Suction measurements on a natural unsaturated soil

Muñoz-Castelblanco, José; Pereira, Jean‐Michel; Delage, Pierre; Cui, Yu-Jun

doi:10.1201/b10526-110

Cited by 11 publications

(12 citation statements)

References 4 publications

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“…In Fig. 2, the water retention curve of an intact loess from northern France obtained using various experimental techniques [4,5] is plotted and compared to the intrusion curve obtained from mercury intrusion porosimetry (MIP), the latter being estimated assuming purely capillary effects [3]. The MIP curve, which corresponds to a drying branch, has been adjusted to match the water content at the saturated state (assuming that mercury intrusion catches all large pores within the material).…”

Section: Fig 2 Water Retention Curve Of Intact Loess From Northernmentioning

confidence: 99%

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Effects of microstructure on THM behaviour of geomaterials

Pereira¹

2023

E3S Web of Conf.

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In this paper, we discuss the thermo-hydro-mechanical behaviour of geomaterials at the light of their microstructure and its changes induced by multiphysics loading. After recalling the strong links between the microstructure and the water retention properties of unsaturated soils, the relation between themicrostructure and the physical properties ruling heat and mass transfers are discussed. The mechanical behaviour of unsaturated soils is then discussed focussing on the definition of an effective stress based on a microstructure description. The experimental determination of this microstructurally-based effective stressis presented, including recent advances to identify the stress coefficient from Mercury Intrusion Porosimetry data. Opening remarks towards macroscopic modelling of unsaturated geomaterials accounting for their microstructure and its changes is finally discussed.

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Section: Fig 2 Water Retention Curve Of Intact Loess From Northernmentioning

confidence: 99%

“…Indeed, in small pores, the fraction of water bonded to the solid surfaces will remain quasi-immobile and thus does not participate in the liquid flow. This observation often leads to the definition of an effective degree of saturation : 𝑆 2 " = * " +* ",$%& ,+* ",$%& (4) where 𝑆 ",%.! is the residual degree of saturation.…”

Section: Introductionmentioning

confidence: 99%

Effects of microstructure on THM behaviour of geomaterials

Pereira¹

2023

E3S Web of Conf.

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“…This curve gives suction for each saturation degree. To obtain this curve we used the filter paper technique [9,10,11]. Normalised Whatman 42 filter papers were used.…”

Section: Study Of Cnr Siltmentioning

confidence: 99%

Optimisation of in-situ dry density estimation

Morvan

Breul

2016

E3S Web Conf.

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Abstract. Nowadays, field experiments are mostly used to determine the resistance and settlements of a soil before building. The needed devices were heavy so they cannot be used in every situation. It is the reason why Gourves et al (1998) developed a light dynamic penetrometer called Panda. For this penetrometer, a standardized hammer has to be blown on the head of the piston. For each blow, it measures the driving energy as well as the driving depth of the cone into the soil. The obtained penetrogram gives us the cone resistance variation with depth. For homogeneous soils, three parameters can determined: the critical depth zc, the initial cone resistance qd0 and the cone resistance in depth qd1. In parallel to the improvement of this apparatus, some researches were lead to obtain a relationship between the dry density of soil and the cone resistance in depth qd1. Knowing dry density of soil can allow to evaluate compaction efficiency for example. To achieve this point, a database of soils was initiated. Each of these soils was tested and classified using laboratory tests, among others, grain size distribution, proctor results, Atterberg limits. Penetrometer tests were also performed for three to five densities and for three to five water contents. Using this database, Chaigneau managed to obtain a logarithmic relation linking qd1 and dry density. But this relation varies with the water content. This article presents our recent researches on a mean to obtain a unified relation using water content, saturation degree or suction. To achieve this point, at first we studied the CNR silt responses with saturation degree and water content. Its water retention curve was realised using filter paper method so we can obtain suction. Then we verified the conclusion of this study to seven soils of the database to validate our hypotheses.

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“…The filter paper used in this research is Whatman filter paper No. 42 [1] - [5]. Research from [2] using the filter paper method.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Soil Suction with Filter Paper Test Method

Sutejo

Saggaff

Rahayu

et al. 2018

Int. J. Adv. Sci. Eng. Inf. Technol.

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Soil suction is the ability of the soil to absorb water. Type of soil in this research was peat soil and clay soil. The soil samples had been used were taken from Village III Banyu Urip, Banyuasin Regency, South Sumatera Province. Laboratory testing with Filter Paper test method. The filter paper used is Whatman Filter Paper No.42. The Scanning Electron Microscope (SEM) had been used to analyze the orientation of fiber content. Energy Dispersive Spectroscopy (EDS) also to analyze the chemical elements. Characteristics of peat soil are water content value (ω) is 294.30 %, acidity (pH) value is 3.000, and peat soils classified as fibrous peat soils. While the characteristics of clay soil are water content value is (ω) 62.05 %, acidity (pH) value is 5.000, and clay soils classified as A-7-5 (AASHTO) and OH (organic clay) based on USCS. The result of the test paper filter test on peat soil obtained from the value of suction is (Ψ) 3.2432 kPa-17.5230 kPa. The results of testing the Filter Paper test method on the clay obtained the value of suction is (Ψ) 61.8733 kPa-100.3421 kPa. The value of suction from clay soil is more than a value of suction peat soil based on Filter Paper test method.

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Suction measurements on a natural unsaturated soil

Cited by 11 publications

References 4 publications

Effects of microstructure on THM behaviour of geomaterials

Effects of microstructure on THM behaviour of geomaterials

Optimisation of in-situ dry density estimation

Characteristics of Soil Suction with Filter Paper Test Method

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