P. K Basudhar - Profile on Academia.edu (original) (raw)
Papers by P. K Basudhar
Journal of Hazardous Materials, 2018
The study aims to enhance the efficacy of surfactants using salt and multi-walled carbon nanotube... more The study aims to enhance the efficacy of surfactants using salt and multi-walled carbon nanotubes (MWCNT) for washing used engine oil (UEO) contaminated soil and compare the geotechnical properties of contaminated soil before and after washing (batch washing and soil washing). From batch washing of the contaminated soil the efficacy of the cleaning process is established. Contamination of soil with hydro carbons present in UEO significantly affects its' engineering properties manifesting in no plasticity and low specific gravity; the corresponding optimum moisture content value is 6.42% while maximum dry density is 1.770 g/cc, which are considerably lower than those of the uncontaminated soil. The result also showed decrease in the values of cohesion intercept and increase in the friction angle values. The adopted soil washing technique resulted increase in specific gravity from 1.85 to 2.13 and cohesion from 0.443 to 1.04 kg/cm 2 and substantial decrease in the friction angle from 31.16° to 17.14° when washed with most efficient combination of SDS surfactant along with sodium meta-silicate (salt) and MWCNT. Effectiveness of the washing of contaminated soil by batch processing and soil washing techniques has been established qualitatively. The efficiency of surfactant treatment has been observed to be increased significantly by the addition of salt and MWCNT.
Geotechnical and Geological Engineering, 2018
The paper presents flexural analysis of laterally loaded piles considering nonlinear p-y curves a... more The paper presents flexural analysis of laterally loaded piles considering nonlinear p-y curves and the modulus of elasticity of soil estimated from pressuremeter test data treating the pile as a beam on elastic foundation with the load coming at the top. Solution of the problem using nonlinear p-y curves (as suggested by Menard (1975)) is found using an iterative technique as well as elastic continuum approach (following Poulos and Davis approach). Deflection and bending moments were predicted at some designated points and compared with measured valued as reported in literature. The predicted values of deflection of the pile are generally on the higher side for elastic continuum approach. The deflection values when predicted by using nonlinear p-py curves are either lower or higher than the observed values depending on the rheological coefficient. However, the comparison of the results is found to be reasonable and well within the range of experimental errors.
Estimation of Burger Model Parameters by Inverse Analysis of Oedometer Data
Contrary to the forward analysis, inverse analysis can be effectively utilized to determine the p... more Contrary to the forward analysis, inverse analysis can be effectively utilized to determine the parameters of a constitutive model commonly used to represent the stress-strain-time behavior or the loaddeformation-time behavior of the soil. This paper reports the development of a generalized inverse analysis formulation for the parameter estimation of four-parameter Burger model. The analysis is carried out by formulating the problem as that of mathematical programming in terms of identification of the design vector, the objective function and the design constraints. Thereafter, the formulated constrained nonlinear multivariable problem is solved with the aid of fmincon: an in-built constrained optimization solver module available in MatLab. In order to gain experience, a synthetic case-study is considered wherein key issues such as the determination and setting up of variable bounds, global optimality of the solution and the minimum number of data-points required for prediction of parameters are addressed. The results reveal that the developed technique is quite efficient in predicting the model parameters. The best result is obtained when the design variables are subjected to a lower bound without any upper bound. Global optimality of the solution is achieved using the developed technique. Based on the experience gained from the synthetic study, the paper reports the determination of Burger model parameters using real-time 1-D field and laboratory oedometer data.
Geotextiles and Geomembranes, 2010
Apart from other factors, the performance of geosynthetic reinforced soil structures depends also... more Apart from other factors, the performance of geosynthetic reinforced soil structures depends also on the characteristics and behavior of the interface between soil and geosynthetic. Experiments were conducted in a direct shear test apparatus to study the shear force-displacement behavior at the soil-geotextile interface using two differently textured woven geotextiles. Analyzing the data so obtained a non-linear constitutive model has been presented for predicting both the pre-peak and the post-peak interface behavior. The predictions made by the developed model are found to be in good agreement with experimental data obtained from direct shear tests.
