Influence of positions of the geotextile on the load-settlement behaviour of circular footing resting on single stone column by 2D Plaxis software

2021 ◽  
Vol 2 (107) ◽  
pp. 59-74
Author(s):  
J.S. Yadav ◽  
K. Kumar ◽  
R.K. Dutta ◽  
A. Garg
Keyword(s):  
Carrying Capacity ◽  
Stone Columns ◽  
Stone Column ◽  
Load Carrying Capacity ◽  
Weak Soil ◽  
Load Carrying ◽  
Column Design ◽  
Practical Implications ◽  
Settlement Behaviour ◽  
Circular Footing

Purpose: This study aims to study the load – settlement behaviour of circular footing rested on encased single stone column. Design/methodology/approach: The effect of vertical, horizontal and combined verticalhorizontal encasement of stone column on the load carrying capacity were examined numerically. The effect of stone column dimension (80 mm and 100 mm), length (400 mm and 500 mm), and spacing of reinforcement on the load carrying capacity and reinforcement ratio were assessed. Findings: The obtained results revealed that the load carrying capacity of geotextile encased stone columns are more than ordinary stone columns. For vertically encased stone columns as the diameter increases, the advantage of encasement decreases. Whereas, for horizontally encased stone column and combined vertical- horizontal encased stone column, the performance of encasement intensifies as the diameter of stone column increases. The improvement in the load carrying capacity of clay bed reinforced with combined verticalhorizontal encased stone columns are higher than vertical encased stone columns or horizontal encased stone column. The maximum performance of encasement was observed for VHESC1 of D = 80 mm. Research limitations/implications: For this study, the diameter of footing and stone column was kept same. The interface strength factor between stone column and clay bed was not considered. Practical implications: The encased stone column could be use improve the laod bearing capacity of weak soils. Originality/value: Many studies are available in literature regarding use of geosynthetic as vertical encasement and horizontal encasement of stone column. The study on combined effect of vertical and horizontal encasement of stone column on load carrying capacity of weak soil is very minimal. Keeping this in view, the present work was carried out.

scholarly journals Laboratory Model Tests on Stone Column and Pervious Concrete Columns: A Comparative Study

2021 ◽  
Vol 12 (1) ◽  
pp. 75-89
Author(s):  
Jignesh Patel ◽  
Chandresh Solanki ◽  
Yogendra Tandel ◽  
Bhavin Patel
Keyword(s):  
Carrying Capacity ◽  
Deformation Behavior ◽  
Concrete Columns ◽  
Model Tests ◽  
Pervious Concrete ◽  
Stone Columns ◽  
Stone Column ◽  
Laboratory Model ◽  
Load Carrying Capacity ◽  
Load Carrying

This study aims to perform laboratory model tests to investigate the load-deformation behavior of stone columns (SCs), pervious concrete columns (PCCs), and composite columns (CCs). Here, CC refers to the column which has the upper portion made of PCC and the lower portion made of SC. The parameters investigated in this study include column diameters, column lengths, and installation methods (pre-cast and cast-in-situ methods). The results of the model tests reveal that the axial load-carrying capacity of PCC is nearly 8 times more than that of SC with the same diameter. Moreover, it is also observed that at the top portion of SC, with the PCC length which is about 3.75 to 5 times the column diameter, the load-carrying capacity can significantly increase. It is concluded that the installation methods have marginal influence on the load-deformation behavior of PCC.

scholarly journals Laboratory Experimental Analysis on Encapsulated Stone Column

2013 ◽  
Vol 59 (3) ◽  
pp. 359-379 ◽  
Author(s):  
Y.K. Tandel ◽  
C.H. Solanki ◽  
A.K. Desai
Keyword(s):  
Carrying Capacity ◽  
Soft Soil ◽  
Stone Columns ◽  
Stone Column ◽  
Radial Deformation ◽  
Load Carrying Capacity ◽  
Column Length ◽  
Confinement Pressure ◽  
Load Carrying ◽  
Lower Load

