Review of correlations between SPT N and shear modulus: A new correlation applicable to any region

Anbazhagan, P.; Parihar, Aditya; Rashmi, H.N.

doi:10.1016/j.soildyn.2012.01.005

Cited by 69 publications

(24 citation statements)

References 25 publications

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“…A number of design parameters depend on the SPT-N values. Since as early as the 1960's, extensive research has been conducted to develop empirical relationships between Vs and SPT-N and a number of correlations are available in literature (Kanai 1966, Imai 1977, Ohta and Goto 1978, Imai and Tonouchi 1982Seed et al 1983, Sykora and Stokoe 1983, Kalteziotis et al 1992, Sisman 1995, Pitilakis et al 1999, Kiku et al 2001, Jafari et al 2002, Hasançebi and Ulusay 2007, Dikmen 2009, Uma Maheswari et al 2010, Tsiambaos and Sabatakakis 2011, Anbazhagan et al 2012, Shahzada et al 2012, Fauzi et al 2014. These correlations have been developed for different types of soils.…”

Section: Technical Notesmentioning

confidence: 99%

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Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Ahmad

Waseem²,

Abbas

et al. 2015

IJGE

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Seismic microzonation studies are being proposed in Pakistan. In addition, a downhole array of accelerometers was planned to be installed in the University of Engineering and Technology, Mardan Campus. Therefore, extensive geotechnical and geophysical tests were conducted. Shear wave velocity (Vs) is a fundamental parameter required for these microzontation studies. It is feasible in terms of cost and space to determine Vs from Standard Penetration Test (SPT) or Cone Penetration Test (CPT) results through empirical correlations. The purpose of this paper is to explore the applicability and predictability of these correlations to the data collected from the area where downhole array is planned. Data from these surveys was used to evaluate relevant correlations selected from literature. Predicted shear wave velocity values from these correlations were compared with measured shear wave velocity values from seismic crosshole tests. Most SPT-Vs correlations evaluated showed low predictability. The SPT-Vs correlation that showed highest degree of fitness to the dataset was the one developed for Lucknow, India, a city with similar geological setting, workmanship and SPT method employed. Site specific SPTVs correlation was also proposed. Most of the CPT-Vs correlations evaluated showed considerable predictive capability compared to the SPT-Vs correlations.

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Section: Technical Notesmentioning

confidence: 99%

“…Correlation by Anbazhagan et al (2012) shows the greatest degree of fitness to the dataset with R 2 value of 0.45.…”

Section: Evaluation Of Spt-vs Correlationsmentioning

confidence: 99%

Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Ahmad

Waseem²,

Abbas

et al. 2015

IJGE

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“…SWV can be directly measured in field tests or can be estimated from existing correlations between values of SPT-N and SWVs (Hasancebi and Ulusay 2006). A number of correlations are available between SPT-N and SWV; hence, a suitable correlation can be used based on the regional soil types (Anbazhagan et al 2012). Kokusho (2008) highlighted that the current practice of averaging the SWV of top 30-m soil layers does not correlate well with amplification factors.…”

Section: Seismic Site Classificationmentioning

confidence: 99%

“…In particular, SPT-N values are widely used for seismic site characterization, site response, and liquefaction studies for detecting seismic microzonation because of the availability of large data sets. However, these SPT-N values may vary even for identical soil conditions because of their high sensitivity to operator techniques, types of equipment, equipment malfunctions, and poor testing practices (Anbazhagan et al 2012). Hence, SPT-N values are generally recommended only for projects at the preliminary stage or that are under financial constraint ).…”

Section: Site Classification Based On Spt Datamentioning

confidence: 99%

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Influence of Rock Depth on Seismic Site Classification for Shallow Bedrock Regions

2013

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Seismic site classifications are used to represent site effects for estimating hazard parameters (response spectral ordinates) at the soil surface. Seismic site classifications have generally been carried out using average shear wave velocity and/or standard penetration test n-values of top 30-m soil layers, according to the recommendations of the National Earthquake Hazards Reduction Program (NEHRP) or the International Building Code (IBC). The site classification system in the NEHRP and the IBC is based on the studies carried out in the United States where soil layers extend up to several hundred meters before reaching any distinct soil-bedrock interface and may not be directly applicable to other regions, especially in regions having shallow geological deposits. This paper investigates the influence of rock depth on site classes based on the recommendations of the NEHRP and the IBC. For this study, soil sites having a wide range of average shear wave velocities (or standard penetration test n-values) have been collected from different parts of Australia, China, and India. Shear wave velocities of rock layers underneath soil layers have also been collected at depths from a few meters to 180 m. It is shown that a site classification system based on the top 30-m soil layers often represents stiffer site classes for soil sites having shallow rock depths (rock depths less than 25 m from the soil surface). A new site classification system based on average soil thickness up to engineering bedrock has been proposed herein, which is considered more representative for soil sites in shallow bedrock regions. It has been observed that response spectral ordinates, amplification factors, and site periods estimated using onedimensional shear wave analysis considering the depth of engineering bedrock are different from those Abstract: Seismic site classifications are used to represent site effects for estimating hazard parameters (response spectral ordinates) at the soil surface. Seismic site classifications have generally been carried out using average shear wave velocity and/or standard penetration test n-values of top 30-m soil layers, according to the recommendations of the National Earthquake Hazards Reduction Program (NEHRP) or the International Building Code (IBC). The site classification system in the NEHRP and the IBC is based on the studies carried out in the United States where soil layers extend up to several hundred meters before reaching any distinct soil-bedrock interface and may not be directly applicable to other regions, especially in regions having shallow geological deposits. This paper investigates the influence of rock depth on site classes based on the recommendations of the NEHRP and the IBC. For this study, soil sites having a wide range of average shear wave velocities (or standard penetration test n-values) have been collected from different parts of Australia, China, and India. Shear wave velocities of rock layers underneath soil layers have also been collected at depths from a few meters ...

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Bodendynamik

Vrettos¹

2017

Grundbau‐taschenbuch

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Review of correlations between SPT N and shear modulus: A new correlation applicable to any region

Cited by 69 publications

References 25 publications

Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Influence of Rock Depth on Seismic Site Classification for Shallow Bedrock Regions

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