SYNOPSIS ~he paper.describes.details of analysis for stability and deformation of mast foundation... more SYNOPSIS ~he paper.describes.details of analysis for stability and deformation of mast foundations during 7nstallat1on operat1ons for a chemical reactor in alluvial deposits. Brief details of the loads 1nvolved, foundation type, installation procedure, and evaluation of geotechnical design para-mete~s have also been presented. The successful installation of the reactor seems to support the pred1cted response of the foundation.
Lowland technology international : the official journal of the International Association of Lowland Technology, 2007
Predictive Models for Estimating the Coefficient of Permeability for Sands
Geotechnical and Geological Engineering, 2010
The paper pertains to the pseudo-static seismic stability analysis of reinforced soil structures.... more The paper pertains to the pseudo-static seismic stability analysis of reinforced soil structures. Using limit equilibrium method and assuming the failure surface to be logarithmic spiral, analysis has been conducted to maintain internal stability against both tensile and pullout failure of the reinforcements. The external stability of the reinforced earth wall is also assessed in terms of its sliding, overturning, eccentricity and bearing modes of failure. The influence of the intensity of the surcharge load placed on the backfill is also considered in the analysis. The obtained results are validated by comparing the same with those reported in literature. Studies have also been made regarding the influence of backfill soil friction angle, horizontal and vertical seismic accelerations, surcharge load, the tensile strength of reinforcement, pullout length of the reinforcement and number of reinforcement layers on the seismic stability against various failure modes as mentioned earlier.
International Journal of Geotechnical Engineering, 2018
The present study presents a generalized analysis and solution procedure for finding the flexural... more The present study presents a generalized analysis and solution procedure for finding the flexural response of beams on viscoelastic foundations. The foundation soil is modelled as a tension membrane interconnecting a series of Burger model representing the time-dependent behaviour of saturated clayey soils and maintaining continuity of stresses and displacement beyond the loaded area as well. The governing differential equations are developed and solved using finite difference scheme. Studies were made to find the optimal mesh size for getting convergent solution matching excellently with those reported in the literature. The relative importance of the different parameters controlling the flexural response of the foundation was assessed and reported.
Design of geosynthetic-reinforced earth using equivalent thickness concept
The paper presents a design methodology for geosynthetic-reinforced earth using equivalent thickn... more The paper presents a design methodology for geosynthetic-reinforced earth using equivalent thickness concept. The reinforced earth or reinforced granular fill is placed on soft soil. The granular fill and the soft soil have been idealized by the Pasternak shear layer and a layer of Winkler springs, respectively. Stretched rough elastic membranes represent the geosynthetic reinforcement layers. Plane strain conditions are considered for the loading and reinforced foundation soil system. An iterative finite difference scheme is applied for obtaining the solution. Based on the result of the present study, design charts are also presented.
The Remigration of Romanian Children
IOS Press, 2013
SOILS AND FOUNDATIONS, 2005
In this paper, geosynthetic reinforced granular fill-soft soil system subjected to a moving load ... more In this paper, geosynthetic reinforced granular fill-soft soil system subjected to a moving load with constant velocity over an infinitely long beam is analyzed. The foundation is assumed as tensionless foundation (to react only in compression). The upper reinforced granular bed is modeled by a rough elastic membrane embedded in Pasternak shear layer overlying a series of compressible Winkler springs representing the underlying soft soil. The parametric studies reveal that the flexural response of the infinite beam as well as of the reinforcement, are greatly affected by the velocity, intensity of load and compressibility of granular fill. The interfacial frictional coefficients, shear modulus of granular layers and coefficient of lateral earth pressure do not significantly affect the response of the beam and the reinforcement for the range of parameters studied.
Finite Element Simulation of Strip Footings Resting on Double Faced Wrap-Around Reinforced Soil Walls
GeoFlorida 2010, 2010
ABSTRACT
The paper presents a comparative study of the predicted response of a liquefiable saturated sand ... more The paper presents a comparative study of the predicted response of a liquefiable saturated sand deposit of Nigata city under different seismic ground motion using three different stress based analytical models due to Finn et al. (1977), Liou et al. (1977), and Katsikas and Wylie (1982). The results are also compared with simplified methods that are adopted in the current design practice. It has been found that the models by Finn et al. (1977) and Katsikas and Wylie (1982) result in close predictions, whereas the predictions by Liou et al. (1977) are significantly different, particularly for predicting the rate of partial liquefaction for the chosen soil deposit and earthquake motions. INTRODUCTION Liquefaction is an earthquake-induced ground failure phenomenon observed in saturated loose sand deposits. Liquefaction involves generation of excess pore pressure, loss of shear strength and excessive volume contraction with associated settlement. Although the simple methods based on SPT...
