G. R. Dodagoudar

G. R. Dodagoudar
Indian Institute of Technology Madras | IIT Madras · Department of Civil Engineering

Ph.D.
Physics based fault rupture models and seismic hazard assessment for nuclear installations of India

About

123
Publications
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Publications

Publications (123)
Article
Full-text available
Fuzzy-probabilistic seismic hazard analysis(FPSHA)is performed for Chennai city, South India incorporatingboththerandomandfuzzyuncertainties.RandomnessishandledusingMonte-Carlo simulation technique, and fuzziness is accounted in the hazard analysis using fuzzy logic. The magnitude of earthquakes and epicentral distances are fuzzified and used as in...
Article
Full-text available
The rocking shallow foundation (RSF) allows seismic protection of the superstructure by guiding the plastic hinge onto the soil. Fragility curves are probabilistic measures to estimate the likelihood that a structure and/or its components exceed a particular damage state for a given intensity measure. In this study, the fragility analysis of the br...
Article
Open caissons are massive foundations sunk to the required depth by excavating the soil in contact with the cutting edge of the caisson through the annular space of the shaft. The sinking of caisson initiates when the soil in contact with the cutting edge fails in bearing. The evaluation of bearing capacity of the cutting edge helps in proper plann...
Article
Full-text available
Weaker sections of a railway track, such as the approach sections, are prone to differential settlement under the action of repeated train loads. The railway tracks degrade more quickly at a critical section adjacent to a traditional rail bridge because of progressive deterioration. Opting for an integral abutment instead of a traditional bridge is...
Article
Guidelines on the response analysis of rocking shallow foundations considering material uncertainties under earthquake loading are not available in any great detail. In this study, a reliability analysis of a bridge pier with a rocking shallow foundation (RSF) was performed, using the Monte Carlo simulation technique, applied on the performance fun...
Conference Paper
Full-text available
The Mechanically Stabilized Earth (MSE) wall is used as a substitute structure for conventional cantilever walls and gravity walls. Performance of the MSE wall mainly depends upon the backfill and foundation soil type and interaction between soil with facing panels. Parametric analyses using a two-dimensional FEM tool PLAXIS is carried out to inves...
Article
Titania decorated on graphene oxide nano-sheets (TiO2-GO-N) was developed by a two-step procedure. The TiO2-GO-N was then characterized by energy dispersive spectroscopy (EDS), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) analyses. Scherrer equ...
Article
Full-text available
Strength characteristics of loose to medium dense sand deposits improved by sand compaction piles (SCPs) are assessed by performing three-dimensional (3D) finite-element analysis using PLAXIS 3D. The Mohr–Coulomb model is employed to model the behavior of both sand and SCP. A laboratory test is performed on the SCP-treated sand deposit to validate...
Chapter
Full-text available
The analytical evaluation of the bearing capacity of the ring footing and cutting edge of the open caisson requires a definition of the size of failure zone in the soil, whereas the failure zone in soil depends on the type of soil and the configuration of the ring footing and cutting edge of the open caisson. In the study, the 1 g model tests are c...
Article
Resistance offered by the soil to the cutting edge of the caisson and soil flow around the cutting edge will vary continuously during sinking. In this study, a series of 1g model tests are performed to investigate the load-penetration response and soil flow mechanism in sand around the cutting edge of the circular open caisson. Full-and half-open c...
Article
Full-text available
Hybrid earth retaining structure (HERS) is an efficient solution for earth retention problems that face spatial constraints. Deformation and stability analyses of the HERS have not been studied rigorously. The present study focuses on the development of predictive equations for the estimation of maximum lateral facing displacement and global factor...
Article
Modelling the spatial variability of soil properties is very much essential in establishing the engineering parameters for the design and construction of geotechnical structures and facilities. The Standard Penetration Test (SPT) ‘N’ value of a location is widely used to determine the engineering properties of the soils through empirical correlatio...
