Collapse Potential and Permeability of Undisturbed and Remolded Loessial Soil Samples

2012 ◽  
pp. 301-308 ◽  
Author(s):  
S. Mohsen Haeri ◽  
Atefeh Zamani ◽  
A. Akbari Garakani
Keyword(s):  
Soil Samples ◽  
Loessial Soil ◽  
Collapse Potential

scholarly journals Clay-organic complexes in a Polish loess soil

2017 ◽  
Vol 31 (3) ◽  
pp. 447-452 ◽  
Author(s):  
Ewa A. Czyż ◽  
Jerzy Rejman ◽  
Anthony R. Dexter ◽  
Jan Jadczyszyn ◽  
Anna Rafalska-Przysucha ◽  
...  
Keyword(s):  
Loess Soil ◽  
Soil Samples ◽  
Mass Ratio ◽  
Loessial Soil ◽  
Soil Physical Quality ◽  
Organic Complexes ◽  
Carbon Mass ◽  
Predicted Values ◽  
Strip Tillage ◽  
Range Of Values

AbstractComplexes formed between clay and soil organic matter are important for carbon sequestration and for soil physical quality. Here, we use samples of loessial soil from South-East Poland to explore the phenomenon of complexing in loess. Soil samples were collected from a single catchment 8 years after the introduction of strip tillage and their compositions were characterized by traditional methods. Complexing was characterized in terms of the content of non-complexed clay which was estimated in two ways: firstly, by measurement of the content of readily-dispersible clay (which was assumed to be the non-complexed clay); and secondly, by calculation using algorithms that had been developed and evaluated previously. The calculations were based on the concept that, at carbon saturation, the clay/organic carbon mass ratio is equal ton. The calculations were done with a range of values ofn. It was assumed that the correct value ofnwas that which gave the greatest coefficient of correlation between the measured values of clay dispersion and the predicted values of non-complexed clay. For the loess used, the optimum value wasn= 14.

scholarly journals Study of the Effect of Waste Glass Fibers Incorporation on the Collapsible Soil Stability Behavior

2020 ◽  
Author(s):  
Nassima Bakir ◽  
Khelifa Abbeche ◽  
Gérard Panczer ◽  
Larbi Belagraa
Keyword(s):  
Glass Fibers ◽  
Treatment Method ◽  
Soil Samples ◽  
Arid Zones ◽  
Optimal Dosage ◽  
Collapsible Soil ◽  
Foundation Soil ◽  
Collapse Potential ◽  
Key Factor ◽  
The Stability

Soil collapse remains a major issue affecting structural foundations, particularly in arid and semi-arid zones where humidification is a key factor contributing to the collapse. Much research has been devoted to identifying treatment methods which enhance the stability and load-bearing capacity of this type of soil. This paper investigates the potential advantages of the addition of milled glass fibers (Fg ). Soil samples were prepared at different compaction energies and various water contents, then treated with different percentages of milled glass fiber, before being submitted to the simple consolidation odometer test. The results obtained in this study showed that soil samples treated with an optimal dosage of 6% of milled glass fibers compacted at 60 blows and humidified at 6% of moisture content. This represents an improvement in the stability of the soil, reducing the collapse potential (Cp) from 11.95% to 1.62%. This treatment method produces soil which can be classified as a moderate risk foundation soil according to the Jennings and Knight evaluation metrics (1975). Keywords: collapsible soils, arid zones, fiberglass, odometer test.

Collapsibility and Shear Strength of Gypseous Soil Improved by Nano Silica Fume (NSF)

2020 ◽  
Vol 857 ◽  
pp. 292-301
Author(s):  
Alaa D. Al-Murshedi ◽  
Mahdi O. Karkush ◽  
Hussein H. Karim
Keyword(s):  
Shear Strength ◽  
Silica Fume ◽  
Dry Mass ◽  
Soil Samples ◽  
Nano Silica ◽  
Collapse Potential ◽  
Geotechnical Characteristics ◽  
Before And After ◽  
Problematic Soils ◽  
Gypseous Soil