The Stability of a Trapdoor
地盤工学会論文報告集, Mar 15, 1997
Direct Search for Critical General Slip Surface of Slopes with Nonlinear Strength Envelope
Geotechnical and Geological Engineering
A neural network model for slope stability computations
Géotechnique Letters
Reinforcement Effect on the Static Analysis of Circular Footing Resting over Winkler Elastic Foundation
Geotechnical and Geological Engineering
Interaction and multiscale mechanics, 2012
This paper reports the development of a generalized inverse analysis formulation for the paramete... more This paper reports the development of a generalized inverse analysis formulation for the parameter estimation of four-parameter Burger model. The analysis is carried out by formulating the problem as a mathematical programming formulation in terms of identification of the design vector, the objective function and the design constraints. Thereafter, the formulated constrained nonlinear multivariable problem is solved with the aid of fmincon: an in-built constrained optimization solver module available in MatLab. In order to gain experience, a synthetic case-study is considered wherein key issues such as the determination and setting up of variable bounds, global optimality of the solution and minimum number of data-points required for prediction of parameters is addressed. The results reveal that the developed technique is quite efficient in predicting the model parameters. The best result is obtained when the design variables are subjected to a lower bound without any upper bound. Global optimality of the solution is achieved using the developed technique. A minimum of 4-5 randomly selected data-points are required to achieve the optimal solution. The above technique has also been adopted for real-time settlement of four oil refineries with encouraging results.
Steady State Strength Behavior of Yamuna Sand
Geotechnical and Geological Engineering, 2008
... Sourav De Æ Prabir Kumar Basudhar ... Sourav De Á PK Basudhar (&) Department of Civil... more ... Sourav De Æ Prabir Kumar Basudhar ... Sourav De Á PK Basudhar (&) Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India e-mail: pkbd@iitk.ac.in Sourav De e-mail: sourav_de_net@yahoo.co.in 123 ...
Journal of Hazardous Materials, 2018
The study aims to enhance the efficacy of surfactants using salt and multi-walled carbon nanotube... more The study aims to enhance the efficacy of surfactants using salt and multi-walled carbon nanotubes (MWCNT) for washing used engine oil (UEO) contaminated soil and compare the geotechnical properties of contaminated soil before and after washing (batch washing and soil washing). From batch washing of the contaminated soil the efficacy of the cleaning process is established. Contamination of soil with hydro carbons present in UEO significantly affects its' engineering properties manifesting in no plasticity and low specific gravity; the corresponding optimum moisture content value is 6.42% while maximum dry density is 1.770 g/cc, which are considerably lower than those of the uncontaminated soil. The result also showed decrease in the values of cohesion intercept and increase in the friction angle values. The adopted soil washing technique resulted increase in specific gravity from 1.85 to 2.13 and cohesion from 0.443 to 1.04 kg/cm 2 and substantial decrease in the friction angle from 31.16° to 17.14° when washed with most efficient combination of SDS surfactant along with sodium meta-silicate (salt) and MWCNT. Effectiveness of the washing of contaminated soil by batch processing and soil washing techniques has been established qualitatively. The efficiency of surfactant treatment has been observed to be increased significantly by the addition of salt and MWCNT.
Geotechnical and Geological Engineering, 2018
The paper presents flexural analysis of laterally loaded piles considering nonlinear p-y curves a... more The paper presents flexural analysis of laterally loaded piles considering nonlinear p-y curves and the modulus of elasticity of soil estimated from pressuremeter test data treating the pile as a beam on elastic foundation with the load coming at the top. Solution of the problem using nonlinear p-y curves (as suggested by Menard (1975)) is found using an iterative technique as well as elastic continuum approach (following Poulos and Davis approach). Deflection and bending moments were predicted at some designated points and compared with measured valued as reported in literature. The predicted values of deflection of the pile are generally on the higher side for elastic continuum approach. The deflection values when predicted by using nonlinear p-py curves are either lower or higher than the observed values depending on the rheological coefficient. However, the comparison of the results is found to be reasonable and well within the range of experimental errors.
