Correlation Between Shear Wave Velocity (Vs) and SPT Resistance (N) for Roorkee Region

Abstract

For ground improvement, assessment of damage during an earthquake is very important issue which in turn depends on the ground motion. The characteristics of an earthquake motion at a site depend on the shear wave velocity (V s ). The shear wave velocity profile at a site may not be readily available however, the numbers of blows (N) from standard penetration test (SPT) are readily available. This paper presents a development of reliable correlation between V s measured by multi channel analysis of surface wave tests and N measured using SPT at various sites in Roorkee region. These tests have been carried out at ten different sites in Roorkee region (within a radius of 30 km). The SPT samples are tested in the laboratory for index properties. Roorkee is situated in high seismic zone, therefore the study is important for this region. Based on the statistical assessments, an empirical correlation between V s and N was developed. This is done separately for all types of soils, sands only and clays only. The developed relations fall within the range of other relations developed worldwide for other sites. A comparison with available relations is also presented. The proposed relations will be helpful in seismic microzonation of the region as ground motion is one of the important parameters.

Subsoil seismic characterization through Vs30 for future structural assessment of buildings (Ciudad del Carmen, Mexico)

“…The growth of MASW technique usage, several researchers have correlated the blow count N with shear wave velocity among 195 the main and pioneers stand out Imai and Yoshimura (1970), Ohba and Tourim (1970), Seed and Idriss (1981), and recently Akin, Kramer and Topal (2011), Anbazhagan, Parihar and Rashmi, (2012), Fabbrocino et al (2015), Kirar, Maheshwari and Muley (2016), Tsiambaos and Sabatakakis (2011). In this paper, the blow count and the density widely validated by the mentioned researchers were obtained.…”

Rock Formation and Site Class in Bandar Lampung

“…Tabel 1 memperlihatkan informasi terbatas nilai N-SPT dan litologi penyusun. Nilai kecepatan gelombang geser lapisan ditentukan berdasar hasil penelitian Kirar et al, 2016. SPT-1 yang berada pada Formasi Gunungapi Muda (Qhv) memiliki kemiripan dengan SPT-2 Formasi Lampung (QTI). Kemiripan susunan material (litologi) dan respon kekakuan batuan.…”

“…Vs dari berbagai variable; jenis tanah, ukuran butiran dan kandungan air(Fatehnia et al, 2015;Kirar et al, 2016; Kumar et al, 2016; Cetin et al, 2018). Namun kondisi geologi antar wilayah, menghasilkan variasi impuritas material yang akan mempengaruhi empiris antara SPT-N dan Vs. Kirar et al, 2016 menurunkan empiris hubungan keduanya untuk semua jenis tanah Formasi Tarahan (TPOT) seperti diperlihatkan pada Gambar 1.…”

Comparing Shear-Wave Velocity Determined by MASW with Borehole Measurement at Merapi Sediment in Yogyakarta

“…VS = 104.6 N 0.330 , for structured soil deposits (Molise, Italy), (Fabbrocino et al, 2015) (12) VS = 100.3 N 0.365 , for sands (Roorkee, India), (Kirar et al, 2016) (13) Table 2 shows the N-SPT values of the three boreholes. Equations 1 to 13 were used to empirically convert VS to N-SPT.…”