Anbazhagan Panjamani

Anbazhagan Panjamani
Indian Institute of Science | IISC · Department of Civil Engineering

Doctor of Philosophy,

About

186
Publications
151,917
Reads
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2,491
Citations
Citations since 2016
79 Research Items
1783 Citations
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20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Introduction
Prof. Anbazhagan Panjamani currently works at the Department of Civil Engineering, Indian Institute of Science. Anbazhagan does research in Engineering Seismology, Railway Geotechnical Engineering and Geophysical Engineering.
Additional affiliations
January 2018 - present
Indian Institute of Science
Position
  • Professor (Associate)
March 2015 - March 2016
King Saud University
Position
  • Professor
January 2014 - December 2014
King Saud University
Position
  • Professor
Education
February 2009 - August 2009
University of Wollongong
Field of study
  • Railway Geotechnical Engineering
August 2004 - July 2007
Indian Institute of Science
Field of study
  • Earthquake Geotechnical Engineering
July 2002 - May 2004
College of Engineering Guindy -Anna University
Field of study
  • Soil Mechanics and Foundation Engineering

Publications

Publications (186)
Chapter
Ground motion prediction equation (GMPE) is a major contributing component in establishing seismic hazard values, design coefficient, and risk level for disaster management in the region. Many seismic hazard analyses at a regional level are carried out using GMPEs developed elsewhere. In this study, realistic GMPE function form, suitable GMPEs with...
Chapter
After a major road crash, conducting crash investigation is generally the next step. But the road accident spot analysis is not carried out as per the procedure in most of the road crashes in India. Although crash spot studies are conducted by associated officers, the procedure, implementation, and post-investigation studies are charge framed, nont...
Article
Full-text available
Desaturation of in-situ saturated sandy soils is emerging as a new cost effective and environment friendly liquefaction mitigation technique. In the present study, stress controlled undrained cyclic triaxial tests have been conducted on air injected-desaturated sandy soil and various important issues such as number of cycles required for initial li...
Article
Standard Penetration Test is a widely used geotechnical exploration test worldwide. SPT is easy to perform and is cost-effective; hence, it has become prevalent. Several factors affect the test results, i.e., the number of blows (N-value) for penetration of the sampler into the soil at any given depth. Among those factors, hammer energy (EH) is the...
Conference Paper
In this study, a geophysical investigation is performed in the coastal city of Tuticorin in Tamil Nadu, India, at a location approximately 1.5 km west of the east coast. Standard Penetration Test along with hammer energy measurement was performed for sample collection and topographic identification. Later, Crosshole (CHT) and Multichannel Analysis...
Article
Ground motion input layer depth and Vs are crucial parameters in computing representative surface amplification factor, especially for deep deposits where bedrock depth is unknown. For many soil sites, seismic bedrock depth is unknown and randomly assigning the input motion to any layer may result in bias response. The aim of this study is to under...
Article
Geotechnical investigation often engages several standard penetration tests (SPT) using different types of SPT equipment in a single project without energy measurement. It is a common practice in most Asian countries because there are no codal provisions for energy measurements during SPT. This study measured SPT hammer energy using two types of in...
Article
Propagation of the earthquake motion towards the ground surface alters both the acceleration and frequency content of the motion. Acceleration time record and Fourier amplitude spectrum of the motion reveal changes in the acceleration and frequency content. However, Fourier amplitude spectrum fails to give frequency-time variation. Wavelet transfor...
Article
This paper presents a systematic experimental investigation to understand different failure modes of air desaturated clean sand in undrained cyclic loading for a degree of saturation in the range of 70 % to full saturation. Five distinct failure modes have been observed depending on the degree of saturation, relative density, effective confining pr...
Article
It is essential to determine low strain shear modulus (Gmax) to model dynamic soil response and estimate the site effects due to earthquakes. Several correlations have been developed between dynamic soil properties and soil penetration resistance values such as N-values from Standard Penetration Test (SPT). However, only a few of the established co...
Conference Paper
The main objective of this study is to compare seismic site classification by drilling boreholes with Standard Penetration Test (SPT) N value measurement along with hammer energy recordings at positions below the anvil and above the split spoon sampler, measuring shear wave velocity (𝑉𝑠) by seismic surface wave method of Multichannel Analysis of Su...
Article
Full-text available
This paper addresses the differences between two approaches of damping estimation in the resonant column testing: Steady-State Vibration (SSV) and Free Vibration Decay (FVD) method, at small (<0.005%) to medium (0.07%) strain range. The tests were conducted on “two types of reconstituted sands” and “two types of clayey soils” at different relative...
