Estimated Empirical Correlations Between Shear Wave Velocity and SPT-N Value for Indore City Using NLR and ANN

  • PDF / 3,118,146 Bytes
  • 17 Pages / 595.276 x 790.866 pts Page_size
  • 8 Downloads / 184 Views

DOWNLOAD

REPORT


STATE OF THE ART/PRACTICE PAPER

Estimated Empirical Correlations Between Shear Wave Velocity and SPT-N Value for Indore City Using NLR and ANN Deepshikha Shukla1



Chandresh H. Solanki1

Received: 30 May 2019 / Accepted: 31 January 2020  Indian Geotechnical Society 2020

Abstract In this paper, an attempt has been made to propose a generalized correlation between shear wave velocity (Vs) and SPT-N values for all soil types for generalized depth using the concepts of regression. Around 40 correlations have been compiled and applied for estimating the shear wave velocity (Vs) correlation for the region and also to address the uncertainty issue. The generated correlation is then used for the computation of Vs for one-dimensional (1D) ground response analysis at two different site locations in Indore region. 1D ground response analysis is performed using DEEPSOILv6.1. Soil profiles at site taken as input for analysis were collected from 245 boreholes at 26 different locations in the Madhya Pradesh region (one of the central states in India), and it can be concluded that Vs– N correlations estimated after reducing the errors applying the multilinear perceptron and generalized regression neural network models using MATLAB coding gave better results over the linear regression analysis applied for the site-specific ground response analysis. Keywords Shear wave velocity  Correlation  1D  GRA  GIS  SPT-N value  Contour mapping  Nonlinear regression  ANN

& Deepshikha Shukla [email protected] Chandresh H. Solanki [email protected] 1

Applied Mechanics Department, SVNIT Surat, Surat, Gujarat 395007, India

Introduction Earthquake events for the past 50 years have demonstrated the impact of site effects on the magnitude of the damages caused due to earthquake events [1]. The earthquake events can be neither predicted nor measured accurately [2]. But if the effects and the damage likely to be caused due to these events can be estimated, then it will be possible to prevent huge damage to life and property [3]. In the past few years, it has been noticed that the occurrence of major earthquake events such as Killari (1993) and Koyna (1967) in India has paved ways to carry out research in the field of earthquake engineering. Similarly, the occurrence of sudden earthquake event in Jabalpur city (1996) which lies in the central part of India [4] has also caught attention and motivated various scientists and researchers to carry out the studies in other regions of central part of India and in other cities such as Chennai, Bangalore, Delhi and Mumbai (Boominathan et al. [2], Rao and Satyam [5], Sitharam and Anbazhagan [6] and Mhaske and Chaudhary [7]). The study of local site conditions and ground motion plays an important role in the quantification of hazard and its analysis [8]. The behavior of the structure during seismic wave propagation through the soil layers is influenced by the local site effects given by Shreyasvi et al. [9] as shown in Fig. 1. Probabilistic approach of hazard computation involves t