Microstructural Interpretation of Water Content and Dry Density Influence on the DC-Electrical Resistivity of a Fine-Grained Soil

2011 ◽  
Vol 34 (6) ◽  
pp. 103763
Author(s):  
L. D. Suits ◽  
T. C. Sheahan ◽  
Yves-Laurent Beck ◽  
Sérgio Palma Lopes ◽  
Valéry Ferber ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Water Content ◽  
Dry Density ◽  
Dc Electrical Resistivity ◽  
Fine Grained ◽  
Fine Grained Soil

Characterizing Riverbed Heterogeneity across Shifts in River Discharge through Temporal Changes in Electrical Resistivity

2020 ◽  
Vol 25 (4) ◽  
pp. 581-587
Author(s):  
Weston J. Koehn ◽  
Stacey E. Tucker-Kulesza ◽  
David R. Steward
Keyword(s):  
Electrical Resistivity ◽  
Temporal Changes ◽  
Coarse Grained ◽  
Arkansas River ◽  
Alluvial Deposits ◽  
Fine Grained ◽  
Surrounding Matrix ◽  
Aquifer Depletion ◽  
Fine Grained Soil ◽  
The Individual

The fluxes between groundwater and surface water play a significant role in quantifying water balance along stream reaches to continent scales. Changes in these dynamics are occurring due to aquifer depletion, where pre-development baseflow conditions have transitioned to losing conditions. This problem is studied along the Arkansas River in Western Kansas across a stream reach that transitions from near steady state to losing conditions, and contributes focused recharge to a depleting Ogallala Aquifer. Existing hydrologic data illustrates the lack of understanding they provide related to the control of fluxes exerted by alluvial deposits. Electrical resistivity imaging (ERI) surveys were conducted along this river transect to elucidate the dynamic hydrologic connection existing between the Arkansas River and underlying Arkansas Alluvial and Ogallala Aquifers. Temporal changes in ERI profiles are associated with the transient hydrologic conditions below the water-sediment interface, and complement the hydrogeologic interpretations of the individual ERI profiles. Additionally, fine grained soil inclusions may become revealed by temporal changes in resistivity due to differences in their water holding capacity relative to that of a surrounding matrix of coarser grained soil across changes in recharge. These findings corroborate the role of river-aquifer connectivity and riverbed heterogeneity on localized recharge through embedded assemblages of fine and coarse grained soils.

scholarly journals Measurement of Degree of Compaction of Fine-Grained Soil Subgrade Using Light Dynamic Penetrometer

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Junhui Zhang ◽  
Yongsheng Yao ◽  
Jianlong Zheng ◽  
Xiangqun Huang ◽  
Tian Lan
Keyword(s):  
Water Content ◽  
Field Tests ◽  
Prediction Equation ◽  
Liquid Limit ◽  
Fine Grained ◽  
Penetration Ratio ◽  
Good Consistency ◽  
Fine Grained Soil ◽  
Measured Water ◽  
Water Contents

To determine the degree of compaction of subgrades filled with fine-grained soil, the compaction test and light dynamic penetrometer (LDP) test were carried out for low liquid-limit clay samples with different water contents in laboratory. Then, a prediction equation of the penetration ratio (PR) defined as the depth per drop of the hammer of LDP, degree of compaction (K), and water content (ω) was built. After that, the existing fine-grained soil subgrades on LDP-based field tests were excavated. The on-site PR values, water contents, and degrees of compaction of slopes were obtained. The estimated degrees of compaction using the prediction equation were compared with measured values of the degree of compaction in field. The results show that there is good consistency between them, and an error within 3.5% was obtained. In addition, the water content should be determined firstly while using the prediction equation which is proposed in this study. Therefore, a numerical method of the water content of a subgrade was developed, and the predicted and measured water contents were compared, which shows a relatively high relativity. Then, the degree of compaction of fine-grained soil subgrades can be calculated according to the predicting equation, which involves the penetration ratio (PR) and the numerically calculated water content as input instead of the measured value in the field.

Electrical resistivity of frozen and petroleum-contaminated fine-grained soil

2001 ◽  
Vol 32 (2-3) ◽  
pp. 107-119 ◽  
Author(s):  
Allan J. Delaney ◽  
Paige R. Peapples ◽  
Steven A. Arcone
Keyword(s):  
Electrical Resistivity ◽  
Fine Grained ◽  
Fine Grained Soil

scholarly journals Freezing–Thawing Behavior of Lime Treated Fine–grained Soil

2018 ◽  
Vol 7 (4) ◽  
pp. 75
Author(s):  
Abdulrahman Aldaood ◽  
Amina Khalil ◽  
Marwen Bouasker ◽  
Muzahim Al-Mukhtar
Keyword(s):  
Compressive Strength ◽  
Water Content ◽  
Unconfined Compressive Strength ◽  
Soil Samples ◽  
Treated Soil ◽  
Freeze Thaw ◽  
Fine Grained ◽  
Mineralogical Properties ◽  
Fine Grained Soil ◽  
The Impact