Article
Full-text available
Deep soil basin is one of the geographical features which significantly alter the response to earthquakes. Around the world, there are regions where bedrock is at a substantial depth upon which are different layers of soil. Larger depths of soil alter the response toward earthquakes and have been reported in the past. Indo-Gangetic Basin (IGB) of I...
Article
Full-text available
Seismic hazard in terms of peak ground acceleration (PGA) and spectral acceleration (SA) for the seismically active Indo-Gangetic Basin (IGB) has been computed using both a fault model and spatially smoothed-grid seismicity model. Seismicity parameters, viz. minimum magnitude, the maximum regional magnitude \({M}_{\mathrm{max}}\), mean seismic acti...
Chapter
Induced desaturation has been emerging as a new liquefaction miti-gation technique. Laboratory study carried out, so far, on induced desaturation has mainly focused on shaking table and centrifuge studies. In the present study, triaxial specimens of saturated clean sand have been desaturated by in-jecting air/CO2 into it and stress controlled undra...
Article
Time domain reflectometry can be applied to measure soil bulk density. Monitoring of bulk density over large areas for geo–statistical analysis requires a fast and effective method allowing for acquisition of many data points. Methods are available in the literature to obtain density from TDR. However, algorithms for simultaneous measurements of de...
Article
Shear strength characteristics of the geosynthetic-reinforced rubber-sand mixture (RSM) has been investigated by conducting Unconsolidated Undrained (UU) triaxial test. In the first part, a series of UU triaxial tests have been carried out to know the size effect of granulated rubber/tyre chips from seven different rubber sizes. RSM sample that pro...
Article
SPT (Standard Penetration Test) being the most widely used field test, has not been effectively regulated in India. Guidelines regarding hammer weight, the height of fall, use of liner are not followed correctly in the field and guidelines for energy transfer efficiency and hammer blow rate are not addressed in the BIS (Bureau of Indian Standards)...
Article
Full-text available
Site amplification coefficients and acceleration design response spectra (ADRS) for the shallow sites in SI are derived based on non-linear site response analysis at 125 locations. Input motions are selected by considering the seismic hazard map for 475 years as return period and inputted at depth where VS ≥ 1,500 m/s. The new site factors, i.e. FP...
Article
Region-specific seismic hazard analysis was carried out for Krishna Raja Sagara Dam site in Karnataka, India. Seismic event data and seismic source data within a 500 km radius were collected. Deterministic seismic hazard analysis was conducted for different methods of earthquake magnitude and location estimation. It was observed that the ground mot...
Article
Amplification is a key paramter considered to account modifcation of seimic wave in the soil for earthquake resistance design of structure placed on soil. Initially, earthquake wave amplifications are related with shear wave velocity (Vs) ratio of soil and foundation layer, and then it was related to average value of Vs up to 30 m (Vs³⁰). Applicati...
Conference Paper
During the 3rd January 2017, Tripura earthquake of magnitude (Mw5.7), soil containing appreciate percentage of silts were erupted to the ground surface owing to the liquefaction. Linear, as well as elliptical features sand boils, were observed along the bank of the Manu river, Tripura, India. In the present study, laboratory and field investigation...
Conference Paper
The comparison of the material damping properties between the two methods in a fixed-free resonant column device: steady-state vibration (SSV) and free-vibration decay (FVD) methods, in a small to medium strain range, is reported. The tests were conducted on the dry sand specimen of a cylindrical size of 50.1 mm x 102 mm. All the samples were subje...
Conference Paper
The resonant column test has been conducted on the reconstituted silty soil specimens obtained from the Indo-Gangetic region of India. Two sets of tests of different percentages of sand, silt, and clay such as (i) 18.67, 71.33, 10 (ii) 12.09, 66.91, 21 have been considered for the study, with emphasis on the effects of clay content. The dry temping...
Article
In this study, an attempt has been made to generate the subsurface profiles using integrated geophysical approach and a site-specific 2-D nonlinear site response analysis at shallow bedrock sites in Peninsular India. The site selected for the study is Tarapur, India in which three survey lines were selected for the sub-surface mapping. The subsurfa...
Article
In this study, microtremor survey was carried out at 31 locations of Indo-Gangetic Plains (IGP) using a pair of portable three-component short-period seis-mometers (Guralp CMG-6T-1) and Kelunji Echo Pro digital data acquisition system. The acquired raw data was processed to obtain the average H/V ratio of the ambient vibration spectrum. The frequen...
Article
Full-text available
Peak ground acceleration (PGA) and study area (SA) distribution for the Patna district are presented considering both the classical and zoneless approaches through a logic tree framework to capture the epistemic uncertainty. Seismicity parameters are calculated by considering completed and mixed earthquake data. Maximum magnitude is calculated usin...
