A. Boominathan

A. Boominathan
Indian Institute of Technology Madras | IIT Madras · Department of Civil Engineering

Doctor of Philosophy

About

116
Publications
40,933
Reads
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1,140
Citations
Additional affiliations
April 2006 - present
Indian Institute of Technology Madras
Position
  • Professor
Description
  • Teaching, Research and practical consulting in the area of Geotechnical Engineering

Publications

Publications (116)
Article
Full-text available
Shotcrete as a permanent support system is common for many underground openings. However, the performance of the same under seismic loading conditions has not been thoroughly considered, especially in jointed rock tunnels. This paper presents a numerical study using the two-dimensional distinct element modeling (DEM) technique to understand the per...
Article
The Kutch region in India experienced one of the largest intraplate earthquakes on January 26, 2001, with approximately 20,000 fatalities. Although strong motion recordings from the aftershocks in this region indicate basin effects, no detailed numerical studies on the effect of the basin on the ground surface motion in this region have been report...
Conference Paper
Full-text available
Shallowly buried structures have a wide range of application including conveyance of natural gas, water supply, telecommunication to large structures such as railway subways, and highway tunnels. Among which those structures built in loose sand is prone to liquefaction-induced damages and they can be very catastrophic so as to bring normal life to...
Conference Paper
Full-text available
Underground structures buried within liquefiable soil are often likely to get uplifted during an earthquake due to its relatively low unit weight and shallow burial depth. Therefore, there exists a need to come up with a mitigation technique to prevent the uplift of these underground structure, which could be easily applied in field. In this study,...
Article
The Foundation Input Motion (FIM) arising out of kinematic soil-pile interaction forms an integral part of the seismic analysis of pile-supported structures. Several studies in the recent past have recognized the importance of the filtering effect produced by pile foundations. This paper presents a comprehensive investigation of the influence of ra...
Chapter
The cyclic simple shear tests best represent the in situ seismic stress conditions. However, cyclic triaxial tests are more popularly used. Also, the sand–rubber tire shred mixtures have recently gained research importance for their potential and possibility to act as seismic base isolation materials of buildings. The past studies could be found wh...
Article
Waves propagating through rocks when intersected with joints gets transmitted or reflected. Joints or discon-tinuities in a rock affect the amplitude and velocity of the transmitted and reflected waves propagating through it. The changes occurring on a transmitted wave is following the properties of the incident wave namely fre-quency, amplitude, w...
Chapter
Ground vibrations arising from construction and industrial activities and road/rail traffic can induce settlement issues, cracks, and severe damage to adjacent and remote structures. One of the well-established methods to eliminate such unwanted ground-borne vibrations is to incorporate trench barriers between the source of vibration and the struct...
Chapter
Pile driving induced vibrations creates a huge concern for the construction industry since it may cause damage to the surrounding structures or settlement of the soil, depending on the intensity of ground shaking or vibration. It is essential to estimate the transmitted vibration intensity to avoid structural damages, which are highly dependent on...
Article
One of the leading causes for the damage of various underground structures during an earthquake is soil liquefaction, and among this liquefaction-induced uplift of these structures is a major concern. In this study, finite-difference modelling is carried out to study the liquefaction-induced uplift of an underground structure of 5 m diameter (D) wi...
Chapter
The recent studies focus on the sand and rubber tire shred mixtures for their application as seismic base isolation of buildings. The dynamic properties such as shear modulus and damping ratio of these materials are very important for the above seismic soil-structure analysis. Cyclic triaxial testing is widely used to determine the large strain dyn...
Article
The Geotechnical Seismic Isolation (GSI) is recently recommended as an innovative base isolation system placed below the foundation of the superstructure for protection from earthquake damages. Low-shear modulus and high damping material such as Sand-Rubber Mixture (SRM) is used for the GSI layer. However, the compressible nature of SRM in the GSI...
Article
Full-text available
Undrained cyclic responses of rubber-sand mixtures are essential for its applications in earthquake-prone areas. Hence, the present study is intended to examine the liquefaction behaviour and modeling the undrained cyclic responses of granulated rubber-sand mixtures with size of sand and granulated rubber less than 2 mm. The stress controlled undra...
Article
Full-text available
The foundation input motion (FIM) that a structure experiences during an earthquake, is known to be different from the free field ground motion due to soil structure interaction (SSI) effects. Kinematic interaction in a single pile can also introduce a rotational component to the FIM. Conventionally, soil structure interaction is performed by apply...
