Electrical resistivity variation in uniaxial rock compression

Bungaya Kangin Village, Bebandem District, Karangasem Regency, Bali Province consists of paddy fields and settlements, required therefore a water source / aquifer that can meet all these needs. One of the Geophysical Methods that can identify the aquifer is the Geoelectric Method. Geoelectric method used in this research is Resistivity Method. Data acquisition using Vertical Electrical Sounding (VES) and Electrical Resistivity Tomography (ERT) Methods. VES method is a method of measurement to determine the variation of resistivity vertically at one point. Electrical Resistivity Tomography (ERT) method is a method of measuring resistivity on soil surface / rock by using many electrode (51 electrode), to obtain sub-surface resistivity variation lateraly and verticaly, to obtain sub-surface image. The equipment used for geoelectric measurements is Resistivity Meter of Naniura NRD 300 Hf which has been equipped with a switchbox to adjust the displacement of 51 electrodes. Based on the resistivity modeling results, the aquifers in the study area were found in rough sandstones with resistivity values : (49 - 100) Ohm.m.

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Electrical resistivity variation connected to volcanic earthquake in the Campi Flegrei, Italy

10.5194/egusphere-egu2020-18692 ◽

2020 ◽

Author(s):

daniela tarallo ◽

Giuseppe Cavuoto ◽

Vincenzo Di Fiore ◽

Nicola Pelosi ◽

Michele Punzo ◽

...

Keyword(s):

Electrical Resistivity ◽

Earthquake Swarm ◽

Fluid Pressure ◽

Source Area ◽

Campi Flegrei ◽

Present Observation ◽

Volcanic Earthquake ◽

Resistivity Variation ◽

Pressurized Fluids ◽

Fluid Pressurization

In this study we show an 2D Electrical Resistivity Tomography (ERT) survey acquired in Agnano site pre (Dec 5th, 2019) and post (Dec 12th, 2019) earthquake events occurred in Pisciarelli-Solfatara areas. This earthquake swarm consisted of sequence of 34 earthquakes with Magnitude (Md) -1.1&#8804;Md&#8804;2.8 at depths between 0.9 and 2.3 km. In particular, the earthquake of Dec 06th, 2019 at 00:17 UTC with Md = 2.8 (depth 2 km) was the maximum recorded event since bradyseismic crisis began in 2005.The ERT survey allow us to identify the main structural boundaries (and their associated fluid circulations) defining the shallow architecture of the Agnano volcano. The hydrothermal system is identified by very low values of the electrical resistivity (<20 &#937; m). Its downwards extension is clearly limited by the lava and pyroclastic fragments, which are relatively resistive (>100 &#937; m). The resistivity values are increased after the main shock. This increase in resistivity may have been caused by a change in the state of stress and a decrease in pore pressure (subsequent depressurization). Previously to the earthquake, an increase in pressurized fluids has been observed which have reduced the resistivity values. The present observation suggests that the temporal variation of the resistivity values is related to the variation of the pore fluid pressure in the source area of the swarm, facilitated by earthquake and the subsequent fluid diffusion. The combination of these qualitative results with structural analysis leads to a synthetic model of magmatic and hydrothermal fluids circulation inside the Agnano area, which may be useful for the assessment of potential hazards associated with a renewal of fluid pressurization, and a possibly associated partial flank-failure.

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About electrical resistivity variation during drying and improvement of the sensing behavior of carbon fiber-reinforced smart concrete

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.120699 ◽

2020 ◽

Vol 264 ◽

pp. 120699

Author(s):

Hamza Allam ◽

François Duplan ◽

Jean-Pierre Clerc ◽

Sofiane Amziane ◽

Yves Burtschell

Keyword(s):

Electrical Resistivity ◽

Carbon Fiber ◽

Fiber Reinforced ◽

Resistivity Variation ◽

Carbon Fiber Reinforced ◽

Smart Concrete

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Study of ac and dc electrical resistivity variation with high pressure of as-grown pure, indium and antimony doped SnS single crystals

