scholarly journals Development of Single-Phase Microbial Cementation Method and to Investigate its Efficacy on Bearing Capacity, UCS, and Permeability of Sandy Soils

2021 ◽  
Vol 53 (6) ◽  
pp. 210602
Author(s):  
Prakash Bhaskarrao Kulkarni ◽  
Pravin Dinkar Nemade ◽  
Ranjit Chavan ◽  
Manoj Pandurang Wagh
Keyword(s):  
Bearing Capacity ◽  
Single Phase ◽  
Load Test ◽  
Effective Diameter ◽  
Bacillus Pasteurii ◽  
Plate Load Test ◽  
Bearing Plate ◽  
Three Samples ◽  
Fold Reduction ◽  
Collaborative Knowledge

Microbially induced calcite precipitation (MICP) is a method based on collaborative knowledge of microbiology, chemistry and geotechnical engineering. The objective of this study was to investigate the increase of the bearing capacity and the unconfined compressive strength (UCS) as well as the reduction of the permeability of sandy soil using MICP. Experiments were carried out using Bacillus Pasteurii, on three different types of sand. The admixture of bacterial culture and cementation (BCC) solution all-in-one with sand by single-phase injection was applied to induce cementation. Three samples of the selected sand were treated with varied concentrations of BCC solution, ranging from 0.05 to 0.2 L/kg, with a curing period of 3, 7 and 14 days. The test results indicated an enhancement of 55% in UCS for sand treated with a BCC content of 0.05 to 0.2 L/Kg and a reduction of 40% in permeability for untreated sand with an effective diameter of 0.5 mm treated with 0.2 L/kg of BCC solution after 14 days of curing. The results of a plate load test (PLT) on MICP treated sand showed an increase in the ultimate bearing capacity (qu) by about 2.95 to 5.8 times and a 1.7 to 3.31-fold reduction in settlement corresponding to the same load applied on untreated footing. Further investigation of the size and shape of the bearing plate on bearing capacity and settlement was carried out through a plate load test. The higher and more favorable results shown by a rectangular plate compared to a circular plate indicate that the first is preferable.

scholarly journals Prediction of Effects of Geogrid Reinforced Granular Fill on the Behaviour of Static Liquefaction

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
A. Hemalatha ◽  
N. Mahendran ◽  
G. Ganesh Prabhu
Keyword(s):  
Bearing Capacity ◽  
Load Test ◽  
Test Results ◽  
Plate Load Test ◽  
Large Size ◽  
Static Liquefaction ◽  
Granular Fill ◽  
Size Dimension ◽  
Subgrade Modulus ◽  
Different Thickness

The experimental investigation on the effects of granular fill and geogrid reinforced granular fill on the behaviour of the static liquefaction potential of the subsoil is reported in this study. A series of plate load test were carried out with different thickness of the granular fill, number of geogrid layers, and size/dimension of the footing. The test results were presented in terms of bearing capacity and subgrade modulus for the settlement ofδ10,δ15, andδ20. The experimental results revealed that the introduction of granular fill significantly increases the bearing capacity and effectively control the settlement behaviour of the footing. The introduction of geogrid in granular fill enhanced the Percentage of Control in Settlement and Bearing Capacity Ratio by a maximum of 328.54% and 203.41%, respectively. The introduction of geogrid in granular fill interrupts the failure zone of the granular fill and enhances the subgrade modulus of the footing by a maximum of 255.55%; in addition subgrade modulus of the footing was increased with an increase in the number of geogrid layers. Based on the test results it is suggested that the footing with large size has beneficial improvement on the reinforced granular fill.

Evaluation of soil bearing capacity by plate load test

2017 ◽  
pp. 767-772
Author(s):  
Qasim Al-Obaidi ◽  
Ali Al-Shamoosi ◽  
Azad Ahmed
Keyword(s):  
Bearing Capacity ◽  
Load Test ◽  
Plate Load Test

scholarly journals Ultimate Bearing Capacity of Stabilized Soil in Pavements

2020 ◽  
Vol 9 (5) ◽  
pp. 2349-2351
Keyword(s):  
Fly Ash ◽  
Bearing Capacity ◽  
Coal Ash ◽  
Ultimate Bearing Capacity ◽  
Load Test ◽  
Base Layer ◽  
Plate Load Test ◽  
Rubber Powder ◽  
Stone Dust ◽  
Stabilized Soil

