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Liquefaction Mapping of Kolkata City Using FOSM Method
Determination of liquefaction potential is getting importance for prevention of the devastating effect of an earthquake. Several deterministic methods have been proposed for predicting liquefaction in the past but studies have shown that all these methods do not account for the different types of uncertainties associated with determination of liquefaction potential. Reliability analysis is a procedure which takes in account of several uncertainties and thereby produces results with reduced error. The city of Kolkata is actively seismic and is placed in seismic zones of III and IV. The soil is mostly alluvial with presence of sand layers along with soft silt and clay. Owing to its huge population, densely spaced buildings and increasing high-rise constructions, liquefaction potential mapping is essential to prevent future disasters. In this study, the liquefaction potential evaluation is conducted on 114 boreholes by the procedures of (Youd et al. in J Geotech Geoenviron 127:817–833, 2001) and Boulanger and Idriss (Boulanger, RW., Idriss, IM.: CPT and SPT-based liquifaction triggering procedures. Technical Report No. UCD/CGM-14/01, University of California, Davis, California, Centre for Geotechnical Modelling, 2014). An earthquake magnitude of 7 is considered and the analysis is done at depths of 7 m and 13 m. Based on these models, First Order Second Moment (FOSM) method is performed and the results are compared. It is concluded that reliability analysis conducted along with deterministic method gives more accurate results and shows that the city is most vulnerable to liquefaction at 7 m depth.
Liquefaction Mapping of Kolkata City Using FOSM Method
Determination of liquefaction potential is getting importance for prevention of the devastating effect of an earthquake. Several deterministic methods have been proposed for predicting liquefaction in the past but studies have shown that all these methods do not account for the different types of uncertainties associated with determination of liquefaction potential. Reliability analysis is a procedure which takes in account of several uncertainties and thereby produces results with reduced error. The city of Kolkata is actively seismic and is placed in seismic zones of III and IV. The soil is mostly alluvial with presence of sand layers along with soft silt and clay. Owing to its huge population, densely spaced buildings and increasing high-rise constructions, liquefaction potential mapping is essential to prevent future disasters. In this study, the liquefaction potential evaluation is conducted on 114 boreholes by the procedures of (Youd et al. in J Geotech Geoenviron 127:817–833, 2001) and Boulanger and Idriss (Boulanger, RW., Idriss, IM.: CPT and SPT-based liquifaction triggering procedures. Technical Report No. UCD/CGM-14/01, University of California, Davis, California, Centre for Geotechnical Modelling, 2014). An earthquake magnitude of 7 is considered and the analysis is done at depths of 7 m and 13 m. Based on these models, First Order Second Moment (FOSM) method is performed and the results are compared. It is concluded that reliability analysis conducted along with deterministic method gives more accurate results and shows that the city is most vulnerable to liquefaction at 7 m depth.
Liquefaction Mapping of Kolkata City Using FOSM Method
Lecture Notes in Civil Engineering
Sitharam, T. G. (editor) / Kolathayar, Sreevalsa (editor) / Jakka, Ravi (editor) / Sett, Srijani (author) / Chattopadhyay, Kalyan Kumar (author)
2022-01-04
17 pages
Article/Chapter (Book)
Electronic Resource
English
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