Article
Slopes stabilised with piles are seldom analysed considering uncertainties in the parameters of the pile-slope system. Reliability analysis of the pile-slope system quantifies the degree of uncertainties and evaluates the safety of the system. In the present study, the reliability analysis of a slope stabilised with piles is performed using the fir...
Article
In the seismic design of bridges, formation of plastic hinges plays an important role in the dissipation of seismic energy. In the case of conventional fixed-base bridges, the plastic hinges are allowed to form in the superstructure alone. During seismic event, such bridges may be safe from collapse but the superstructure undergoes significant plas...
Conference Paper
In low to moderate seismicity regions such as stable continental regions , the seismic hazard analysis requires proper compilation of earthquake catalogue and seismic source zoning. The identification of active seismic sources and evaluation of associated seismicity parameters also pose difficulties. In this paper, an attempt has been made to analy...
Article
Full-text available
The Mechanically Stabilized Earth (MSE) wall is used as an alternative designed structure for conventional cantilever walls and gravity walls. This wall behaves as a coherent block considered as flexible, which can sustain loading types and deformations due to the interaction between the backfill and the inclusion materials. The MSE wall is used in...
Chapter
Full-text available
Heaving of expansive soil is a crucial phenomenon due to their excessive volume changes with variation in moisture regime, which in turn leads to substantial distress to the structures built on them. The main objective of this study is to evaluate the effectiveness of micropile and performance of geotextile to resists upward movement of structures...
Article
Ring footing is defined by a radius ratio (r i /r o) which is the ratio of the inner radius (r i) to outer radius (r o) of the ring footing. The behaviour of ring footings (r i /r o = 0 to 1) lies in-between the behaviour of circular (r i /r o = 0) and strip footings (r i /r o = 1). In this study, the variation of bearing capacity factors N' c , N'...
Article
In this study, the vertical bearing capacity factors N'c, N'q and N' are evaluated for smooth and rough base ring footings resting on c- soil using the finite element method. The radii ratio, (ri/ro), is the ratio of internal radius to the external radius of the ring footing, is varied from 0 to 0.75 with an increment of 0.25. The friction angle...
Article
Open caissons are sunk into the ground by their own weight. A cutting edge of the caisson having a tapered inner face on loading – that is, raising of the steining – results in bearing failure by displacing the soil which is in contact with the cutting edge. The bearing capacity of the cutting edge and the soil flow mechanism depend on the configur...
Chapter
Full-text available
Mechanically stabilized earth (MSE) retaining walls are the most suitable design alternatives to the conventional retaining walls due to their simple, rapid, and cost-effective construction, reduced right-of-way acquisition, etc.; hence, the MSE walls are used in many central, state, and private sector projects. But the design and analysis is a cha...
Chapter
Full-text available
Landslides are defined as down slope movement of rock, debris and earth under the influence of gravity. Slide is one of the most common types of hazards on slopes, which might lead to considerable casualties and economic loss. The study and analysis of slope is essential in understanding their performance and, in particular, their stability, reliab...
Conference Paper
Full-text available
Performance-based design (PBD) provides an efficient, economical and robust design procedure to target specific levels of performance expected from engineered systems. The PBD will realize its full potential, if sufficient data on the expected seismic performance of structural systems and its components, foundations and supporting soil types are av...
Article
Finite element method can be used for computing bearing capacity of shallow foundation with irregular geometry resting on variable subsoil. It is necessary to quantify the parameters affecting the ultimate capacity of footing. This paper presents the results of finite element (FE) analysis of the ultimate failure load of a rough base rigid strip fo...
Article
Full-text available
The objective of this study is to analyse the response of Geosynthetic Reinforced Soil (GRS) bridge abutments under lateral push towards the backfill. Hypoplastic constitutive model is adopted as the user defined material model in the subroutine, VUMAT, to represent the soil behaviour in finite element (FE) analysis. The unreinforced abutment and G...