Article
The role of underground metro tunnels in a modern urban society is indispensable. Nowadays, these populous metro tunnel networks are becoming a prime target for terror strikes around the world. Considering these terror threats, it is crucial to study the vulnerability of tunnels when subjected to an internal explosion. This paper evaluates the vuln...
Article
The dynamic properties of mixtures of poorly graded sand and the fine rubber tire chips are assessed under undrained, strain-controlled cyclic simple shear (CSS) conditions. In this study, CSS equipment with a confining pressure system is used. The CSS tests are performed on the mixtures with rubber content of 0%, 10%, 30%, 50%, and 100% by weight...
Article
Evaluation of the impedance functions and internal forces in various modes of vibration form an important step in the design of pile supported structures subjected to dynamic loads. This study tries to assess the variation in impedance functions and load distribution characteristics when a ground contacting pile cap is introduced over single and gr...
Article
A finite-difference modeling was performed to investigate the liquefaction-induced uplift of an underground structure. The liquefaction-induced uplift of a 5 m diameter underground structure buried at a depth of 5.5 m was analyzed. The soil was modeled using the elastic-perfectly plastic Mohr–Coulomb model by incorporating the Finn–Byrne pore-press...
Article
In the present study, laboratory plate load tests were carried out on sand compaction columns (SCC) installed in dry sandbed to assess the behavior of the SCC improved strata under static loading. The drop hammer compaction method was used to install the columns in the sandbed prepared for a particular density in the test tank. Column depth and dia...
Conference Paper
The foundation input motion (FIM) that a structure experiences during an earthquake, is known to be different from the free field ground motion due to soil structure interaction (SSI) effects. Kinematic interaction in a single pile can also introduce a rotational component to the FIM. Conventionally, soil structure interaction is performed by apply...
Conference Paper
Pile foundations are employed used to support superstructure loads in strata with incompetent shallow soil layers. Impedance functions for pile foundations in various modes of vibration, forms an important step in Soil Structure Interaction (SSI) analysis of pile supported structures. Most of the available expressions for vertical impedances, origi...
Article
The Indo Gangetic Plain (IGP) that lies on the verge of subduction zone of Indian and Eurasian plate is a seismically active, densely populated region with deep soil deposits. A number of critical structures such as rail and highway bridges and nuclear power plants are being built in the region to cater to the large population of the region, and he...
Article
Full-text available
This paper deals with the characterization of dry sand-rubber tire shred mixtures to find shear strength and dynamic properties. A series of ordinary triaxial shear tests, direct shear tests and dynamic triaxial tests were performed on dense dry sand-rubber tire shred mixtures for various rubber replacement levels such as 0, 10, 30, 50 and 100% by...
Article
Full-text available
The damage pattern observed during the 1819 Kutch earthquake and 2001 Bhuj earthquake of magnitude [Formula: see text] in India implied the significance of the effect of Kutch basin on seismic ground motion. In the present study, the Kutch rift basin is modeled as a simplified rectangular basin of size 150[Formula: see text]km [Formula: see text] 9...
Article
To mitigate earthquake-related damage to buildings, a simple alternative method to conventional base isolation techniques is to provide a geo-base isolation (GBI) system, composed of a scrap tire-sand mixture, between the base of the building foundation and the supporting soil medium. The GBI system should possess adequate dynamic stiffness and dam...
Chapter
The alarming rate at which the scrap rubber tires are generated, its uncontrolled disposal in the environment causing severe pollution are some of the major issues to be addressed. The disaster inflicted by the earthquakes on the low-rise buildings and the unavailability of an affordable low-cost isolation system demand immediate engineering attent...
Conference Paper
Spatial variation of ground motion has a significant impact on the response of structures that extend over long distances parallel to the ground. Large, relatively rigid foundations are known to average spatially varying ground motion, within its envelope. This paper discusses the response of a typical containment structure (CS) supported by a 40m...
Conference Paper
In several recent earthquakes, significant damages and loss of life has been directly related to various site effects like local soil condition, basin effect and effect of surface topography. Three dimensional basin structures are found to have significant effect on ground motions. The present study is aimed at investigating the effect of basin on...
Chapter
In several recent earthquakes, significant damages and loss of life has been directly related to various site effects like local soil condition, basin effect and effect of surface topography. Three dimensional basin structures are found to have significant effect on ground motions. The present study is aimed at investigating the effect of basin on...