This research study was carried out to investigate the impact of freeze-thaw cycles on the mechanical and the mineralogical properties of lime treated fine-grained soil. The unconfined compressive strength, wave velocity, volume change, water content, pH and electrical conductivity values were determined during freeze-thaw cycles. Furthermore, Mercury porosimetry and X-ray diffraction tests were carry out to determine changes at microscopic level. The soil used in this study was taken at a site near Jossigny region in eastern part of Paris–France. The soil samples were treated with optimum lime percent 3% depending on the pH method, then cured for 28 days at 20 °C. The soil samples were subjected to 12 cycles of freeze-thaw following ASTM procedure.    The result referred that, natural soil exhibit no strength resistance against freeze-thaw cycles and failed during the first hours of freeze-thaw cycles. Analyses indicated that freeze-thaw cycles reduce the unconfined compressive strength of all the tested samples. Moreover, water content during the applied cycles increases and induces significant volume changes. During freeze-thaw cycles, the cracks propagation which caused by the formation of ice lenses in the pores of lime treated soil samples were consider to have significant. The changes in the micro-structural and mineralogical properties reduce the durability  of the lime treated soil samples when subjected to freeze-thaw cycles.

scholarly journals Permeability of the Mixture of Fine Grained Soil and Fly Ash from Fluidized Bed Combustion

2017 ◽  
Vol 17 (2) ◽  
pp. 25-30
Author(s):  
Karolina Knapik ◽  
Joanna Bzówka
Keyword(s):  
Fly Ash ◽  
Water Content ◽  
Fluidized Bed ◽  
Initial Water Content ◽  
Curing Time ◽  
Fluidized Bed Combustion ◽  
Initial Water ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Fbc Fly Ash

Abstract Based on known correlations permeability was calculated for the mixtures containing various proportions of selected FBC fly ash, Speswhite kaolin and lime. The influence of initial water content of the mixtures was also considered. The study was limited to the first four weeks of curing time. Results of calculations were discussed on the background of previously obtained observations for mixtures of tested materials.

Field Test Study on Frost-Heave of Subgrade in Seasonal Frozen Region along Haerbin-Dalian Passenger Dedicate Line

2013 ◽  
Vol 671-674 ◽  
pp. 45-49 ◽  
Author(s):  
Jin Fang Hou ◽  
Yong Li Wang ◽  
Jun Feng
Keyword(s):  
Soil Temperature ◽  
Water Content ◽  
Field Test ◽  
Frost Heave ◽  
Soil Pressure ◽  
Construction Technique ◽  
Effective Measure ◽  
Fine Grained ◽  
Environment Temperature ◽  
Fine Grained Soil

The new constructing railway Haerbin-Dalian Dedicate Line runs through the typical seasonal frozen region. For the purpose of estimating the quality of subgrade construction, a field test was played. Placed the monitoring instrument and measure the soil temperature, settlement and soil pressure etc.. The monitoring data shows that the change of soil temperature is less than the environment temperature. The maximum frost depth is 1.66m. In this depth, the fine-grained soil with high frost-heave characteristic should not be as the subgrade. The effective measure to prevent the rain percolated through the subgrade is important. And the filling of subgrade should be constructed strictly according to the maximal degree of compaction and keep the best water content. The settlement of subgrade is less than 15mm, the water content is also less than the prime frost-heave water content and the frost-heave force is very small. Thus, the construction technique subgrade is feasible.

Experimental Study on Compaction and Strength Characteristic of Wetland Fine Grained Soil

2012 ◽  
Vol 256-259 ◽  
pp. 336-339
Author(s):  
Hong Xia Yang
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Optimum Moisture Content ◽  
Dry Density ◽  
High Moisture ◽  
Compacted Soil ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Work Effect

Through indoor the compaction test and unconfined compressive strength of compacted soil samples and CBR strength test, analyzes compaction characteristics of wetland fine grained soil and the change rule of compacted strength with compaction work and moisture content.The results show that under the same compaction work effect, when the soil moisture content is less than optimum moisture content,along with the increase of moisture content, dry density increases, when the soil moisture content is greater than the optimum moisture content, along with the increase of moisture content, dry density decreases and to a larger extent.When the compaction work is bigger, the soil dry density is bigger, the compaction strength is higher and the optimum moisture content is smaller.Strength decreases when under high moisture content condition, CBR value is relatively stable in the wet side of optimum moisture content.

Dielectric permittivity of fine-grained fractions of soil samples from eastern Spain at 200 MHz

Geophysics ◽  
2010 ◽  
Vol 75 (1) ◽  
pp. J1-J9 ◽  
Author(s):  
Christina Salat ◽  
Andreas Junge
Keyword(s):  
Dielectric Permittivity ◽  
Water Content ◽  
Laboratory Data ◽  
Clay Fraction ◽  
Soil Samples ◽  
Small Scale ◽  
Carbonate Content ◽  
Dry Density ◽  
High Attenuation ◽  
Fine Grained

To provide a database for interpreting GPR field data by means of small-scale laboratory studies, we have determined the real and imaginary parts of the dielectric permittivity of fine-grained fractions of soil samples from eastern Spain in the laboratory. We use the parallel-plate method in combination with an impedance analyzer and focus on the frequency of [Formula: see text]. The measurements are compared to physical properties such as volumetric water content, dry density, clay fraction, and carbonate content. The results show the well-known increase in dielectric permittivity with increasing water content, as presented in the literature; however, our values are systematically higher. This deviation may be caused by the exceptionally high carbonate content of the samples. We establish a basic relationship between dielectric permittivity and water content that is characteristic for soils in the research area. In addition to the dominating influence of water on permittivity, we find a correlation with dry density as well, which is linear for dry samples. Finally, we calculate the attenuation coefficients and find high attenuation for samples with high clay fraction, even at low water contents. A 1D model of the permittivity distribution is constructed from borehole data (water content and layer thickness) coincident with a GPR profile and from the laboratory data. The modeled GPR trace explains the observation and thus connects laboratory measurements to GPR data.

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