Conference Paper
Open caissons are deep foundations sunk into the ground by removal of soil within the caisson shaft. A cutting edge with a tapered inner face is used at the bottom of the caisson to allow the bearing failure of the soil which is in contact with the cutting edge. The soil is removed within the shaft of the caisson during sinking which results in bea...
Article
Full-text available
Many bridge abutments suffered severe damages due to pounding of superstructure elements of the bridge during seismic excitation. Collision of the girder is resisted by passive pressures mobilised in the backfill soils. Seismic load on the bridge structure causes the bridge abutments to undergo lateral translation (Δ) and rotation. The present stud...
Chapter
Full-text available
Open caissons are sunk into the ground by removal of soil within the caisson shaft. During sinking of caisson, the stresses in the soil at the cutting edge increase and result in the bearing failure of soil. The extent of soil failure in the excavation side of the open caisson is termed as influence zone. In this paper, the finite element analysis...
Article
Full-text available
Behaviour of reinforced retaining wall depends upon the type of back fill soil, foundation soil and reinforcements used in the system. In the present study, reinforced wall had been analysed using finite element numerical tool PLAXIS 2D. Different types of reinforcements such as, HDPE Geogrid, PET Geogrid and Ribbed steel strip were used for wall....
Article
Full-text available
The use of foundations for support of retaining walls and earth fill embankments has increased in recent years to become a geotechnical solution for rapid construction of earth structures in soft ground conditions. With a growing number of successful case histories involving foundations in difficult ground conditions for various transportation appl...
Article
Full-text available
Introduction. For the quick and accurate analysis and design of MSE walls, many methods are available. Some of the standard methods are as follows: analytical method of analyses which include the BS, FHWA-NHI, AASHTO recommendations, Limit equilibrium analysis (Bishop's, Spencer, Janbu etc.), Finite element (FE) analysis using computer programs lik...
Article
Subsurface characterization and clear distinction between layer boundaries in geological profiles are essential for successful completion of engineering projects. Due to limitations in accessing the vast and diverse subsurface information, efficient management of geotechnical data is of special importance. This study presents the methodology of bui...
Conference Paper
Full-text available
Surface wave technique is an efficient non-invasive tool for characterization of near-surface geomaterials, which is a fundamental step toward geologic hazard assessment. In the present study, combined active and passive surface wave techniques have been used to measure the shear wave velocity in the upper 30 m layers of the geologic environment at...
Poster
Full-text available
ABSTRACT: In this study, the finite element (FE) analysis is carried out to evaluate the ultimate capacity of a single barrette using plane strain idealization. The effect of strength parameters, deformation parameters, unit weight of the soil, surcharge, interface strength between the barrette and soil and geometry of the barrette on the ultimate...
Conference Paper
Full-text available
In this study, the finite element (FE) analysis is carried out to evaluate the ultimate capacity of a single barrette using plane strain idealization. The effect of strength parameters, deformation parameters, unit weight of the soil, surcharge, interface strength between the barrette and soil and geometry of the barrette on the ultimate capacity o...
Article
Full-text available
Site characterization involves taking samples of soil, testing the samples, and evaluation of subsurface features, subsurface material types and their properties. The accuracy of characterization depends on ground features, subsoil condition and changes in geological aspects. In order to get the geotechnical properties of the soil stratum, it is ne...
Article
Three-dimensional (3D) solid models thoroughly and completely define the stratigraphy of the subsurface including complex boundaries. They are particularly useful for practical geotechnical analysis and engineering design. In recent years, there are many sophisticated subsurface investigations have been planned and undertaken for various infrastruc...
Article
Full-text available
High intensity rainfall leads to slope failures that are initially unsaturated. Rainfall is the main triggering factor for the slope failure; however, the denseness of the soil with associated soil properties has not received adequate attention on the stability of the slopes. In this study, the finite difference analysis of transient water flow thr...