Estimation of Burger Model Parameters by Inverse Analysis of Oedometer Data
Contrary to the forward analysis, inverse analysis can be effectively utilized to determine the p... more Contrary to the forward analysis, inverse analysis can be effectively utilized to determine the parameters of a constitutive model commonly used to represent the stress-strain-time behavior or the loaddeformation-time behavior of the soil. This paper reports the development of a generalized inverse analysis formulation for the parameter estimation of four-parameter Burger model. The analysis is carried out by formulating the problem as that of mathematical programming in terms of identification of the design vector, the objective function and the design constraints. Thereafter, the formulated constrained nonlinear multivariable problem is solved with the aid of fmincon: an in-built constrained optimization solver module available in MatLab. In order to gain experience, a synthetic case-study is considered wherein key issues such as the determination and setting up of variable bounds, global optimality of the solution and the minimum number of data-points required for prediction of parameters are addressed. The results reveal that the developed technique is quite efficient in predicting the model parameters. The best result is obtained when the design variables are subjected to a lower bound without any upper bound. Global optimality of the solution is achieved using the developed technique. Based on the experience gained from the synthetic study, the paper reports the determination of Burger model parameters using real-time 1-D field and laboratory oedometer data.
Geotextiles and Geomembranes, 2010
Apart from other factors, the performance of geosynthetic reinforced soil structures depends also... more Apart from other factors, the performance of geosynthetic reinforced soil structures depends also on the characteristics and behavior of the interface between soil and geosynthetic. Experiments were conducted in a direct shear test apparatus to study the shear force-displacement behavior at the soil-geotextile interface using two differently textured woven geotextiles. Analyzing the data so obtained a non-linear constitutive model has been presented for predicting both the pre-peak and the post-peak interface behavior. The predictions made by the developed model are found to be in good agreement with experimental data obtained from direct shear tests.
SYNOPSIS ~he paper.describes.details of analysis for stability and deformation of mast foundation... more SYNOPSIS ~he paper.describes.details of analysis for stability and deformation of mast foundations during 7nstallat1on operat1ons for a chemical reactor in alluvial deposits. Brief details of the loads 1nvolved, foundation type, installation procedure, and evaluation of geotechnical design para-mete~s have also been presented. The successful installation of the reactor seems to support the pred1cted response of the foundation.
Lowland technology international : the official journal of the International Association of Lowland Technology, 2007
Predictive Models for Estimating the Coefficient of Permeability for Sands
Geotechnical and Geological Engineering, 2010
The paper pertains to the pseudo-static seismic stability analysis of reinforced soil structures.... more The paper pertains to the pseudo-static seismic stability analysis of reinforced soil structures. Using limit equilibrium method and assuming the failure surface to be logarithmic spiral, analysis has been conducted to maintain internal stability against both tensile and pullout failure of the reinforcements. The external stability of the reinforced earth wall is also assessed in terms of its sliding, overturning, eccentricity and bearing modes of failure. The influence of the intensity of the surcharge load placed on the backfill is also considered in the analysis. The obtained results are validated by comparing the same with those reported in literature. Studies have also been made regarding the influence of backfill soil friction angle, horizontal and vertical seismic accelerations, surcharge load, the tensile strength of reinforcement, pullout length of the reinforcement and number of reinforcement layers on the seismic stability against various failure modes as mentioned earlier.
International Journal of Geotechnical Engineering, 2018
The present study presents a generalized analysis and solution procedure for finding the flexural... more The present study presents a generalized analysis and solution procedure for finding the flexural response of beams on viscoelastic foundations. The foundation soil is modelled as a tension membrane interconnecting a series of Burger model representing the time-dependent behaviour of saturated clayey soils and maintaining continuity of stresses and displacement beyond the loaded area as well. The governing differential equations are developed and solved using finite difference scheme. Studies were made to find the optimal mesh size for getting convergent solution matching excellently with those reported in the literature. The relative importance of the different parameters controlling the flexural response of the foundation was assessed and reported.
