scholarly journals Appraisal of Bearing Capacity and Modulus of Subgrade Reaction of Refilled Soils

2020 ◽  
Vol 6 (11) ◽  
pp. 2120-2130
Author(s):  
Muhammad Usman Arshid ◽  
M. A. Kamal
Keyword(s):  
Moisture Content ◽  
Bearing Capacity ◽  
Shear Failure ◽  
Soil Samples ◽  
Engineering Properties ◽  
Subgrade Reaction ◽  
Primary Input ◽  
Modulus Of Subgrade Reaction ◽  
Relative Compaction ◽  
Allowable Bearing Capacity

Soil is remoulded, replaced, or improved in place to meet the required engineering properties. Relative compaction is the measure of the resulting engineering improvement. But design engineers need the allowable bearing capacity while the modulus of subgrade reaction is the primary input of modern foundation design software. The current research appraised a correlation between Relative Compaction ( ), Moisture Content ( ), and allowable bearing capacity ( ) and another correlation between , RC, MC, and modulus of subgrade reaction ( ). The test samples were extracted from each trial of the standard proctor test using purpose-built extraction tubes. Allowable bearing capacity has been determined by performing unconfined compression tests on the extracted tubes. The relationships have been established employing statistical analysis. It was noticed that soil samples at the lower moisture content (6-9%) show brittle failure before reaching the allowable strain. The soil samples having a moisture content of 10-14% exhibited shear failure, nearly simultaneous to the allowable strain. The soil samples having higher moisture content undergone a strain of 15% without showing the shear failure. A simple equation has also been appraised to determined Ks involving the three-input variable, i.e., , , and . Moderate correlations have been found to exist between the studied parameters, owing to some other variables' influence. Recommendations for future studies have been drawn to quantify the effect of identified parameters. Doi: 10.28991/cej-2020-03091606 Full Text: PDF

Evaluation of Lime Treated Oil Contaminated Soils for Use in Waste Containment Applications

2013 ◽  
Vol 824 ◽  
pp. 66-72
Author(s):  
Thomas Stephen Ijimdiya
Keyword(s):  
Hydraulic Conductivity ◽  
Moisture Content ◽  
Contaminated Soils ◽  
Optimum Moisture Content ◽  
Soil Samples ◽  
Liner Material ◽  
British Standard ◽  
Waste Containment ◽  
Relative Compaction ◽  
Waste Containment Systems

This paper presents the results of an evaluation of lime treated oil contaminated soil for use in waste containment systems. Soil samples were treated with up 6 % lime contents. Specimens were prepared at optimum moisture content and compacted using British Standard Light (BSL) or Standard Proctor (relative compaction = 100%) to evaluate its effectiveness when used in waste containment applications. The hydraulic conductivity values increased with higher lime contents but were less than 1 x 10-9 m/s required for a liner material.

Subgrade reaction and load-settlement characteristics of gravelly cobble deposits by plate-load tests

1998 ◽  
Vol 35 (5) ◽  
pp. 801-810 ◽  
Author(s):  
Ping-Sien Lin ◽  
Li-Wen Yang ◽  
C Hsein Juang
Keyword(s):  
Bearing Capacity ◽  
Field Tests ◽  
Load Test ◽  
Subgrade Reaction ◽  
Plate Load Test ◽  
Modulus Of Subgrade Reaction ◽  
High Rise ◽  
Undisturbed Samples ◽  
Load Tests ◽  
Mat Foundations

This paper presents the result of plate-load tests conducted on a gravelly cobble deposit in Taichung Basin, Taiwan. The geologic formation of the gravelly cobble deposit makes it very difficult to obtain large undisturbed samples for laboratory testing. These field tests provide an opportunity to examine the applicability of existing theories on bearing capacity and subgrade reaction in this geologic formation. The modulus of subgrade reaction is of particular importance in the local practice of designing high-rise buildings on mat foundations. The results of the plate-load tests on this soil deposit are analyzed and discussed.Key words: plate-load test, gravelly cobble deposit, modulus of subgrade reaction, bearing capacity.