Article
This study deals with the determination of the engineering properties of sand–rubber tire shred mixtures. The rubber tire shreds of fine size are mixed with river sand in various controlled proportions and tested under dense, fully saturated conditions. The monotonic direct shear tests, one-dimensional compression, and the permeability tests are co...
Article
This paper presents a study on three dimensional seismic soil structure interaction analysis of a piled-raft (PR) foundation in clay by the substructure approach. Two different pile modeling techniques were adopted and compared with centrifuge shaking table test results reported in literature. The effect of pile spacing on dynamic impedances, kinem...
Chapter
Disposal of scrap rubber tyres is a big challenge and a serious environmental problem. In India, it is estimated that one waste tyre per person is produced annually. The percentage of recycling is very less when compared to the stockpiling every year. It is widely known that the rubber is a good damping material. Consequently, there is a big scope...
Chapter
Mechanised tunnelling method using Tunnel Boring Machine (TBM) is widely used in urban settings due to the lesser construction duration and minimal surface disruption. However, field-monitoring studies report ground movements and damages to the buildings under which the TBM ploughed through. Hence, it is important to attain a detailed understanding...
Chapter
Piled raft foundation is gaining popularity as a composite foundation system economizing foundation design for tall, heavy structures. The seismic response of a piled raft foundation would involve complex raft–soil–pile interaction as well as pile–soil–pile interaction, which cannot be estimated efficiently by existing methods available for pile gr...
Conference Paper
The dynamic simple shear condition serves as the best field stress condition during seismic shaking. Conventional simple shear equipment comprises the specimens within the confines of stacked rings or wire reinforced membrane. This study employs a new dynamic simple shear apparatus capable of applying confining pressures similar to the triaxial tes...
Conference Paper
It is a known fact that the earthquakes cause huge loss to life and property. By and large, the seismic isolation systems are employed for massive structures mostly in developed countries. But the ordinary residential and commercial buildings remain vulnerable to the destructive effects of ground motions. It is necessary that the common masses of d...
Conference Paper
It is crucial to estimate the seismic ground motion at the surface to study the response of buildings, structures and geotechnical facilities. The seismic motion may get amplified at the surface due to soil layering or complex topographical irregularities such as hill crest and basins. The amplification of seismic waves due to wave reflection and r...
Conference Paper
Full-text available
Pile raft foundation system has been accepted as an economic foundation design for high rises and heavily loaded structures. Seismic response analysis of PR foundation systems involves complex pile-soil-pile interaction as well as raft-soil-pile interactions, for which simplified methods have limitations. Kinematic rocking of a pile group is known...
Chapter
Design ground motions are usually developed by one of two approaches: by performing site-specific analyses or from provisions of building codes. Although contemporary codes consider the site effects to an extent, they provide more conservative estimates. Hence, site-specific analysis, which involves both the seismic hazard analysis and ground respo...
Article
Recycled rubber tire mixed with sand has been examined as embankment material, retaining wall backfill and buried pipes backfill. Applications of these mixtures in the field would experience two kinds of interfaces, one is between the structure and the mixture and the other is between the mixture and the existing ground. Therefore the present study...
Article
The present study examines the behavior of particulate rubber-sand mixtures (PRSM) due to the replacement of sand with fly ash. Particulate rubber (PR) of different gravimetric proportions (0, 10, 30, 50, and 100%) is mixed with sand and fly ash for the present study. Vibratory table technique, Proctor compaction technique, and minicompaction techn...
Conference Paper
Owing to the scarcity of the river sand, the accumulation of scrap rubber tires which are produced at an alarming rate and the existing expensive seismic isolation systems, it is very important to find an alternative, low-cost and effective seismic isolation system especially for the developed and the under-developed countries. The recent studies s...
Conference Paper
Lifeline structures which are employed worldwide for the conveyance of water, sewage, oil, natural gas, and other material, gets uplifted during an earthquake due to the liquefaction of the soil in which they are buried. From the damages observed from the past earthquakes, it can be seen that many of these lifeline structures lie in the region with...
Article
The sand-rubber tire shred mixtures have recently gained the attention of researchers for its potential application as seismic isolation materials. The determination of strain-dependent dynamic properties is crucial for the seismic performance of sand-rubber tire shred mixtures. The cyclic triaxial tests are widely used to find out the dynamic prop...