Article
Site amplification coefficients and acceleration design response spectra (ADRS) for the deep Indo-Gangetic Basin (IGB) have been proposed. Non-linear site response analysis is carried out at 275 deep shear wave velocity (V S) profiles by selecting the input motion based on seismic hazard map for 10% probability of exceedence in 50 years. The spatia...
Article
Full-text available
An earthquake of moment magnitude Mw 5.7 shook the northeastern region of India on 3 January 2017 at 14 h:39 min:0.5 s local time. The duration of the tremor lasted for about 5–6 s and had its epicenter in Dhalai District, Tripura, India. Even though the earthquake was of moderate magnitude, it caused damage to several masonry dwellings in Tripura...
Article
New ground motion prediction equation for the active Himalayan region for a wide range of moment magnitude (M w 4-9) and distance (10-750 km) is developed. For simulating the synthetic ground motions; source, path, and site terms are derived using the Fourier amplitude spectrum of the recorded ground motion data. Uncertainty of input parameters is...
Article
Study aims at selecting the suitable shear modulus reduction and damping curve for broad classification of soil, i.e., rock, gravel, sand, and clay. For this purpose, surface and bedrock ground motion recordings from KiK-Net downhole array for both deep and shallow soil sites have been used. Total stress one-dimensional non-linear site-response ana...
Article
Time-average shear wave velocity at top 30 m depth (\(V_{{{\text{S}}30}}\)) is extensively used for site characterization and amplification parameters estimation. However, due to various reasons, the shear velocity profile (\(V_{\text{S}}\)) does not reach to 30 m depth. In this study, using the multichannel analysis of surface waves, \(V_{\text{S}...
Article
Full-text available
The aim of this study is to demonstrate the bias created in the seismic hazard studies due to the choice of magnitude scaling equations without any statistical basis. The earthquake catalogue of Tripura, India, has been used for the purpose of this study. The catalogue was homogenized using the various scaling equations suitable for the region. The...
Article
Full-text available
A new stochastic ground motion prediction equation (GMPE) for low and diverse seismicity region, i.e., Peninsular India has been derived for a wide range of magnitude (\(M_{w}\) 4–8) and distance (10–500 km). Source, path, and site terms have been determined by comparing the recorded and simulated response spectra using derived values from the lite...
Conference Paper
Full-text available
The dynamic properties of shredded rubber-soil mixtures (ShRm), comprising a sub-rounded quartz sand combined with small rubber shreds at 0, 10, 20, 30% by mass, were investigated. Testing ranged from small strain, in resonant column apparatus, to large strain, in cyclic triaxial, all at a frequency of 1 Hz with mean stress equal to 100 kPa. As obs...
Article
The Indo-Gangetic Basin (IGB) is occupied by the thick deposits of different types of loose to dense soil due to the active sedimentation. Till date, no detailed study has been carried out on seismic site characterization, and classification considering shear wave velocity >50 m depth. In this study, surface wave survey was used for determining the...
Article
Full-text available
PGA and SA distribution for Patna district is presented considering both classical and zoneless approach through logic tree frame work to capture the epistemic uncertainty. Seismicity parameters are calculated by considering completed and mixed earthquake data. Maximum magnitude was calculated using three methods namely incremental method, Kijko me...
Chapter
Due to increase in the rate of occurrence of earthquakes and associated damages, site-specific dynamic models are attracted to research in the recent past. The shear modulus degradation curve, damping characteristics and shear wave velocity profile are indispensable input properties required for carrying out the site response analysis. However, mos...
Chapter
Seismic activity in the tectonically active Himalayan region can result in devastation in the contagious deep Indo-Gangetic Basin (IGB). It is filled by alluvial deposits and, therefore, prone to site amplification. IGB had experienced catastrophic earthquake damages due to the presence of thick soil depth of 0.05 km to about 4 km. However, very fe...
Article
Full-text available
This study attempts to develop empirical correlations between average penetration resistance ([Formula: see text]), averaged velocities over depth up to bedrock depth ([Formula: see text]) and 30 m ([Formula: see text]) for shallow depth sites (having bedrock at a depth less than 25 m). A total of 63 shallow sites were assessed for penetration resi...
Article
Full-text available
Lateritic soils are widely spread across the southern and central parts of India. Lateritic formations usually have soft sediments, entrapped between hard to medium soft lateritic rock, which are leached due to the ingress of water during rainy seasons creating hollow sections or cavities which span over large lengths. Laterites are highly heteroge...
Article
Full-text available
An attempt has been made to classify seismic stations installed along the Himalayan belt and in adjoining regions using recorded strong-motion data and different empirical methods. For all recorded data, HVSRs (horizontal-to-vertical spectral ratios) were computed using pseudo-response spectral acceleration (PSA) values. Five empirical techniques b...