scholarly journals Effect of Saturation Levels on Shear Strength and Bearing Capacity Properties of Soil Types

2019 ◽  
Vol 54 (6) ◽  
Author(s):  
Mahmood D. Ahmed ◽  
Alaa D. Almurshedi ◽  
Hayder H. Alwan
Keyword(s):  
Bearing Capacity ◽  
Unsaturated Soils ◽  
Soil Classification ◽  
Soil Samples ◽  
Engineering Properties ◽  
Test Results ◽  
Soil Layers ◽  
Angle Of Internal Friction ◽  
Noticeable Reduction ◽  
Properties Of Soil

This study presents a comprehensive set of laboratory works for the examined soil layers extracted from Baghdad city (specifically from Alkadhimya, Alaitaifiya, and Alhurriya) to illustrate their engineering properties. The researchers have adopted the unified soil classification system for soil classification purposes. Also, the direct shear test was performed for soil samples with various degrees of saturation (0%, 25%, 50%, 75%, and 100%). The test results have shown a significant reduction in cohesion property with higher moisture content within soil samples. Also, a noticeable reduction in angle of internal friction value has occurred with such changes. Furthermore, it has been found that the bearing capacity of unsaturated soils ranged between 2000 and 3000 KPa, and about 500-700 KPa for the soaked soil samples.

scholarly journals Rock Mass Characterization for Assessment of Safe Cut Slope and Rock Bearing Capacity at Gondang Dam Site, Karanganyar, Indonesia

2019 ◽  
Vol 4 (1) ◽  
pp. 9
Author(s):  
Sao Sochan ◽  
I Gde Budi Indrawan ◽  
Dwi Agus Kuncoro
Keyword(s):  
Rock Mass ◽  
Bearing Capacity ◽  
Research Area ◽  
Engineering Properties ◽  
Geological Strength Index ◽  
Cut Slope ◽  
Rock Mass Characterization ◽  
Rock Mass Quality ◽  
Allowable Bearing Capacity ◽  
Tuff Breccia

This paper presents results of surface rock mass characterization for assessment of safe cut slopes and allowable bearing capacity of foundation rocks at the construction area of Gondang Dam. The rock mass characterization involved determination of intact rock engineering properties and rock mass quality based on the Geological Strength Index. The rock mass characterization results showed that the research area consisted of moderately to highly weathered and very weak to weak andesite breccia and andesite tuff breccia. The andesite breccia had very poor to fair rock mass quality, while the andesite tuff breccia had poor to fair rock mass quality. The research area was divided into three zones of safe cut slope and allowable bearing capacity. Landslides occurred at natural slopes having poor to very poor rock mass quality and inclinations greater than the determined safe cut slopes.The foundation rock of the embankment dam had fair rock massquality and 135–280 T/m2 allowable bearing capacity

EVALUATION OF SOIL PHYSICAL PROPERTY AS A DETERMINING FACTOR OF EROSION: A CASE STUDY OF BEHIND NIGERIA INSTITUTE OF LEATHER AND SCIENCE TECHNOLOGY, ZARIA

2021 ◽  
Vol 5 (1) ◽  
pp. 135-139
Author(s):  
H. S. Garuba ◽  
M. K. Mukhtar ◽  
G. N. Ugama ◽  
A. Jamilu ◽  
M. K. Aliyu ◽  
...  
Keyword(s):  
Moisture Content ◽  
Soil Properties ◽  
Physical Property ◽  
Liquid Limit ◽  
Soil Samples ◽  
Engineering Properties ◽  
Soil Physical Property ◽  
Soil Sediment ◽  
Determining Factor