Design of geosynthetic-reinforced earth using equivalent thickness concept
The paper presents a design methodology for geosynthetic-reinforced earth using equivalent thickn... more The paper presents a design methodology for geosynthetic-reinforced earth using equivalent thickness concept. The reinforced earth or reinforced granular fill is placed on soft soil. The granular fill and the soft soil have been idealized by the Pasternak shear layer and a layer of Winkler springs, respectively. Stretched rough elastic membranes represent the geosynthetic reinforcement layers. Plane strain conditions are considered for the loading and reinforced foundation soil system. An iterative finite difference scheme is applied for obtaining the solution. Based on the result of the present study, design charts are also presented.
The Remigration of Romanian Children
IOS Press, 2013
SOILS AND FOUNDATIONS, 2005
In this paper, geosynthetic reinforced granular fill-soft soil system subjected to a moving load ... more In this paper, geosynthetic reinforced granular fill-soft soil system subjected to a moving load with constant velocity over an infinitely long beam is analyzed. The foundation is assumed as tensionless foundation (to react only in compression). The upper reinforced granular bed is modeled by a rough elastic membrane embedded in Pasternak shear layer overlying a series of compressible Winkler springs representing the underlying soft soil. The parametric studies reveal that the flexural response of the infinite beam as well as of the reinforcement, are greatly affected by the velocity, intensity of load and compressibility of granular fill. The interfacial frictional coefficients, shear modulus of granular layers and coefficient of lateral earth pressure do not significantly affect the response of the beam and the reinforcement for the range of parameters studied.
Finite Element Simulation of Strip Footings Resting on Double Faced Wrap-Around Reinforced Soil Walls
GeoFlorida 2010, 2010
ABSTRACT
The paper presents a comparative study of the predicted response of a liquefiable saturated sand ... more The paper presents a comparative study of the predicted response of a liquefiable saturated sand deposit of Nigata city under different seismic ground motion using three different stress based analytical models due to Finn et al. (1977), Liou et al. (1977), and Katsikas and Wylie (1982). The results are also compared with simplified methods that are adopted in the current design practice. It has been found that the models by Finn et al. (1977) and Katsikas and Wylie (1982) result in close predictions, whereas the predictions by Liou et al. (1977) are significantly different, particularly for predicting the rate of partial liquefaction for the chosen soil deposit and earthquake motions. INTRODUCTION Liquefaction is an earthquake-induced ground failure phenomenon observed in saturated loose sand deposits. Liquefaction involves generation of excess pore pressure, loss of shear strength and excessive volume contraction with associated settlement. Although the simple methods based on SPT...
The Stability of a Trapdoor
地盤工学会論文報告集, Mar 15, 1997
Direct Search for Critical General Slip Surface of Slopes with Nonlinear Strength Envelope
Geotechnical and Geological Engineering
A neural network model for slope stability computations
Géotechnique Letters
Reinforcement Effect on the Static Analysis of Circular Footing Resting over Winkler Elastic Foundation
Geotechnical and Geological Engineering
Interaction and multiscale mechanics, 2012
This paper reports the development of a generalized inverse analysis formulation for the paramete... more This paper reports the development of a generalized inverse analysis formulation for the parameter estimation of four-parameter Burger model. The analysis is carried out by formulating the problem as a mathematical programming formulation in terms of identification of the design vector, the objective function and the design constraints. Thereafter, the formulated constrained nonlinear multivariable problem is solved with the aid of fmincon: an in-built constrained optimization solver module available in MatLab. In order to gain experience, a synthetic case-study is considered wherein key issues such as the determination and setting up of variable bounds, global optimality of the solution and minimum number of data-points required for prediction of parameters is addressed. The results reveal that the developed technique is quite efficient in predicting the model parameters. The best result is obtained when the design variables are subjected to a lower bound without any upper bound. Global optimality of the solution is achieved using the developed technique. A minimum of 4-5 randomly selected data-points are required to achieve the optimal solution. The above technique has also been adopted for real-time settlement of four oil refineries with encouraging results.
Steady State Strength Behavior of Yamuna Sand
Geotechnical and Geological Engineering, 2008
... Sourav De Æ Prabir Kumar Basudhar ... Sourav De Á PK Basudhar (&) Department of Civil... more ... Sourav De Æ Prabir Kumar Basudhar ... Sourav De Á PK Basudhar (&) Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India e-mail: pkbd@iitk.ac.in Sourav De e-mail: sourav_de_net@yahoo.co.in 123 ...