Abstract The application of stone column technique for improvement of soft soils has attracted a considerable attention during the last decade. However, in a very soft soil, the stone columns undergo excessive bulging, because of very low lateral confinement pressure provided by the surrounding soil. The performance of stone column can be improved by the encapsulation of stone column by geosynthetic, which acts to provide additional confinement to columns, preventing excessive bulging and column failure. In the present study, a detailed experimental study on behavior of single column is carried out by varying parameters like diameter of the stone column, length of stone column, length of geosynthetic encapsulation and stiffness of encapsulation material. In addition, finite-element analyses have been performed to access the radial deformation of stone column. The results indicate a remarkable increase in load carrying capacity due to encapsulation. The load carrying capacity of column depends very much upon the diameter of the stone column and stiffness of encapsulation material. The results show that partial encapsulation over top half of the column and fully encapsulated floating column of half the length of clay bed thickness give lower load carrying capacity than fully encapsulated end bearing column. In addition, radial deformation of stone column decreases with increasing stiffness of encapsulation material.

Analysis of misaligned water-lubricated polymer bearing with axial grooves

2019 ◽  
Vol 71 (3) ◽  
pp. 411-419 ◽  
Author(s):  
Fangrui Lv ◽  
Chunxiao Jiao ◽  
Donglin Zou ◽  
Na Ta ◽  
Zhu-shi Rao
Keyword(s):  
Carrying Capacity ◽  
Hydrodynamic Pressure ◽  
Maximum Pressure ◽  
Load Carrying Capacity ◽  
Misalignment Angle ◽  
Content Type ◽  
Load Carrying ◽  
Polymer Bearing ◽  
Journal Misalignment ◽  
Practical Implications

Purpose The purpose of this paper is to analyze the lubrication behavior of misaligned water-lubricated polymer bearings with axial grooves. Design/methodology/approach A lubrication model considering journal misalignment, bush deformation and grooves is established. In dynamic analyses of shaft systems, bearings are usually simplified as supporting points. Thus, an approach for solving the equivalent supporting point location is presented. The influence of misalignment angle and groove number on film thickness, hydrodynamic pressure distribution, load-carrying capacity and ESP location is investigated. Findings As the misalignment angle increases, the location of the maximum pressure and ESP are shifted toward the down-warping end, and the load-carrying capacity of the bearing decreases. In comparison to the nine-groove bearing, the six grooves bearing has a higher load-carrying capacity and the ESP is located closer to the down-warping end for an equivalent misalignment angle. Practical implications The results of this study can be applied to marine propeller shaft systems and other systems with misaligned bearings. Originality/value A study on the lubrication behavior of misaligned water-lubricated polymer bearings with axial grooves is of significant interest to the research community.

scholarly journals 3D FE Analysis of an Embankment Construction on GRSC and Proposal of a Design Method

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Yogendra K. Tandel ◽  
Chandresh H. Solanki ◽  
Atul K. Desai
Keyword(s):  
Carrying Capacity ◽  
Design Method ◽  
Soft Clay ◽  
Deformation Modulus ◽  
Diameter Ratio ◽  
Major Influence ◽  
Stone Column ◽  
Load Carrying Capacity ◽  
Lateral Deformation ◽  
Load Carrying

Stone column is often employed for strengthening of an embankment seated on deep soft clay. But in very soft clay having undrained shear strength less than or equal to 15 kPa, stone column may not derive adequate load carrying capacity and undergo large lateral deformation due to inadequate lateral confinement. In such circumstances, reinforcement to individual stone column by geosynthetics enhances load carrying capacity and reduces lateral deformation. This paper addresses parametric study on behaviour of embankment resting on Geosynthetic Reinforced Stone Column (GRSC) considering parameters such as stone column spacing to diameter ratio, deformation modulus of stone column material, geosynthetic stiffness, thickness of soft clay, and height of embankment by 3D numerical analysis. Finally, equation for Settlement Improvement Factor (SIF), defined as ratio between settlement of embankment without treatment and with geosynthetic reinforced stone column, is proposed that correlates with the major influence parameters such as stone column spacing to diameter ratio, deformation modulus of soft clay, and geosynthetic stiffness.