Soil Erosion is the detachment, transportation and deposition of soil sediment from one place to another. This has led to loss of lives and infrastructure in many parts of Nigeria. Soil properties play a role in it vulnerability and extent to erosion. This study aims to evaluate selected physical properties as they interact to cause erosion in the study area.  The study was conducted in 2012 in a gully site in relation to its potential to erodibility of gully channel. This was done by collection of various soil samples at different depth followed by laboratory analysis to determine the plastic limit, moisture content and other engineering properties. The Results indicated that the soil samples have Atterberg limit that might be considered low, while liquid limit (LL) ranged from 25 – 30, the plasticity index (PI) ranged from 1 – 5%, which suggested that the soils are slightly plastic. Moisture content was moderate. The soil properties investigated played a major role in exacerbating the gully erosion in the area, therefore, the existing culvert should be redesigned and reconstructed taking appropriate consideration of the underlying soil properties

scholarly journals Geotechnical Properties Study of Soil Bank Slopes for Shatt Al-Hilla, Middle of Iraq

2021 ◽  
Vol 54 (2F) ◽  
pp. 97-109
Author(s):  
Wael Noori Mrzah ◽  
Raid Aziz Mahmod ◽  
Amer Atia Lafta
Keyword(s):  
Soil Properties ◽  
Bearing Capacity ◽  
River Flow ◽  
Soil Samples ◽  
Natural Conditions ◽  
Engineering Construction ◽  
Allowable Bearing Capacity ◽  
Central Regions ◽  
Geotechnical Tests

The central regions of Babylon Governorate, located on the Shatt Al-Hilla, suffer from problems as the collapse and erosion of its banks, increase in sedimentation in the river, which reduces the river flow efficiency and forms meanders in the river. After the reconnaissance visit to determine the meandering sites. A detailed study of the area was carried out by drilling 6 test boreholes representing three areas (Ancient Babylon, Bata-Bridge, and Al-Khusrweya), two wells on both sides of the meander at a depth of 10m for each borehole to know soil properties, bearing capacity and consolidation, and its effect on the engineering construction. Soil samples have been taken to carry out geotechnical tests. also conducted a study of banks stability for three stations, where the cross-section was monitored by the M9 device and the height of the banks from both sides by the LEVEL device, using the Geo-Studio-2021 program with soil properties and by using Bishop method the safety factor was extracted for the three stations for erosion-prone areas. it was 3.44 in Ancient Babylon, Bata-Bridge was 1.7 and Al-Khusrweya was 1.6 Under natural conditions, the average river flow level reaches it in year respectively are 27.88, 27.74, 27.33 m, above sea level. Where all the stations were safe unless the water level increased or decreased. Also, the research reached a determination of the allowable bearing capacity reaches it before the landslide.

scholarly journals Improvement of Bearing Capacity of Clay Soil Using Fly Ash

2020 ◽  
Vol 19 (2) ◽  
pp. 55-62
Author(s):  
Abul Hasnat ◽  
Safkat Tajwar Ahmed ◽  
Tahmid Mustafa ◽  
Md. Samiullah Chowdhury ◽  
S. M. Prince
Keyword(s):  
Fly Ash ◽  
Bearing Capacity ◽  
Physical And Mechanical Properties ◽  
Ash Content ◽  
Engineering Properties ◽  
Allowable Bearing Capacity ◽  
Density Relationship ◽  
Time Required ◽  
Unsaturated Condition ◽  
Properties Of Soil

The principal aim of the study is to improve the engineering properties of the soil sample using fly ash as a binding material. Bangladeshi fly ash was used in this study. Effects of fly ash on physical and mechanical properties of soil (Atterberg limits, moisture-density relationship, and unconfined compressive strength) are evaluated in the presence of 0%, 2%, 4%, 5%, 8%, 10%, 15%, 20% & 25% fly ash. For understanding the improvement of engineering properties of soil, a parametric analysis is conducted to determine the allowable bearing capacity, settlement and the time required for the consolidation. The allowable bearing capacity is evaluated using several equations for both saturated and unsaturated conditions. It is found that for 5% fly ash content, the maximum allowable bearing capacity is achieved. The maximum value of allowable bearing capacity is 660.12 kN/m2 in the unsaturated condition. The increment of maximum allowable bearing capacity is 77.74% for 5% fly ash content. The lowest value of the settlement was 336 mm (saturated) and 183 mm (unsaturated) for 25% fly ash content. Considering normally consolidated soil, it is found that the least time required for consolidation is 3.19 years for 25% fly ash content.

