Visualization technique for liquefaction process in chamber experiments by using electrical resistivity monitoring

Jinguuji, Motoharu; Toprak, Selçuk; Kunimatsu, Sunao

doi:10.1016/j.soildyn.2006.08.004

Cited by 23 publications

(11 citation statements)

References 2 publications

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“…Quartz-rich Toyoura sand from Yamaguchi, Japan, is a standard natural sand sample commonly used in geotechnical research (e.g., Jinguuji et al, 2007;Minagawa et al, 2008 Nakashima and Watanabe, 2002). The bead grains were packed into the identical cylindrical tube (inner diameter, 56 mm) made of polypropylene to yield a bead pack porosity of 36 vol.%.…”

Section: Methodsmentioning

confidence: 99%

The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments

Nakashima¹

2013

Journal of Hydrology and Hydromechanics

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Iodine is conventionally used as a contrast agent in hydrological laboratory experiments using polychromatic X-ray computed tomography (CT) to monitor two-phase Darcy flow in porous geological media. Undesirable beam hardening artifacts, however, render the quantitative analysis of the obtained CT images difficult. CT imaging of porous sand/bead packs saturated with iodine and tungsten-bearing aqueous solutions, respectively, was performed using a medical CT scanner. We found that sodium polytungstate (Na 6 H 2 W 12 O 40 ) significantly reduced the beam hardening compared with potassium iodide (KI). This result is attributable to the location of the K absorption edge of tungsten, which is nearer to the peak of the polychromatic X-ray source spectrum than that of iodine. As sodium polytungstate is chemically stable and less toxic than other heavy element bearing compounds, we recommend it as a promising contrast agent for hydrological CT experiments.

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Section: Methodsmentioning

confidence: 99%

The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments

Nakashima¹

2013

Journal of Hydrology and Hydromechanics

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“…In the last few years, the ERT has been increasingly applied to study active faults (Galli et al, 2006(Galli et al, , 2014Improta et al, 2010;Giocoli et al, 2011), volcanic areas (Finizzola et al, 2010Siniscalchi et al, 2010), landslides (Perrone et al, 2004), geological and structural setting of sedimentary basins (Giocoli et al, 2008), local seismic response (Boncio et al, 2011;Mucciarelli et al, 2011;Moscatelli et al, 2012), etc. Only in very few cases was the ERT method applied in laboratory experiments in order to study liquefaction phenomenon during and after the shaking (Jinguuji et al, 2007).…”

Section: Electrical Resistivity Tomographymentioning

confidence: 99%

Electrical resistivity tomography for studying liquefaction induced by the May 2012 Emilia-Romagna earthquake (Mw = 6.1, northern Italy)

Giocoli

Quadrio

Bellanova

et al. 2014

Nat. Hazards Earth Syst. Sci.

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Abstract. This work shows the result of an electrical resistivity tomography (ERT) survey carried out for imaging and characterizing the shallow subsurface affected by the coseismic effects of the Mw = 6.1 Emilia-Romagna (northern Italy) earthquake that occurred on 20 May 2012. The most characteristic coseismic effects were ground failure, lateral spreading and liquefaction that occurred extensively along the paleo-Reno River in the urban areas of San Carlo and Mirabello (southwestern portion of Ferrara Province). In total, six electrical resistivity tomographies were performed and calibrated with surface geological surveys, exploratory boreholes and aerial photo interpretations. This was one of first applications of the electrical resistivity tomography method in investigating coseismic liquefaction.

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“…As one of the natural characteristic indices, electrical resistivity is not only a requirement for geological prospecting but also an important indicator for soil mechanical properties (Bryson & Bathe, 2009;Chu et al, 2017;Samouelian et al, 2005). Since the electrical resistivity technique was introduced to measure the engineering properties of geomaterials (Rømoen & Lecomte, 2012), with decades of development, electrical properties have been widely used in evaluating geotechnical parameters (Zha et al, 2009;Cai et al, 2012;Revil et al, 2014), detecting contaminated soil layers (Brillante et al, 2015;Fukue et al, 2001), estimating the result of foundation soil treatment (Kalinski & Kelly, 1994;Zhang et al, 2012), evaluating sand liquefaction (Jinguuji et al, 2007;Jones et al, 2011), and evaluating soil salinity in agriculture (Corwin & Lesch, 2005).…”

Section: Introductionmentioning

confidence: 99%

Electrical Resistivity of Freezing Clay: Experimental Study and Theoretical Model

Feng

Chen

2020

JGR Earth Surface

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Electrical resistivity of soil has become one of the most important indicators of compactness and compressive resistance. In previous studies, the temperature of soil tested was always above 0 °C. However, due to the phase change of pore water, the resistivity of freezing soils is different from that of unfrozen soils. Therefore, it is necessary to clarify the influence of temperature on electrical resistivity. To achieve this goal, according to the bundle of the cylindrical capillary model, pores in soil were treated as conducting tubes, and two simple lognormal functions were introduced to describe the distribution of the conducting tubes. Based on the conductivity theory, a new model considering the temperature and the pore size distribution was presented. Results show that only a part of the conducting tubes can be treated as the effective conducting tubes, which are determined by the soil temperature. Furthermore, a small portion of the pores with the smaller size controlled the electrical resistivity of the freezing clay. In other words, the change in the electrical resistivity of freezing clay was caused mainly by the change of unfrozen water content through the decrease in temperature. Based on the experimental results conducted on clay from Northeast China, the validity of the presented model was verified. The comparison results indicate that there was a good agreement between the calculated results and the experimental results. To expand the scope of the model, more laboratory tests are suggested to conduct to verify the applicability of the model to other clays.

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Visualization technique for liquefaction process in chamber experiments by using electrical resistivity monitoring

Cited by 23 publications

References 2 publications

The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments

The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments

Electrical resistivity tomography for studying liquefaction induced by the May 2012 Emilia-Romagna earthquake (Mw = 6.1, northern Italy)

Electrical Resistivity of Freezing Clay: Experimental Study and Theoretical Model

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