Extreme pressure properties of nanolubricants for metal-forming applications

2016 ◽  
Vol 68 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Laura Peña-Parás ◽  
Demófilo Maldonado-Cortés ◽  
Jaime Taha-Tijerina ◽  
Patricio García-Pineda ◽  
Gerardo Tadeo Garza ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Metal Forming ◽  
Design Methodology ◽  
Load Carrying Capacity ◽  
Extreme Pressure ◽  
Synthetic Lubricant ◽  
Content Type ◽  
Load Carrying ◽  
Practical Implications ◽  
Nanoparticle Additives

Purpose – The purpose of this paper is to evaluate the extreme pressure properties of CuO and TiO2 nanoparticle additives with the incorporation of a surfactant within a synthetic fluid for metal-forming applications. Design/methodology/approach – The paper studies the effect of CuO and TiO2 nanoparticle additives at various concentrations (0.01, 0.05 and 0.10 wt. per cent) in a synthetic lubricant fluid under extreme pressure conditions. Oleic acid surfactant is added to the nanolubricant to improve dispersion and stability of nanoparticles. Extreme pressure tribological tests are performed on a four-ball T-02 tribotester according to the ITEePib Polish method for testing lubricants under conditions of scuffing. Findings – The results show that the addition CuO and TiO2 nanoparticles under the presence of OA resulted in an increase of the load-carrying capacity (poz) of the lubricant up to 137 and 60 per cent, respectively. The seizure load was also increased by 50 and 15 per cent, respectively. Practical implications – The results show that CuO and TiO2 nanoparticles can be successfully used as additives improving extreme pressure properties of lubricants. Originality/value – This demonstrates the potential of nanoparticle additives using surfactants for improving the extreme pressure properties of lubricants. These nanolubricants can be used for metal-forming applications like deep-drawing, achieving an increased tool life.

scholarly journals Response of Skirted Foundations Resting on Dry Medium Dense Sand

2018 ◽  
Vol 4 (6) ◽  
pp. 1193 ◽  
Author(s):  
Lujain Haider ◽  
Haider M. Mekkiyah
Keyword(s):  
Cross Section ◽  
Carrying Capacity ◽  
Considerable Increase ◽  
Experimental Tests ◽  
Load Carrying Capacity ◽  
Dense Sand ◽  
Load Carrying ◽  
Different Diameters ◽  
Large Soil ◽  
Settlement Behaviour

Experimental model tests were carried out to study the response of skirted foundation resting on dry sand.  The experiments were performed in a large soil container (1000  1000 mm in cross section and 800 mm in height).  Skirts with three different lengths (L) varied from 0.5D to 1.5D was attached to the edge of shallow circular foundations having three different diameters (D=60, 90 and 120 mm). Different parameters have been studied; these parameters involve skirt length, foundation size and skirt conditions. Skirts with open end and closed end were used. The relative density was kept constant and equals to 60%. The case of foundation without skirt (L=0) was initially tested and set as a reference for comparison purpose. From the results of experimental tests, it was found that the skirt modifies the load-settlement behaviour, increasing the load carrying capacity and reducing the foundation settlement. The results also indicate that load carrying capacity of skirted foundation increases with increase skirt length as well as foundation size. The results show that using skirt with closed end brought a considerable increase in load carrying capacity than that of open end.

Load Carrying Capacity Analysis of Multi-Spiral Reinforced Concrete Column

2010 ◽  
Vol 150-151 ◽  
pp. 441-446
Author(s):  
Jing Wu ◽  
Fa Zhou Wang ◽  
Wen Yang ◽  
Qing Jun Ding
Keyword(s):  
Carrying Capacity ◽  
Rectangular Cross Section ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Transverse Reinforcement ◽  
Concrete Column ◽  
Load Carrying Capacity ◽  
Reinforced Concrete Column ◽  
Load Carrying ◽  
Column Design

The behavior of confined concrete is highly dependent on the confinement type of transverse reinforcement, spiral hoops are generally believed to have better confined effect in concrete than rectangular hoops. It is verified through experiments and the oretical calculations that multi-spiral confined concrete columns have better mechanical properties than single spiral columns, the multi-spiral significantly increase the column’s strength, plasticity, ductility and anti-seismic capability. Based on the three-direction stress law of confined concrete, the load carrying capacity of the rectangular cross section concrete column with multi-spiral is analysed in this paper, and the calculated equation of the load carrying capacity is proposed, which provide a theory and calculation basis for multi-spiral confined concrete column design and research.

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