Physica Scripta ◽

10.1088/1402-4896/ab30cd ◽

2019 ◽

Vol 94 (10) ◽

pp. 105706

Author(s):

Mahesh D Chaudhary ◽

Sunil H Chaki ◽

M P Deshpande

Keyword(s):

High Pressure ◽

Electrical Resistivity ◽

Single Crystals ◽

Dc Electrical Resistivity ◽

Pure Indium ◽

Resistivity Variation

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Assessing a fractured landfill cover using electrical resistivity and seismic refraction techniques

Geophysics ◽

10.1190/1.1443001 ◽

1991 ◽

Vol 56 (11) ◽

pp. 1896-1904 ◽

Cited By ~ 35

Author(s):

P. J. Carpenter ◽

S. F. Calkin ◽

R. S. Kaufmann

Keyword(s):

Electrical Resistivity ◽

Seismic Refraction ◽

Seismic Energy ◽

P Wave ◽

Velocity Inversion ◽

Landfill Cover ◽

Geophysical Surveys ◽

Resistivity Variation ◽

Cover Thickness ◽

Azimuthal Resistivity

Fracturing or erosion of landfill cover materials may lead to escape of landfill gases and creation of leachate through infiltration of surface water. Periodic geophysical surveys could be used to assess landfill covers noninvasively and identify fractured or thinned areas. Models derived from electrical resistivity and seismic refraction measurements were evaluated over various portions of a closed municipal landfill in west surburban Chicago. Resistivity soundings could not delineate cover thickness over areas of fractured or new cover where resistivity contrasts with the underlying refuse were minor. Cover thickness estimates accurate to within 0.7 m, however, were obtained over unfractured mature cover where resistivities were 10–20 ohm‐m higher than in the refuse. Azimuthal resistivity variations as large as 16 ohm‐m indicate opening of cover fractures during dry weather; these same areas showed little or no azimuthal resistivity variation under moist conditions. Strong absorption of seismic energy and a velocity inversion in the refuse prevented calculation of cover thickness from seismic refraction profiles using a sledgehammer source. However, higher direct P-wave velocities (740 m/s) characterized areas of intact cover and lower velocities (370 m/s) characterized highly fractured cover. Qp for cover materials ranged from 3 to 9 and did not differ between fractured and unfractured areas.

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SOIL ELECTRICAL RESISTIVITY MAPPING IN THE FORMOSA CITY LANDFILL, GOIÁS STATE, BRAZIL

Brazilian Journal of Geophysics ◽

10.22564/rbgf.v33i2.718 ◽

2015 ◽

Vol 33 (2) ◽

Cited By ~ 1

Author(s):

Wllyane Silva Figueiredo ◽

Carlos Tadeu Carvalho Do Nascimento

Keyword(s):