Chapter
Soil–structure interaction (SSI) analysis has been recognized to be an essential step in the design of important structures. With the advent of powerful computers, SSI analysis capabilities have increased by leaps and bounds. This article presents recent research on dynamic SSI analysis of pile-supported structures using direct- and substructure-ba...
Conference Paper
The recent researches show that the sand and rubber tyre shred mixtures have the potential for base isolation of low-rise buildings. The deficiency of river sand and the accumulation of scrap rubber tyres generated necessitate the finding of an alternative low-cost base isolation system. Most of the previous researches have focused on the evaluatio...
Article
This paper presents the results of experimental investigations on sand–rubber tire shred mixtures. The sand and rubber tire shreds considered were of uniform fine size (<2 mm). Static and dynamic characterization was carried out for pure sand, pure rubber, and sand–rubber tire shred mixtures with rubber content varying 10, 30, and 50% by weight. Fi...
Conference Paper
It is a known fact that the stockpiling of scrap rubber tires is an environmental issue in megacities. Hence, the utilization of scrap rubber tires for engineering applications, in particular, for low-cost seismic isolation of buildings is of paramount importance. This paper presents the results of monotonic triaxial and cyclic triaxial tests carri...
Conference Paper
Full-text available
Reduction of damages to the structures due to the earthquake is being studied by various researchers with the help of various sizes of rubber from scrap tires mixed with sand. Higher content of rubber is required in the mixture to have the better performance against the earthquake loadings. It is observed from the literature that the higher content...
Conference Paper
Piled raft foundations have gained acceptance as an economic foundation system for high rise buildings and heavy structures. The composite nature of a soil-piled raft system results in complex soil structure interaction phenomena that has been subjected to intense study in the past decade. Numerical simulation of seismic SSI of such foundation syst...
Conference Paper
The variation observed in ground motion of most earthquakes is due to various site effects like local soil condition, basin effect and effect of surface topography. Influence of two dimensional sedimentary basin structures on ground motions, including wave reflections and surface wave generation at basin edges; known as basin effect, are found to h...
Conference Paper
Full-text available
Deep excavations are often required for infrastructure projects, power plant structures and underground transport systems. In the recent urban development, due to lack of space, it is required to carry out deep excavations very near to adjacent structures. For sites with limited space, it is always required to carry out deep excavation near existin...
Conference Paper
Disposal of scrap rubber tyres is a big challenge and a serious environmental problem. In India, it is estimated that one waste tyre per person is produced annually. The percentage of recycling is very less when compared to the stockpiling every year. It is widely known that the rubber is a good damping material. Consequently, there is a big scope...
Article
A series of small scale dynamic experiments have been carried out on 2 × 1 model aluminum batter pile group embedded in soft clay. The batter angles vary from 0 to 20 degrees. The pile group is subjected to sinusoidal lateral loads of different magnitudes (20–90 N), constituting 20–40% of its static ultimate capacity with the frequency in the range...
Conference Paper
Full-text available
The utilization of recycled scrap rubber tyre chips in seismic isolation of structure is a low cost earthquake mitigation technique which can potentially reduce the intensity of seismic shock propagation into the structure. The current paper deals with the seismic response of a typical structure which has layers of recycled scrap tyre mixtures p...
Article
The determination of dynamic characteristics of soil-pile system by full-scale lateral dynamic pile load testing is an important aspect in the design of pile foundations subjected to dynamic/seismic loads. Field test results are very useful for validating existing linear/non-linear models, which are used to predict the dynamic stiffness and damping...
Conference Paper
This present study investigates the dynamic response of reinforced concrete tunnels subjected to internal explosion using three dimensional explicit Finite Element analyses. The analysis is carried out using the Finite element tool Abaqus/Explicit. A typical underground tunnel of 5 m diameter embedded in a clayey stratum at a depth of 9.0 m below t...
Article
Clay deposits often exhibit inherent anisotropy due to different microfabrics, resulting from both environmental conditions during deposition and stress conditions subsequently. Many anisotropic elastic-plastic models are developed for modeling the behavior of clays subjected to anisotropic stress conditions. In this study, the drained and undraine...
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...
Conference Paper
Full-text available
: Probabilistic seismic hazard analysis (PSHA) has been conducted for a nuclear power plant (NPP) site at Kalpakkam located in the southern part of Peninsular India. The logic tree approach has been used to obtain the uniform hazard spectra (UHS) for return periods of 475 and 10000 years in terms of spectral accelerations. Hazard deaggregation has...