Article
Full-text available
Probabilistic seismic hazard analysis (PSHA) is carried out for the archaeological site of Vijayapura in South India in order to obtain hazard consistent seismic input groundmotions for seismic risk assessment and design of seismic protection measures for monuments, where warranted. For this purpose the standard Cornell-McGuire approach, based on s...
Article
Full-text available
The mode of failure associated with settlement is invariably observed to be critical with regard to the performance of raft foundation. The inherent randomness in the associated parameters necessitates a probability-based assessment and design of raft. This paper presents settlement analysis of a raft foundation accounting for randomness in the des...
Article
This paper presents the study pertaining to the strains that are developed near the cutoff walls employed in the foundation medium of the dam section. A total of sixteen finite element simulations are considered in the study, where the combination and placement of the cutoff walls in the foundation medium are varied. A cutoff wall is made to act as...
Conference Paper
Full-text available
The intricacy of expansive soil lies within the variation of moisture content. Many ground improvement techniques have been incorporated to reduce the swell-shrink characteristics of expansive soil. The current study is in order to study the mechanism and effect of basalt fiber reinforced expansive soil, a series of Unconfined Compressive Strength...
Conference Paper
Full-text available
Landslides are defined as down slope movement of rock, debris and earth under the influence of gravity. Slide is one of the most common types of hazards on slopes, which might lead to considerable casualties and economic loss. The study and analysis of slope is essential in understanding their performance and in particular, their stability, reliabi...
Conference Paper
Full-text available
Mechanically stabilized earth (MSE) retaining walls are the most suitable design alternatives to the conventional retaining walls due to their simple, rapid and cost effective construction, reduced right-of-way acquisition etc; hence the MSE walls are used in many central, state and private sector projects. But the design and analysis is a challeng...
Conference Paper
Full-text available
Mechanically stabilised earth is a composite construction material which stabilizes the unstable slope. The strength of engineering fill is enhanced by horizontal laying of the artificial reinforcing elements such as steel or the geo synthetic materials. These materials are of strong inextensible tensile reinforcement in the form of strip. The forc...
Article
Full-text available
Early-age cracking appertains to massive concrete elements on the account of thermal gradients due to highly exothermic hydration reaction of cement. The cracking as a result of thermal strains can in turn lead to undesirable consequences on structural durability. In this paper, a degree of hydration-based finite element simulation procedure is dev...
Conference Paper
Full-text available
Vijayapura is a town in South India which hosts a mausoleum, Gol Gumbaz, famous for the fourth largest dome in the world. The construction of Gol Gumbaz was completed in 1656 and it is an important monument in Indo-Islamic architecture, well known for its amazing dimensions and unique acoustic features. The archeological site of Vijayapura is frequ...
Article
Full-text available
Site characterization is a basic activity towards the proper analysis, design, construction and long term performance of all types of geotechnical structures, ranging from substructures, excavation, earth dams, embankments, seismic hazards, environmental issues, tunnels, and offshore structures. In view of this, it is essential to understand the so...
Article
Full-text available
Settlement of foundations is of crucial concern as it affects the strength and durability of the superstructure as well as the foundation itself. Traditional settlement analysis methodologies cease to incorporate uncertainties associated with design parameters of the foundation. Probability-based settlement analysis of raft foundations accounting f...
Chapter
Full-text available
The most important parameter in the kernel density estimator is the bandwidth or spread or window width. The bandwidth of the kernel density estimator, which follows the power law, is determined using the nearest neighborhood technique for the earthquake catalog which is divided into bins. For reliable hazard estimates, the magnitude bins used in d...
Article
Full-text available
The present study illustrates the slope stability analysis of dyke using limit equilibrium and finite element methods. Stability analysis of the dyke has to be carried with the methods practiced for earthen dam. The stability of the dyke is analyzed using limit equilibrium (SLOPE/W) and finite element (PLAXIS 2D) methods under different constructio...
