On-sample water content measurement for a complete local monitoring in triaxial testing of unsaturated soils

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

doi:10.1680/geot.10.p.129

Cited by 24 publications

(13 citation statements)

References 41 publications

(30 reference statements)

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“…The semiconductor chip most be compensated against temperature and changes in the DC voltage supply. Studies conducted with Hall Effect transducer includes: Clayton et al (1989), Tatsuoka et al (1990), Ng and Wang (2001), Ng et al (2009), Clayton (2011), Muñoz-Castelblanco et al (2012, and Wu et al (2014). (Brown and Snaith, 1974); (b) Fixed support type (Costa Filho, 1985); (c) Water submersible LVDT (Cuccovillo and Coop, 1997) Difficulties in alignment of Hall Effect transducers on a triaxial soil specimen, rotation of lower pad in some cases while conducting triaxial test, are the limitations of Hall Effect transducer.…”

Section: Hall Effect Transducermentioning

confidence: 99%

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Isah¹,

Civil²,

Mohamad³

et al. 2018

Int. j. adv. appl. sci.

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Accurate determination of soil stiffness at small strain (0.001 % -0.1 % strain) is very important as it portrayed the stiffness of soil underneath geotechnical structures. To evaluate stiffness at small strain, it is important to achieve a minimum strain measurement accuracy of 10-4 %, this is attained using transducers, strain gauges and sensors which are attached on the specimen locally inside the triaxial cell. Several local strains measuring techniques have emerged with the intention of developing a seamless system which is easy, accurate and less expensive. This study epitomizes the existing types of small strain measuring instrumentation, their trend of development and technology. Those that can measure both axial and radial strain, axial strain alone and radial strain alone are distinguished and described. Also, the accuracy, features, merits, and demerits of each type of device have been discussed accordingly. This paper provides information that enables selection of a suitable device that will best fit a particular application. It is anticipated that the study will inspire further researches in the area.

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Section: Hall Effect Transducermentioning

confidence: 99%

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Isah¹,

Civil²,

Mohamad³

et al. 2018

Int. j. adv. appl. sci.

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“…In the laboratory, a new electrical probe has been designed to monitor SWC changes in a triaxial apparatus [13]. This probe is composed of four circular electrodes (1.5 mm diameters) disposed in a square-grid scheme (inter-electrode distances of 6 mm) as presented in Figure 2.…”

Section: Multi-functional Devicesmentioning

confidence: 99%

“…Figure 2. In-house constructed resistivity probe (the four electrodes are separated by distances of 6 mm) (from [13]). This electrical probe is associated with a specific holding system to ensure a good electrical contact with the triaxial specimen.…”

Section: Multi-functional Devicesmentioning

confidence: 99%

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Indirect determination of soil water content

Cosenza

2016

E3S Web Conf.

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Abstract. This manuscript reviews the recent developments in indirect methods used to measure soil watent content (SWC). It focuses on three types of methodological approaches: (i) high-frequency electromagnetic methodologies (dielectric methods and Ground Penetrating Radar), (ii) low-frequency electromagnetic methods (resistivity method and spectral induced polarization-SIP) and (iii) emerging methods (laboratory and ground-based nuclear magnetic resonance-NMR techniques and methods based on fiber optic temperature sensing systems). For each method the physical principles and the corresponding methodology are briefly described first, followed by the recent methodological advances. These recent advances address the following issues: (a) integration of different types of sensors to design new multi-functional devices, (b) miniaturization of low-cost and easily-installed electromagnetic sensors, (c) fusion and assimilation of data acquired from multiple modalities with different sampling rates and spatial resolutions, (d) physical understanding of spectra and distributed parameters measured by SIP and NMR methods, (e) improvement of geophysical inversion techniques combined with fast data acquisitions (4D monitoring of SWC).

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“…Indeed, in the case of northern line (ParisLille), a subgrade of loess is involved. Under the effects of rainfall and dynamic loading, track instability problems were identified, leading to an extensive study to identify the main instability mechanisms (collapse upon wetting, fatigue under large number of loading cycles and liquefaction in the saturated sate) [1][2][3][4][5][6]. In the case of Mediterranean Line (Paris -Marseille), a subgrade of marl was encountered and its swelling due to the coupled effect of water infiltration and excavation-related unloading was revealed to be one of the main mechanisms for the significant track heave identified [7].…”

Section: Introductionmentioning

confidence: 99%

Unsaturated railway track-bed materials

Cui

2016

E3S Web Conf.

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Abstract. Railway track-bed materials are mostly in unsaturated state, and their hydro-mechanical properties depend strongly on their water contents or suctions. In France, problematic soils such as collapsible loess and swelling marl can be origin of instability problems for new lines for high speed trains, while the hydro-mechanical behaviour of interlayer soil formed mainly by interpenetration of ballast and subgrade soil is of concern for conventional lines. In the latter case, the main challenge relies in the large variability of the interlayer soils owing to the variability of natural subgrade soils involved in the railway network. In this paper, a study on interlayer soils is presented, that covers a large spectrum of aspects: geotechnical/geophysical site characterisation, laboratory investigation into the hydraulic behaviour and mechanical behaviour as well as the mud pumping/interlayer creation phenomena, and field monitoring. The combined effect of water content and fines content were emphasized in the laboratory investigation, whilst interaction between atmosphere and track was focused on in the field monitoring. The results show clearly that it is of paramount importance to consider the unsaturated aspect of track-bed materials when analysing the overall behaviour of tracks, in particular when clay is involved in fine fraction.

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On-sample water content measurement for a complete local monitoring in triaxial testing of unsaturated soils

Cited by 24 publications

References 41 publications

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Indirect determination of soil water content

Unsaturated railway track-bed materials

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