006) and Portelinha & Zornberg (2017) for compacted fine lateritic soils.…”

Section: Experimental Programme 21 Materials and Samples Preparationmentioning

confidence: 52%

Reinforcing effect of recycled polypropylene fibers on a clayey lateritic soil in different compaction degrees

Correia¹,

Rocha²

2021

S&R

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The present research investigates the reinforcing effect of recycled polypropylene (R-PP) fibers on a compacted clayey lateritic soil in different compaction degrees. R-PP fibers of 12 mm length were mixed with the soil in the contents of 0.1 and 0.25% of soil dry weight. Unconfined compression strength tests (UCS), direct shear tests and indirect tensile strength (ITS) tests were conducted. Fibers addition showed no significate alterations in the optimum compaction parameters. The study evidenced increases in UCS, changing the soil behavior from a brittle failure to a ductile failure, while fiber contribution was most effective for 0.25% R-PP fibers content and 95% compaction degree. The use of fibers improved the shear stress-strain behavior of the composites and soils compacted at different degrees of compaction showed similar shear behavior, which is coherent to the soil water retention curves (SWRC) results. Significant increases in the tensile behavior of soil-mixtures for both fiber contents used were observed, and fibers increase was more significate than increase in soil degree of compaction. The stretching of the fibers and fibers orientation at the sheared interface in direct shear tests and the fiber “bridge” effect in ITS tests could be observed.

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Section: Experimental Programme 21 Materials and Samples Preparationmentioning

confidence: 52%

Reinforcing effect of recycled polypropylene fibers on a clayey lateritic soil in different compaction degrees

Correia¹,

Rocha²

2021

S&R

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“…Therefore, Gardner [41] proposed the filter paper method to determine the matrix suction of soil, which was adopted by the American Society of Materials and Tests (ASTM), with relevant standards. Moreover, Feuerharmel found that the filter paper method had high accuracy in determining the suction by comparing it with other matrix suction methods [42]. Since then, the filter paper method has been introduced into the field of geotechnical engineering and applied widely [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Degrees of Hydrophobic Treatment on Soil–Water Characteristic Curves and Infiltration Coefficients of Hygroscopic Soils

Zhou

Chen

et al. 2022

Coatings

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Soil treated with silicone hydrophobic material for a long time can effectively improve the saturated permeability of the ground, which has been confirmed. However, the long time will increase the cost in engineering construction. Secondly, the mechanism of alteration of soil–water properties by silicone hydrophobic materials is not understood. This lack of understanding is not conducive to the engineering application of silicone hydrophobic materials. Therefore, variable-head permeability and matrix suction tests under 15 different test conditions were conducted with different hydrophobic material dosage and action time as variables in this paper. The soil–water characteristic curve (SWCC) was plotted according to the test results, the unsaturated permeability coefficient was calculated, and curve fitting was performed. It can be seen from the test data that, with the increase in the dosage of hydrophobic materials and the action time, the permeability coefficient and the air-entry value showed a downward trend. Nevertheless, as the reaction proceeded, a mutation occurred at 4 h. When the minimum dosage and action time were used, the soil’s permeability coefficient and air-entry value decreased by 80.65% and 71.09%. The test results show that, even when the action time was 2 h, the hydrophobic material could maintain the permeability of the soil and reduce its air-entry value; thus, the hydrophobic material could effectively reduce the rise of capillary water in the soil and protect the roadbed.

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“…Given the air-entry value limitation of ceramic disk, the maximum suction imposed in PPM is generally 500 kPa or 1,500 kPa ( 8 ). FPM can cover the suction range of 5–3,000 kPa and the maximum suction measured by VEM can reach 368 MPa ( 6, 8–10 ). Therefore, the combination of different measurement techniques is usually adopted in SWCC tests ( 8 , 9 , 11 ).…”

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confidence: 99%

Laboratory Study on Entire Range Suction Measurement and Microstructure Change of Granite Residual Soil

Ling

Lin

et al. 2023

Transportation Research Record: Journal of the Transportation R

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The shear strength of unsaturated granite residual soil (GRS) will decline rapidly when moisture content increases, because of loss of matric suction in the soil. This can lead to slope instability and embankment collapse during rainfall. Determining the matric suction of GRS accurately at different conditions can improve the accuracy of stability analysis. Generally, matric suction can be characterized as the soil–water characteristic curve (SWCC), and it is closely related to soil microstructure. In this study, the entire range of matric suction was measured using a combination of pressure plate method, filter paper method, and vapor equilibrium method. Microstructure change was investigated based on mercury intrusion porosimeter tests, in which the pore size distribution (PSD) curves of GRS samples with different initial densities and moisture content were measured. The PSDs of samples before and after wetting were also measured and compared to investigate the influence of water intrusion. Test results indicate that the combination of measurement methods can cover the entire matric suction range. The microstructure of GRS with different initial conditions presents a clear bimodal PSD. At the same density, the increase in initial moisture content can increase intra-aggregate pores and decrease inter-aggregate pores. When initial density increases, only the volume of inter-aggregate pores decreases. Wetting can decrease inter-aggregate pores and increase intra-aggregate pores. Finally, the Li model is applied in SWCC fitting for tested samples, the result of which performs well with a high correlation coefficient (R2 > 0.95) and is recommended for GRS analysis.

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The Use of Filter-Paper and Suction-Plate Methods for Determining the Soil-Water Characteristic Curve of Undisturbed Colluvium Soils

Cited by 24 publications

References 14 publications

Reinforcing effect of recycled polypropylene fibers on a clayey lateritic soil in different compaction degrees

Reinforcing effect of recycled polypropylene fibers on a clayey lateritic soil in different compaction degrees

Effects of Different Degrees of Hydrophobic Treatment on Soil–Water Characteristic Curves and Infiltration Coefficients of Hygroscopic Soils

Laboratory Study on Entire Range Suction Measurement and Microstructure Change of Granite Residual Soil

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