Liquefaction potential assessment of Guwahati city using first-order second-moment method

Singnar, Longbir; Sil, Arjun

doi:10.1007/s41062-018-0138-3

“…However, when FS < 1, the Mw7.8 (0.18g) earthquake shows a slightly higher probability than the other two. The graphical results were validated with the previous similar study made by Singnar and Sil (2018) for Guwahati city, India. 5m, 3m, 4.5m, 6m, 7.5m, 9m, 12m and 15m were interpolated for three earthquake scenarios.…”

Section: Criteriasupporting

confidence: 60%

Probabilistic Liquefaction Potential of Kathmandu Valley Soil Based on Standard Penetration Tests

Subedi

¹

,

KC

²

,

Acharya

³

et al. 2023

Preprint

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Despite being a liquefaction susceptible zone, Kathmandu Valley soil in Nepal has limited studies on liquefaction potential and most of them are based on the deterministic approach. Although this method is widely used, it ignores the uncertainties of seismic parameters such as peak ground acceleration, amax, and earthquake magnitude, Mw as well as the inherent variabilities of soil layers, in-situ testing procedures, and geotechnical properties. On the other hand, the probabilistic approach helps assess the liquefaction potential by considering all these uncertainties. In this study, we assess the liquefaction hazard in the Kathmandu Valley using the first-order second-moment (FOSM) method as a probabilistic approach for liquefaction hazard assessment. The assessment is done for three likely-to-recur scenario earthquakes utilizing the geotechnical data of 1510 boreholes. The soils are characterized geotechnically to further assess susceptibility criteria of liquefaction in the valley. The assessment reveals that the central part of the valley is more vulnerable to liquefaction than other parts and the liquefaction probability increases with increasing depth up to 9 m, after which has geared down the value. Moreover, a relationship between the probability of liquefaction (PL) and the factor of safety (FS) against liquefaction is established. The hazard maps prepared for different earthquake scenarios can be useful for future infrastructure planning in Kathmandu Valley.

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“…However, when FS < 1, the Mw7.8 (0.18g) earthquake shows a slightly higher probability than the other two. The graphical results were validated with the previous similar study made by Singnar and Sil (2018) for Guwahati city, India. Weighted (IDW) interpolation.…”

Section: Geotechnical Characterizationsupporting

confidence: 60%

Probabilistic Liquefaction Potential of Kathmandu Valley Soil Based on Standard Penetration Tests

Subedi

¹

,

KC

²

,

Acharya

³

et al. 2023

Preprint

0

View full text Add to dashboard Cite

Despite being a liquefaction susceptible zone, Kathmandu Valley soil in Nepal has limited studies on liquefaction potential and most of them are based on the deterministic approach. Although this method is widely used, it ignores the uncertainties of seismic parameters such as peak ground acceleration, amax, and earthquake magnitude, Mw as well as the inherent variabilities of soil layers, in-situ testing procedures, and geotechnical properties. On the other hand, the probabilistic approach helps assess the liquefaction potential by considering all these uncertainties. In this study, we assess the liquefaction hazard in the Kathmandu Valley using the first-order second-moment (FOSM) method as a probabilistic approach for liquefaction hazard assessment. The assessment is done for three likely-to-recur scenario earthquakes utilizing the geotechnical data of 1510 boreholes. The soils are characterized geotechnically to further assess susceptibility criteria of liquefaction in the valley. The assessment reveals that the central part of the valley is more vulnerable to liquefaction than other parts and the liquefaction probability increases with increasing depth up to 9 m, after which has geared down the value. Moreover, a relationship between the probability of liquefaction (PL) and the factor of safety (FS) against liquefaction is established. The hazard maps prepared for different earthquake scenarios can be useful for future infrastructure planning in Kathmandu Valley.

show abstract

“…The graphical results were validated with the previous similar study made by Singnar and Sil (2018) for liquefaction potential assessment of Guwahati city, India. The study's outcomes in terms of the PL are presented in Figures 13-15.…”

Section: Criteria Liquefaction Susceptibilitysupporting

confidence: 58%

Probabilistic Liquefaction Potential of Kathmandu Soil Based On Standard Penetration Tests

Subedi

¹

,

Acharya

²

2021

Preprint

1

0

View full text Add to dashboard Cite

Despite being a liquefaction susceptible zone, Kathmandu Valley soil in Nepal has limited studies on liquefaction potential and most of them are based on the deterministic approach. Although this method is widely used, it ignores the uncertainties of seismic parameters such as peak ground acceleration, amax, and earthquake magnitude, Mw as well as the inherent variabilities of soil layers, in-situ testing procedures, and geotechnical properties. On the other hand, the probabilistic approach helps assess the liquefaction potential by considering all these uncertainties. In this study, we assess the liquefaction hazard in the Kathmandu Valley using the first-order second-moment (FOSM) method as a probabilistic approach for liquefaction hazard assessment. The assessment is done for three likely-to-recur scenario earthquakes utilizing the geotechnical data of 1510 boreholes. The soils are characterized geotechnically to further assess susceptibility criteria of liquefaction in the valley. The assessment reveals that the central part of the valley is more vulnerable to liquefaction than other parts and the liquefaction probability increases with increasing depth up to 9 m, after which has geared down the value. Moreover, a relationship between the probability of liquefaction (PL) and the factor of safety (FS) against liquefaction is established. The hazard maps prepared for different earthquake scenarios can be useful for future infrastructure planning in Kathmandu Valley.

show abstract

Liquefaction potential assessment of Guwahati city using first-order second-moment method

Cited by 10 publications

References 21 publications

Probabilistic Liquefaction Potential of Kathmandu Valley Soil Based on Standard Penetration Tests

Probabilistic Liquefaction Potential of Kathmandu Valley Soil Based on Standard Penetration Tests

Probabilistic Liquefaction Potential of Kathmandu Valley Soil Based on Standard Penetration Tests

Probabilistic Liquefaction Potential of Kathmandu Soil Based On Standard Penetration Tests

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