Article
Full-text available
Dams are mainly constructed of earth and rock-fill materials and hence they are generally referred to as embankment dams or fill-type dams. Earth-fill dams are simple structures which are able to prevent the sliding and overturning because of their self weight. Due to lack of suitable clay materials, sometimes the dams are designed as zoned core th...
Article
Full-text available
In mass concrete constructions, concrete at early age experiences thermal deformations due to heat generation caused by the hydration reactions. when these deformations are restrained, stresses will develop and lead to cracking of concrete with undesirable consequences on the aesthetics and structural durability. In such scenarios, the use of numer...
Conference Paper
Full-text available
During earthquakes, soil plays a great role for the safety of supported structures. Dynamic soil properties are very useful in Earthquake Geotechnical Engineering problems like ground response analysis, seismic soil-structure interaction, problems due to liquefaction, etc. The two important parameters required for analysing the above problems are t...
Conference Paper
Abstract. Mapping surficial and subsurface conditions play an important role in analysis and design of geotechnical structures and facilities. Spatial distribution of depth to soil-bedrock interface has a prime significance in developing input ground motion at the surface and estimating damage potential of an earthquake. This paper deals with the e...
Article
Conventional finite element method (FEM) relies on deterministic values to represent structural and load parameters and it does not have the capability of considering random parameters in response evaluation of the structures. In the context of stochastic computational mechanics, uncertainty modeling using random finite element method (RFEM) has by...
Conference Paper
Full-text available
Local site conditions can amplify the ground motion in certain frequency ranges and this amplified response should be considered while estimating the design ground motion. In this paper, the results of the in-situ shear wave velocity measurements performed using Multi-channel Analysis of Surface Waves (MASW) tests at some of the prominent locations...
Conference Paper
Full-text available
In mass concrete constructions, concrete at early ages experiences thermal deformations due to heat generation caused by the hydration reactions. When these deformations are restrained, stresses will develop and can lead to cracking of concrete with undesirable consequences on aesthetics and structural durability. The use of numerical models in ord...
Article
The present study illustrates the modeling of underground tunnel for subsurface analysis of site using finite element methods. In particular the effect of overburden weight, the nature of the contact between the tunnel and surrounding soil and the geometry of tunnel with respect to the direction of tunneling on the subsidence pattern has been inves...
Article
This paper presents the settlement analysis of shallow foundations resting on granular soils within the framework of probability theory. Two probabilistic approaches of reliability analyses such as point estimation method (PEM) and first order second moment method (FOSM) along with the non-linear finite element analysis are used to evaluate the rel...
Article
This article presents meshfree analysis for beams on elastic foundation. The elastic supports can be found in a variety of engineering problems, for example in the case of actual foundations or in the case of railroad track. Any constitutive model may be used for simulating the action of the soil media. Currently, the finite element method (FEM) is...
Conference Paper
This paper presents an alternative numerical method to model the two dimensional contaminant transport through saturated porous media using a finite difference method (FDM) and finite element method (FEM). A finite-difference model is constructed by dividing the model domain into square and rectangular regions called blocks or cells. Concentrations...
Article
The most important parameter in the kernel density estimator is the bandwidth or spread or window width. The bandwidth of the kernel density estimator, which follows the power law, is determined using the nearest neighborhood technique for the earthquake catalog which is divided into bins. For reliable hazard estimates, the magnitude bins used in d...
Article
The present work is intended to study the effect of variation of seismic area source zone on hazard value for Chennai, India. In the conventional Cornell-McGuire approach to probabilistic seismic hazard analysis, the seismic activity rate for an area source is most often determined using the Gutenberg-Richter (G-R) recurrence law. The seismic area...
Article
Adequate information on dynamic soil properties, especially strain dependent shear modulus (G) and damping ratio (ξ) for each soil layer are the essential input data for seismic ground response analysis and soil-structure interaction studies. In the present study, the shear modulus and damping ratio of sand are estimated for a wide range of strains...