This paper discusses the Ultimate Bearing Capacity of a stabilized soil by using the fly ash, stone dust and rubber powder for design of a pavement. This paper will help in utilization of locally available waste materials to reuse in the subbase and subgrade layers of pavement. Rubber powder is a waste byproduct generated from the recycling of tires, and is not so easy for degradable, and hence leads to release of harmful gases when it tends to burn. Stone dust is a locally available waste generated product from quarries. The generation of stone dust is increasing day to day in large quantity. The huge quantity of stone dust storage amount will affect the quality of soil. Fly ash is waste combusted coal ash powder generated from the steamers of coal boilers with the burning of fuel gases together. In the sub grade layer the soil is mixed in different proportions with stone dust for hard foundation. In the sub base layer the soil is stabilized with the combination of rubber powder and fly ash. When the rubber powder and fly ash, mixed with water for compaction generates a bond between the soil particles to settle the air fields. In this paper various percentages of rubber powder, stone dust and fly ash with different samples for pavement is layered, and after that plate load test is conducted upon it.

scholarly journals Pavement Subgrade Stabilization with Lime and Cellular Confinement System

2018 ◽  
Vol 13 (2) ◽  
pp. 87-93
Author(s):  
Muhammet Vefa Akpinar ◽  
Erhan Burak Pancar ◽  
Eren Şengül ◽  
Hakan Aslan
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Clayey Soil ◽  
Dry Weight ◽  
Hydrated Lime ◽  
Load Test ◽  
Lime Stabilization ◽  
Plate Load Test ◽  
Reaction Coefficient ◽  
Geocell Reinforcement

In this study effectiveness of lime stabilization and geocell reinforcement techniques of roads was investigated for low bearing capacity subgrades. For this purpose, a large-scale plate load test was designed and used. Clayey soil with high moisture content was reinforced with different percentages of hydrated lime (5%, 10%, 15% dry weight of the soil). The deflection and stress results indicated that lime stabilization or geocell reinforcement alone did not significantly increase subgrade reaction coefficient and bearing capacity values. Promising results were obtained on stabilization of weak subgrade when both techniques were used together. It was determined that cellular reinforcement increased the reaction modulus coefficient value and bearing capacity of the subgrade soil by more than 15% compared to the lime stabilization.

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 OTIMIZAÇÃO DO CÁLCULO DA CAPACIDADE DE CARGA E TENSÃO ADMISSÍVEL DO SOLO PARA SAPATAS ISOLADAS

2016 ◽  
Vol 12 (2) ◽  
Author(s):  
Bruna Leal Melo de Oliveira ◽  
Luciana Barbosa Amancio
Keyword(s):  
Bearing Capacity ◽  
Human Error ◽  
Specific Weight ◽  
Load Test ◽  
Allowable Stress ◽  
Microsoft Excel ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Plate Load Test ◽  
Short Period

RESUMO: Para o dimensionamento geotécnico de fundações superficiais é necessário conhecer a tensão admissível do solo, obtida indiretamente a partir da capacidade de carga; ou diretamente aplicando-se os métodos semiempíricos. Uma alternativa para automatizar esses cálculos é a utilização de planilha eletrônica, uma ferramenta simples, com o intuito de otimizar o tempo e reduzir as falhas humanas. Para demonstrar a aplicabilidade e a eficiência desta ferramenta, desenvolveu-se uma planilha eletrônica através do software Microsoft Excel que, a partir de variáveis como: coesão, ângulo de atrito, peso específico e nível freático; dentre outras, é capaz de estimar a capacidade de carga e a tensão admissível para sapata isolada, em diferentes ocasiões, por diversas metodologias consagradas e, além disso, exibir graficamente a comparação entre os resultados obtidos. Por fim, a ferramenta foi aplicada em três cenários fictícios: (1) sapata quadrada com variação da cota de assentamento; (2) sapata retangular com variação do nível freático e (3) sapata circular com realização de ensaio de placa, comprovando que é possível testar várias hipóteses para um mesmo problema em um curto período de tempo. ABSTRACT: For geotechnical design of shallow foundations it is necessary to know the allowable stress of the soil, obtained indirectly from the load bearing capacity; or directly, applying the semi-empirical methods. An alternative to automate these calculations is the use of spreadsheet, a simple tool, aiming to optimize time and reduce human error. To demonstrate the applicability and effectiveness of this tool, a spreadsheet was developed using the Microsoft Excel software, based on some variables such as: cohesion; friction angle; specific weight; groundwater level; among others, to estimate the load bearing capacity and the allowable stress for isolated footing on different occasions, by several methodologies, and in addition, to show graphically the comparison between the results obtained. Finally, the tool was applied on three fictitious scenarios: (1) Square isolated footing with variation of the settlement quota; (2) rectangular isolated footing with variation of the water level and (3) circular isolated footing with execution of the Plate Load Test, proving that it is possible to test several hypotheses for the same problem in a short period of time.

