Dynamic Site Characterization and Correlation of Shear Wave Velocity with Standard Penetration Test ‘N’ Values for the City of Agartala, ... View Full Text


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Article Info

DATE

2013-12-17

AUTHORS

Arjun Sil, T. G. Sitharam

ABSTRACT

Seismic site characterization is the basic requirement for seismic microzonation and site response studies of an area. Site characterization helps to gauge the average dynamic properties of soil deposits and thus helps to evaluate the surface level response. This paper presents a seismic site characterization of Agartala city, the capital of Tripura state, in the northeast of India. Seismically, Agartala city is situated in the Bengal Basin zone which is classified as a highly active seismic zone, assigned by Indian seismic code BIS-1893, Indian Standard Criteria for Earthquake Resistant Design of Structures, Part-1 General Provisions and Buildings. According to the Bureau of Indian Standards, New Delhi (2002), it is the highest seismic level (zone-V) in the country. The city is very close to the Sylhet fault (Bangladesh) where two major earthquakes (Mw > 7) have occurred in the past and affected severely this city and the whole of northeast India. In order to perform site response evaluation, a series of geophysical tests at 27 locations were conducted using the multichannel analysis of surface waves (MASW) technique, which is an advanced method for obtaining shear wave velocity (Vs) profiles from in situ measurements. Similarly, standard penetration test (SPT-N) bore log data sets have been obtained from the Urban Development Department, Govt. of Tripura. In the collected data sets, out of 50 bore logs, 27 were selected which are close to the MASW test locations and used for further study. Both the data sets (Vs profiles with depth and SPT-N bore log profiles) have been used to calculate the average shear wave velocity (Vs30) and average SPT-N values for the upper 30 m depth of the subsurface soil profiles. These were used for site classification of the study area recommended by the National Earthquake Hazard Reduction Program (NEHRP) manual. The average Vs30 and SPT-N classified the study area as seismic site class D and E categories, indicating that the city is susceptible to site effects and liquefaction. Further, the different data set combinations between Vs and SPT-N (corrected and uncorrected) values have been used to develop site-specific correlation equations by statistical regression, as ‘Vs’ is a function of SPT-N value (corrected and uncorrected), considered with or without depth. However, after considering the data set pairs, a probabilistic approach has also been presented to develop a correlation using a quantile–quantile (Q–Q) plot. A comparison has also been made with the well known published correlations (for all soils) available in the literature. The present correlations closely agree with the other equations, but, comparatively, the correlation of shear wave velocity with the variation of depth and uncorrected SPT-N values provides a more suitable predicting model. Also the Q–Q plot agrees with all the other equations. In the absence of in situ measurements, the present correlations could be used to measure Vs profiles of the study area for site response studies. More... »

PAGES

1859-1876

References to SciGraph publications

  • 2013-04-23. Probabilistic seismic hazard analysis of Tripura and Mizoram states in NATURAL HAZARDS
  • 2004-01. The Selection of Field Acquisition Parameters for Dispersion Images from Multichannel Surface Wave Data in PURE AND APPLIED GEOPHYSICS
  • 2004-01-01. Geophysical and Geotechnical Investigations for Ground Response Analyses in RECENT ADVANCES IN EARTHQUAKE GEOTECHNICAL ENGINEERING AND MICROZONATION
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