Chapter
Full-text available
Subsurface exploration is an indispensable component of any project and requires understanding of the engineering and geologic properties of the soil and rock strata and groundwater conditions that could be useful for the new design project and evaluate performance of the existing project for the retrofitting. Conventional way of drilling borehole,...
Article
Full-text available
Advancement in the seismic networks results in formulation of different functional forms for developing any new ground motion prediction equation (GMPE) for a region. Till date, various guidelines and tools are available for selecting a suitable GMPE for any seismic study area. However, these methods are efficient in quantifying the GMPE but not fo...
Article
Full-text available
Representative computation of ground response parameters requires accurate information about nonlinear dynamic behavior of the soil column, commonly incorporated in site response analysis through shear modulus reduction and damping curves which are functions of the strain level. Most site response studies are carried out by considering a set of exi...
Article
Full-text available
Many empirical relationships for the earthquake ground motion duration were developed for interplate region, whereas only a very limited number of empirical relationships exist for intraplate region. Also, the existing relationships were developed based mostly on the scaled recorded interplate earthquakes to represent intraplate earthquakes. To the...
Article
Recently, site response analysis has become a mandatory step for the design of important structures. Subsurface investigation is an essential step, from where the input parameters for the site response study like density, shear wave velocity (Vs), thickness and damping characteristics, etc, are obtained. Most site response studies at shallow bedroc...
Chapter
Full-text available
Understanding of the dynamic properties of municipal solid waste (MSW) and the response of waste landfill for cyclic loads are important for safe seismic design and ensuring sustainability of landfills. This study presents estimation of the dynamic properties through field and laboratory tests of MSW landfill and dynamic response of Mavallipura lan...
Article
Full-text available
Pore solution salinity has important bearing on engineering behavior of marine sediments as they influence electrochemical stress (A–R) and differential osmotic stress (∆π) of the salt-enriched clays. The electrochemical stress (A–R) is contributed by van der Waals (A) attraction and diffuse ion layer repulsion (R) , while the differential osmotic...
Article
Full-text available
In this study attempt has been made to understand in-situ void ratio in Indo-Gangetic basin (IGB) and to form empirical relations between void ratio and shear wave velocity (Vs), N values considering subsoil investigation data. Multichannel analysis of surface wave (MASW) test and standard penetration test was carried out along with soil property m...
Conference Paper
Shear wave velocity (Vs) structure is a key parameter for site characterization and site effect assessment. Various intrusive and non-destructive (active and passive source) test are available for determining the Vs of subsurface soil layers. But, most of methods are limited to a depth of 30 m and very limited studies are available for measuring th...
Article
Full-text available
Frequently, the extent of damage i.e. damage level in percentage caused to non-engineered buildings from reported earthquake intensity values is unknown, even though intensity scale defines the building damage relating to a particular intensity. The level of structural damage might help in understanding the effect of great earthquakes and the seism...
Article
A seismic hazard map of Kanpur city has been developed considering the region-specific seismotectonic parameters within a 500-km radius by deterministic and probabilistic approaches. The maximum probable earthquake magnitude (Mmax) for each seismic source has been estimated by considering the regional rupture characteristics method and has been com...
Conference Paper
Full-text available
Standard Penetration Test (SPT) N values and the energy correction factor play a crucial role in the soil liquefaction assessment. In the Liquefaction potential assessment, the cyclic resistance ratio is estimated considering soil strength measured through SPT N values. Due to various mechanical energy losses, energy measured just below anvil and a...
Article
Background: Seismic site response analyses are routinely performed for shallow soil deposits. In the seismic site response studies, depth of input motion which is also called as the depth of half-space or bedrock and is one of the important parameters which influence the amplification and attenuation characteristics of any particular site. Objectiv...
Article
Full-text available
Ground-motion prediction equations that are used to predict acceleration values are generally developed for a 5% viscous damping ratio. Special structures and structures that use damping devices may have damping ratios other than the conventionally used ratio of 5%. Hence, for such structures, the intensity measures predicted by conventional ground...
Data
Comparison between the proposed model and the model developed by Newmark and Hall [3] for magnitudes 5.5, 6.5, and 7.5 at a distance of 200 km. The solid lines represent the proposed model and dotted lines denote the model developed in Newmark and Hall [3]. (PDF)
Data
Comparison of the proposed model for magnitudes of 5.5, 6.5, and 7.5 for a hypocentral distance of 200 km with the model proposed by [11]. The solid lines represent the proposed model, while the dotted lines represent the model developed by Idriss [11]. (PDF)
Article
Full-text available
Shear modulus plays a fundamental role in the estimation of the ground response parameters in seismic microzonation studies. A large number of site response studies are still being carried out using SPT data, considering existing correlations between SPT N-values and shear modulus without knowing the effectiveness of the shear modulus correlation f...