Investigation of Salt, Alum Content in Soft Soils and Their Effects on Soil Properties: Case Study in Coastal Areas of Vietnam

Nu, Nguyen Thi; Duong, Nguyen Thanh; Son, Bui Truong; Thinh, Phi Hong

doi:10.46717/igj.53.2a.2rw-2020-08-02

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…The parameters a of the three kinds of soft soil are taken as 0.8 by comprehensive comparison to unify the equation and facilitate the calculation. The parameters are put into the equation of the Hydropower Sciences, the Coson-Kamen permeability coefficient, and the empirical equation of the Terzaghi, and the permeability coefficient of each soil sample is calculated [19,20].…”

Section: Equations Of Modified Permeability Coefficientsmentioning

confidence: 99%

Analysis of the Microstructure and Macroscopic Fluid-Dynamics Behavior of Soft Soil after Seepage Consolidation

Jin¹,

Zhou²,

Zhu³

2022

Fluid Dynamics &Amp; Materials Processing

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The purpose is to study the microstructure and macroscopic fluid-dynamic behavior of soft soil after it has been subjected to a seepage consolidation procedure. First, the microscopic pore structure of soft clay is quantitatively studied by a scanning electron microscope technique. Second, the average contact area rate of soil particles is obtained employing statistical analysis applied to microscopic images of soft soil, and the macroscopic porosity of soft clay is determined through an indoor geotechnical test. Finally, mathematical relationships are introduced by fitting the results of the test. The results show that the unmodified empirical equation for the permeability coefficient of coarse-grained soil produces large errors in calculations related to cohesive soils. By contrast, the permeability coefficient calculated by the empirical equation modified by the average contact area ratio theory is in good agreement with the measured average value of the indoor test.

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Section: Equations Of Modified Permeability Coefficientsmentioning

confidence: 99%

Analysis of the Microstructure and Macroscopic Fluid-Dynamics Behavior of Soft Soil after Seepage Consolidation

Jin¹,

Zhou²,

Zhu³

2022

Fluid Dynamics &Amp; Materials Processing

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“…Many features of the aquifer, which may include groundwater flow paths, lithology, and anthropogenic activity such as pumping affect seawater intrusion (Muhammad and Husam, 2011). Furthermore, as sea levels increase, seawater can percolate through groundwater, causing seawater to migrate to land, resulting in a change in the quality of groundwater resources (Nu et al, 2020). The seawater, which is slightly denser, initially invades the bottom of the aquifer and the freshwater present at the surface, as the coastal aquifers are normally hydraulically related to the sea.…”

Section: Introductionmentioning

confidence: 99%

Geochemical Approach for Seawater Intrusion Assessment in the Area around Yogyakarta International Airport, Indonesia

Zamroni

2021

IGJ

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A total of 10 groundwater samples were obtained from groundwater wells with depths of around 8-10 meters distributed around Yogyakarta International Airport, Indonesia to test the geochemical of groundwater for assessing the seawater intrusion. Samples were taken into polyethylene bottles with a volume of 1000 ml. These bottles were rinsed to reduce the risk of any contamination prior to their filing with sampled water. Piper Diagram is used to evaluate seawater intrusion by plotting the percentages of cations and anions (in mEq/L) as a single point on the triangle. The groundwater facies' in the study area are CaHCO3 and CaNaHCO3. It suggests that the origins of the elements Ca and Na were estimated to derive from the dissolution of the plagioclase, hornblende, and pyroxene minerals found in the sand sediment, while the elements of HCO3 were estimated from the dissolution of carbonate minerals or the decomposition of organic matter and root respiration in the soil zone may enrich their concentration. The wells affected by slightly freshening were ZAM-04, ZAM-05, ZAM-06, ZAM-08, and ZAM-10. While the wells that are not affected by the intrusion or fresh were ZAM-01, ZAM-03, ZAM-07, and ZAM-09. However, ZAM-02 well which is close to the coastline and the closest to the airport development area was the only well that affected significantly by freshening, comparing with other wells. Another expected controlling factor was the fault in the northern part which continuously leads that location. By supported a flow pattern or large river, it was concluded the alluvial deposits buried the fault, and it was estimated to continue to that location.

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“…Any engineering site needs an extensive investigation of the site soil gypsum layers to decide whether the soil is suitable to the proposed project or not, (Al-Mamoori, 2017). Thi Nu et al, 2020 mentioned that the increase in salt content in soft soil causes a decrease in undrained shear strength and an increase in compression index, liquid limit of soft soil. Resistivity methods, especially 2D and 3D electrical resistivity imaging (ERI) techniques are very useful in this situation.…”

Section: Introductionmentioning

confidence: 99%

Detected of Gypsum Soil Layer by Using 2d and 3d Electrical Resistivity Imaging Techniques in University of Anbar, Iraq

Abdulrazzaq

Al-Zubedi²,

Abed

2020

IGJ

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The 2D electrical resistivity imaging survey was implemented in the area located within the University of Anbar, using a dipole-dipole array to detect the gypsum soil layer. This survey was done along seven analogous 2D lines adjacency in E-W direction, then the data of all 2D lines were merged to produce 3D resistivity imaging models. Laboratory tests of three soil samples in the survey area were analyzed and correlated with data obtained from 2D imaging to determine gypsum content in the soil. Our results of 2D and 3D imaging models show that the gypsum soil layer thickness is 2.53 m approximately, and it is characterized by high differences in the resistivity values in the range of 50 to more than 400 Ωm. This difference is generally caused by high inhomogeneities in the hardness of soil components, while the test results show the gypsum content in the samples equal to 213, 232, and 211 g/kg respectively, and it is indicative of that the soil consists of a high content of gypsum. The correlation between these results is indicative of the area is unstable and can be led to a differential settlement that causes cracks and collapses of the constructions.

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Investigation of Salt, Alum Content in Soft Soils and Their Effects on Soil Properties: Case Study in Coastal Areas of Vietnam

Cited by 11 publications

References 16 publications

Analysis of the Microstructure and Macroscopic Fluid-Dynamics Behavior of Soft Soil after Seepage Consolidation

Analysis of the Microstructure and Macroscopic Fluid-Dynamics Behavior of Soft Soil after Seepage Consolidation

Geochemical Approach for Seawater Intrusion Assessment in the Area around Yogyakarta International Airport, Indonesia

Detected of Gypsum Soil Layer by Using 2d and 3d Electrical Resistivity Imaging Techniques in University of Anbar, Iraq

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