Electrical Resistivity ◽

Surface Water ◽

Water Runoff ◽

Average Increase ◽

Central Brazil ◽

Geophysical Surveys ◽

Survey Line ◽

Resistivity Variation ◽

Surface Water Runoff ◽

Soil Electrical Resistivity

ABSTRACT. The purpose of this work was to study the surroundings of a landfill in the Formosa city, Goi´as state, central Brazil, with respect to the values of the soil electrical resistivity. In the study area, two geophysical surveys were conducted, respectively in 2012 January and May. These studies were executed in the northwest edge of the landfill, which has smaller altimetry and therefore is the preferred site for effluents migration. The resistivity variation in the study area between the two data acquisition periods showed an average increase of approximately 47% in the value of this property in the transition from the rainy to the dry season. Independent of variation derived from the seasonal aspects of precipitation, there were observed areas with high and low resistivity along the survey line and whose positions are the same in both periods. The reasons for the occurrence of these areas are related to surface water runoff, which transports material in solution from landfill, including nearby roads, to its slope.Keywords: geophysical survey, effluent migration, surface water runoff. RESUMO. O objetivo deste trabalho foi estudar o entorno do Aterro Sanitário de Formosa, estado de Goiás, Brasil, mais especificamente sua borda noroeste, no que diz respeito aos valores da resistividade elétrica do solo. Na área de estudo foram realizados dois levantamentos geofísicos, respectivamente em janeiro e maio de 2012. Estes levantamentos foram executados na região noroeste do aterro, a qual apresenta as menores cotas e, portanto, é o local preferencial para migração de efluentes. A variação da resistividade na área de estudo entre os dois períodos de aquisição de dados mostrou que em média ocorreu um aumento de aproximadamente 47% no valor desta propriedade na passagem da estação chuvosa para a de seca. Independente da variação derivada dos aspectos sazonais de precipitação observaram-se, nos períodos de levantamento, áreas com alta e baixa resistividade ao longo da linha de aquisição de dados e cujas posições são coincidentes nos dois períodos. A justificativa para a ocorrência destas zonas está vinculada ao escoamento superficial de água, a qual, ao escoar na área do aterro, inclusive pelas estradas ali existentes, transporta material em solução que tende a se acumular no seu talude.Palavras-chave: levantamentos geofísicos, migração de efluente, escoamento superficial.

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Volumetric Assessment of Leachate from Solid Waste Using 2D and 3D Electrical Resistivity Imaging

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.3014 ◽

2013 ◽

Vol 726-731 ◽

pp. 3014-3022 ◽

Cited By ~ 3

Author(s):

Abdullahi Abdulrahman ◽

Mohd Nordin Mohd Nawawi ◽

Rosli Saad ◽

Kola Abdul Nafiu Adiat

Keyword(s):

Electrical Resistivity ◽

Solid Waste ◽

Effective Porosity ◽

Volume Estimation ◽

Electrical Resistivity Imaging ◽

Resistivity Imaging ◽

Volumetric Assessment ◽

Resistivity Variation ◽

2D And 3D

This paper presents an approach to estimate volume of leachate from municipal solid waste using 2D and 3D electrical resistivity imaging. This process is a deviation from Water Balance Method (WBM) that is commonly used for leachate quantification at landfill sites. While the WBM emphasis is on generating rate, this geophysical approach estimates the in-situ total quantity of leachate. Five 100m profiles were used to generate five 2D inverted pseudo-sections and a 3D inverted section using RES2DINV and RES3DINV programs respectively. The resistivity of inverted pseudo-sections clearly delineated the contaminant leachate plume (ρ < 5 Ωm), which facilitated its volume estimation. The effective porosity values of clay (0.15) and sand/gravel (0.28) deduced from lithology logs were used in calculating the imaged volume of the leachate. To confirm the measured resistivity variation in the saturated subsurface around the dumpsite, in-situ electrical conductivity values of 1782 μS/cm and 4521 μS/cm were determined for uncontaminated and contaminated zones respectively. A total leachate volume of 2.21 x 103 was estimated for the 1600 survey area.

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Influence of Impurities and Microstructure on the Resistivity of LPCVD Titanium Nitride Films

MRS Proceedings ◽

10.1557/proc-168-199 ◽

1989 ◽

Vol 168 ◽

Cited By ~ 5

Author(s):

M. J. Buiting ◽

A. H. Reader

Keyword(s):

Electrical Resistivity ◽

Titanium Nitride ◽

Elemental Composition ◽

Impurity Content ◽

Chlorine Content ◽

Tin Films ◽

Resistivity Variation ◽

The Difference ◽

Influence Of Impurities

AbstractThe electrical resistivity of LPCVD TiN films deposited at temperatures between 450 and 700°C has been found to vary from about 900 to 150 μ Ωcm. The elemental composition (Ti:N), impurity content and the microstructure of the films have been investigated in order to explain the resistivity variation. It appears that this variation is directly related to the chlorine (impurity) content of the films. Films deposited at 700°C have both the lowest chlorine content and the lowest value of resistivity. Additionally the difference between the resistivity of this latter film and the (lower) value for bulk TiN is discussed.

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