A Field Study on Bearing Capacity of Al-Najaf Sandy Gypseous Soil

2020 ◽  
Vol 857 ◽  
pp. 179-187
Author(s):  
Mohammed Kadum Fakhraldin
Keyword(s):  
Bearing Capacity ◽  
Field Study ◽  
Field Tests ◽  
Ultimate Bearing Capacity ◽  
Load Test ◽  
Water Infiltration ◽  
Infiltration Process ◽  
Plate Load Test ◽  
Angle Of Internal Friction ◽  
Gypseous Soil

Gypseous considered as problematic soils also gypseous soils are distributed all over the world, as well as in large areas of Iraq, including Al- Najaf city. Gypseous soils are characterized by high strength in dry conditions, but they collapse due to water infiltration process under constant head conditions. In this research, a field study investigates gypseous soils and the effect of soaked state on the bearing capacity and settlement of the gypseous soils are investigated. A site with a high percentage of gypsum (about 25%) was selected to perform plate load tests. The test was carried out in a natural and soaked state on the gypseous soils by plate load test with time-dependent. The results show the ultimate bearing capacity of gypseous soil from plate load test are decrease under the soaking condition and maximum settlement increase. The angle of internal friction (ø) of gypseous soil we obtained from the direct shear test is 47.620 for natural soil. The ultimate bearing capacity of gypseous soil was calculated from the Terzaqhi’s equation and the high difference between field tests and theoretical results.

scholarly journals Investigation of Mechanical and Hydrologic Characteristics of Porous Asphalt Pavement with a Geocell Composite

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3165
Author(s):  
Jaehun Ahn ◽  
Tan Hung Nguyen ◽  
In Kyoon Yoo ◽  
Jeongho Oh
Keyword(s):  
Bearing Capacity ◽  
Hydrological Cycle ◽  
Asphalt Pavement ◽  
Load Test ◽  
Rainfall Simulation ◽  
Base Layer ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Plate Load Test ◽  
Porous Asphalt

Porous asphalt pavement is a part of the permeable pavement system, which can be used to mitigate the negative impacts of urbanisation on the water hydrological cycle and environment. This study aims to assess the mechanical and hydrologic characteristics of porous asphalt pavements, with and without geocell composites, using a plate load test, falling weight deflectometer test, and rainfall simulation test. The corresponding results indicate that the elastic modulus of the unreinforced pavement is lower than that of the reinforced pavement. The analysis demonstrates that the use of geocell composites effectively increases the load-bearing capacity of the pavement. When the base layer is reinforced with geocells, its load-bearing capacity increases. Observation of the rainfall simulation tests on the reinforced pavement indicates that the reinforced pavement effectively handles the surface runoff.

Bearing Capacity of Concrete-Cored DCM Pile Composite Ground

2013 ◽  
Vol 712-715 ◽  
pp. 951-954
Author(s):  
Wang Chi ◽  
Yong Fu Xu ◽  
Ping Dong
Keyword(s):  
Bearing Capacity ◽  
Axial Force ◽  
Field Tests ◽  
Load Test ◽  
Composite Foundation ◽  
Plate Load Test ◽  
Concrete Pile ◽  
Composite Pile ◽  
Composite Ground ◽  
Surrounding Soil

The concrete-cored DCM pile is an kind of composite pile by inserting the inner concrete pile into the DCM column socket. In two test sites, plate load test is used to measure bearing capacity of concrete-cored DCM pile composite ground. Vertical stress of surrounding soil and DCM column socket are measured by pressure cells. The axial force of precast core pile can be obtained by steel stressmeters which welded on the reinforcing steel along depth. The field tests results show that, the bearing capacity of concrete-cored DCM pile composite ground is much larger than that of original soil. The development degree of concrete-cored DCM pile bearing capacity in composite foundation increases steadily during the loading process. Both concrete-cored DCM piles and surrounding soils play an important effect on the bearing capacity of composite foundation.

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