Article
Full-text available
Dynamic experiments were carried out on instrumented model aluminium single piles embedded in clay of different consistencies to study its bending behaviour under lateral loads. Piles with different length to diameter ratios were used. Dynamic lateral load of different magnitudes ranging from 7 to 30 N at wide range of frequencies from 2 to 50 Hz w...
Conference Paper
Full-text available
The determination of dynamic characteristics of soil-pile system by full-scale lateral dynamic pile load testing is an important aspect in the design of pile foundations subjected to dynamic loads. Field test results are very useful for validating existing linear/nonlinear models which are used to predict the dynamic stiffness and damping of the so...
Article
Full-text available
In this paper, the seismic response analysis of deeply embedded ventilation stack is addressed by considering the effects of soil-foundation-structure interaction (SFSI). Seismic SFSI analysis of the stack subjected to a site-specific design ground motion is carried out using finite element method. A parametric sensitivity analysis is made to inves...
Article
The effects of pile spacing, number of piles and configuration on displacement and bending response of pile groups in clay under dynamic lateral loading have been investigated. The displacement response of pile group in clay is strongly nonlinear. Pile –soil-pile interaction is predominant for the groups with closer spacing and with more number of...
Chapter
Design ground motions are usually developed by one of the two approaches: site-specific analyses or from provisions of building codes. Although contemporary codes do consider approximately the site effects, they provide more conservative estimates. Hence it is preferred to carry out site specific analysis which involves both the seismic hazard anal...
Article
The objective of the paper is study the effects of Soil-Foundation- Structure Interaction (SFSI) on seismic response of a deeply embedded Nuclear Island Building (NIB) using the finite element method. The interaction analysis of the NIB is carried out using flexible volume substructure method (FVSM). The SFSI model of the embedded NIB is subjected...
Article
Microfabric plays an important role in the engineering behavior of soils. Although many studies are available in the literature on the effect of microfabric on the static behavior of soils, the effect on the cyclic behavior is less understood. In the present study, samples with different microfabric were prepared in the laboratory by reconstituting...
Article
Liquefaction is the transformation of cohesionless saturated soil skeleton from loose to dense state causing reduction of shearing resistance due to increase in pore water pressure and drop in effective stress. Understanding the liquefaction behaviour is limited mainly to empirical approaches, although progress has been made in constitutive modelin...
Article
The nonlinear response of sand under cyclic loading and generation of pore-water pressure under undrained condition imparts complexity in modeling the cyclic response of sand. The generation and dissipation of pore pressure necessitates modeling more realistically the response of sand as a two phase system. Coupled models that capture the nonlinear...
Article
Subsurface conditions play a major role in the damage potential of earthquakes and the seismic soil amplification of a site which is a critical factor affecting the level of ground shaking. Shear wave velocity (Vs) of the soil layer is an important parameter influencing the amplification behaviour of the site. Site characterization in calculating s...
Conference Paper
Full-text available
During an earthquake, the ground motion characteristics of the site are significantly affected by the presence of soil deposits. The ground motion characteristics at the surface are evaluated by simplified site classification method or by carrying out rigorous site specific ground response analysis. In all these methods, the shear wave velocity (V...
Article
This paper presents the results of two-way cyclic lateral load tests carried out on model pile groups embedded in soft marine clay. The tests are conducted on 1×2, 2×2 and 3×3 pile groups having length to diameter ratio (L/D) of 15, 30 and 40 with the spacing to diameter ratio (S/D) of 3, 5, 7 and 9. The experimental results are presented in the fo...
Article
Full-text available
The influence of initial conditions, i.e. stress state and void ratio, on the liquefaction resistance of silty sands under two-way cyclic loading is investigated in this paper. Using a cyclic triaxial test device, a series of undrained stress-controlled cyclic triaxial tests was performed on reconstituted specimens of sand and sand mixed with 15, 3...
Conference Paper
Full-text available
A full 3D numerical analysis is performed using FLAC 3D to evaluate the ground borne vibrations caused by underground trains for typical sites in Chennai. The shear wave velocity profile obtained from MASW tests were used in the analysis. Sinusoidal input motions with Peak Particle Velocity (PPV) of 0.2x10-3 m/s having dominant frequency of 10 Hz a...