scholarly journals Effect of Relative Compaction on Water Absorption and Gypsum Dissolution in Gypsum-Rich Clayey CBR Samples

2020 ◽  
Vol 7 (4) ◽  
pp. 590-604
Author(s):  
Sabah S. Razouki ◽  
Dina K. Kuttah
Keyword(s):  
Moisture Content ◽  
Water Absorption ◽  
Soil Sample ◽  
Multiple Regression ◽  
Soil Samples ◽  
Multiple Regression Equation ◽  
Average Moisture Content ◽  
Gypsum Dissolution ◽  
Gypsum Content ◽  
Relative Compaction

Abstract A clayey gypsiferous soil of CL group according to the Unified Soil Classification System was studied for the effect of relative compaction on water absorption and gypsum dissolution during long-term soaking. The soil has a gypsum content of about 33%. Two sets of soil samples were prepared at optimum moisture content of 11.75% of the modified Proctor compaction test. The first set received 100%, while the second received about 93.5% relative compaction with respect to modified Proctor. These samples were soaked for 4, 7, 15, 30, and 120 days under 40 lbs (178 N) surcharge load. The moisture content was determined at top, quarter points, midpoint, and bottom of each soil sample. The test results revealed that for each compaction effort, the moisture content along each soaked soil sample is not uniform and increased with increasing soaking period. This increase in moisture content is greater for soil samples compacted at the lower compaction effort. The moisture content at top of each soil sample is greater than at the bottom, and the least moisture content took place at the middle of the sample. The dissolution of gypsum, at the top of soil samples, was greater than that at the middle. A multiple regression equation was developed relating strongly the decrease in gypsum content along the clayey CBR samples, with compaction effort and increase in average moisture content along the samples due to soaking. Similarly, strong correlation was obtained from the multiple regression developed between absorbed water, soaking period, and compaction effort. The paper shows that the water absorption and gypsum dissolution decrease with increasing relative compaction as the soil becomes denser.

scholarly journals A feasibility study on calcareous soil stabilization using polymers in Barka region.

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
S.V. Satyanarayana ◽  
Mohammed Al Jahwari
Keyword(s):  
Moisture Content ◽  
Bearing Capacity ◽  
Calcareous Soil ◽  
Soil Stabilization ◽  
Synthetic Polymer ◽  
Optimum Moisture Content ◽  
Soil Samples ◽  
Dry Density ◽  
Maximum Dry Density ◽  
Atterberg Limit

In the Gulf region most of the soils require soil stabilization to increase soil bearing capacity for construction of safe and sustainable buildings. The soils are stabilized either by physical stabilization, chemical stabilization or by mechanical stabilization. The aim of this project is to stabilize calcareous soil in the Barka region with synthetic polymers. The soil samples from the Barka region collected by using standard soil sampling methods. The synthetic polymer was mixed with the calcareous soil in 1%, 3% and 5%. The soil samples were tested for sieve analysis, Atterberg Limit, Particle Density, Proctor test and California Bearing Ratio test before and after addition of synthetic polymer. It was observed that there is a positive impact on the geotechnical properties of soil with the addition of Polymer. The optimum moisture content of the soil reduced and the maximum dry density of the soil increased. The optimum results were found at 5% addition of polymer where the optimum moisture content was found out to be 12.6% and the maximum dry density was found out to be 1.997 Mg/m3. The Atterberg limit test to show that the plasticity index of the soil reduced with the addition of polymer and the optimum results were found out at 5% addition of polymer. Finally, the CBR test results determine that the soil bearing capacity increases with the addition of Polymer. After the addition of 5% Polymer, the CBR value was found out to be 27.465% compared to 14.19% for the fresh calcareous soil. The results are encouraging. Keywords: Atterberg Limit, Calcareous soil, CBR, polymer, stabilization.

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