The problematic soils have complex and irregular behavior such as gypseous soils, which concentrated mainly in the dry and semi-dry regions in the world. In Iraq, the gypseous soils cover about 30 to 35% of its total area in the west desert and extended to the southern parts of Iraq. The gypseous soils experience sudden collapse upon wetting. The present paper focuses on studying the effects of nano silica fume (NSF) on the collapsibility and shear strength of gypseous soil before and after soaking. Also, this study, the influence of NSF on the chemical and physical characteristics of gypseous soil have been investigated. A gypseous soil sample obtained from Al-Najaf Sea has gypsum content of 42%. The gypseous soil samples are mixed with three percentages of nano silica fume (1, 2, and 4) % calculated as ratio of the dry mass of soil to measure their influence on the geotechnical characteristics of soil samples. The collapse potential of gypseous soil is reduced with increasing the content of nano silica fume. Also, increasing the content of NSF and curing time resulted in increasing the shear strength of soil samples.

scholarly journals DETERMINATION OF THE COLLAPSE POTENTIAL OF SABKHA SOIL AND DUNE SAND ARID SURFACE SOIL DEPOSITS IN KUWAIT

2021 ◽  
Vol 83 (3) ◽  
pp. 93-100
Author(s):  
Fahad A. Al-otaibi ◽  
Humoud Melfi Aldaihani
Keyword(s):  
Surface Soil ◽  
Soil Samples ◽  
Experimental Program ◽  
Natural Soil ◽  
Dune Sand ◽  
Collapse Potential ◽  
Potential Index ◽  
Soil Deposits ◽  
Dry Conditions ◽  
Strength And Stiffness

Ensuring the sustainability of critical and limited natural soil resources is a major challenge in arid regions such as Kuwait. Investigations should be performed to identify and characterise collapsible surface soil deposits, and collapse potential should be assessed if possible in order to evaluate suitable stabilizing techniques. The cementation effect of different types of salts gives arid soils their considerable strength and stiffness in dry conditions. The collapse in these soils may occur due to the reduction of the chemical or physical bonds between the soil particles under wet conditions. Collapse Potential (CP) is an indication of the collapsibility of these soils. This paper presents the results of experimental work that was carried out to evaluate the collapse potential of two types of surface soil: sabkha soil and dune sand. The experimental program included physical and chemical soil characterization alongside a modified compaction test. The collapsibility of the soil at a stress of 200 kPa was obtained by performing a Single Collapse Test (SCT) via a conventional odometer device in a temperature- and humidity-controlled environment. Collapse potential index tests were performed on the tested soil samples collected from eight locations in two study areas. The results suggest the problem severity is slight to none. However, the CP was higher for the sabkha soil samples than for the dune sand samples. The increase in collapsibility of the sabkha soil samples may be attributed to the removal of bonding between cementing particles upon wetting.

Collapse Potential of Oil-Contaminated Loessial Soil (Case Study: Golestan, Iran)

2019 ◽  
Vol 38 (1) ◽  
pp. 255-264
Author(s):  
Saber Nokande ◽  
Mohammad Ali Khodabandeh ◽  
Seyed Sadegh Hosseini ◽  
Seyed Mahdi Hosseini
Keyword(s):  
Loessial Soil ◽  
Collapse Potential

K-MEANS CLUSTERING ALGORITHM BASED CLASSIFICATION OF SOIL FERTILITY IN NORTH WEST NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 780-787
Author(s):  
Ibrahim Hassan Hayatu ◽  
Abdullahi Mohammed ◽  
Barroon Ahmad Isma’eel ◽  
Sahabi Yusuf Ali
Keyword(s):  
Soil Fertility ◽  
Crop Yield ◽  
Clustering Algorithm ◽  
Soil Samples ◽  
North West ◽  
R Programming ◽  
Available Information ◽  
Northwest Region ◽  
The Relationship

Soil fertility determines a plant's development process that guarantees food sufficiency and the security of lives and properties through bumper harvests. The fertility of soil varies according to regions, thereby determining the type of crops to be planted. However, there is no repository or any source of information about the fertility of the soil in any region in Nigeria especially the Northwest of the country. The only available information is soil samples with their attributes which gives little or no information to the average farmer. This has affected crop yield in all the regions, more particularly the Northwest region, thus resulting in lower food production.  Therefore, this study is aimed at classifying soil data based on their fertility in the Northwest region of Nigeria using R programming. Data were obtained from the department of soil science from Ahmadu Bello University, Zaria. The data contain 400 soil samples containing 13 attributes. The relationship between soil attributes was observed based on the data. K-means clustering algorithm was employed in analyzing soil fertility clusters. Four clusters were identified with cluster 1 having the highest fertility, followed by 2 and the fertility decreases with an increasing number of clusters. The identification of the most fertile clusters will guide farmers on where best to concentrate on when planting their crops in order to improve productivity and crop yield.

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

Sign in / Sign up

Export Citation Format

Share Document