Tarun Naskar

Tarun Naskar
Indian Institute of Technology Madras | IIT Madras · Department of Civil Engineering

Doctor of Engineering

About

9
Publications
946
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45
Citations
Introduction

Publications

Publications (9)
Preprint
Full-text available
A high-resolution surface wave velocity spectrum, also known as dispersion image, is of paramount importance for any seismic survey to accurately predict subsurface earth’s properties. The presence of diversified noise in the field acquisition and dissimilar attenuation due to mechanical and radial damping makes it challenging for different wavefie...
Article
A faster computational scheme is proposed to determine multimodal dispersion plots using the stiffness matrix method (SMM) for Rayleigh wave propagation in horizontally layered ground media. The scheme decomposes the governing stiffness matrix (K) into a product of unit lower triangular matrix (L) and the upper triangular matrix (U). Accordingly, t...
Preprint
Full-text available
Bender element is used to determine the shear modulus of the soil sample, and to accurately predict the shear modulus of any sample, it required to preciously locate the advent point of the shear wave component in the recorded output signal. All the existing methods enforces to identify those point manually. The lack of automation makes the process...
Preprint
Full-text available
Three different transformation techniques, namely, (i)w-c, (ii) w-k and (iii) tau-p, has been employed for generating multimodal dispersion images on the basis of multi-channel analysis of surface waves (MASW) data recorded in distance-time domain; here w= circular frequency, c = phase velocity, tau = time intercept, p = phase slowness (1/c) and k...
Article
The complexity involved with the phase unwrapping procedure, while performing the existing spectral analysis of surface waves (SASW) on the basis of two sensors, makes it difficult to automate and requires frequent manual judgment. As a result, this approach generally becomes tedious and may yield erroneous results. The multichannel analysis of sur...
Article
In case of irregular dispersive media, a proper analysis of higher modes existing in a dispersion plot becomes essential for predicting the shear wave velocity profile of ground on the basis of surface wave tests. In such cases, an establishment of the predominant mode becomes quite important. In the current investigation for Rayleigh wave propagat...
Article
This brief article presents a simple modification to the widely-used Kausel-Roësset Stiffness Matrix Method (SMM), and in particular to its implementation in the context of the Thin-Layer Method (TLM). This modification allows making fast and accurate computations of wavenumber spectra even for layered media underlain by infinitely deep half-spaces...
Article
By using six 4.5 Hz geophones, surface wave tests were performed on four different sites by dropping freely a 65 kg mass from a height of 5 m. The receivers were kept far away from the source to eliminate the arrival of body waves. Three different sources to nearest receiver distances (S), namely, 46 m, 56 m and 66 m, were chosen. Dispersion curves...
Article
The vertical uplift resistance of a group of two horizontal coaxial strip anchors, embedded in a general c– soil (where c is the unit cohesion and is the soil friction angle), has been determined by using the lower bound finite element limit analysis. The variation of uplift factors Fc and Fγ, due to the components of soil cohesion and unit weight,...

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Projects

Projects (2)
Project
Develop new wavefield transformation techniques and modify existing ones to produce high-resolution dispersion images for a wide frequency band for better identification of fundamental and higher modes, enhance the reliability of the measurement of the subsurface shear-wave velocity profile, and also increase the sub-surface investigation depth.