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Identification and Quantification of Liquefaction-Induced Lateral Spreading Potential of Guwahati City Soil
An attempt is made in this study to understand and quantify the liquefaction-induced lateral spreading potential of Guwahati city soil in the Indian state of Assam. Past studies have shown that Guwahati city soil is prone to liquefaction. Liquefaction-induced lateral spreading in Guwahati city was reported during the 1897 Assam EQ (MW-8.1). However, no studies have been conducted to identify the probable locations or to estimate the displacement lengths of lateral spreading during similar future earthquakes. In this study contour maps developed by previous researchers for scenario earthquakes of 1869 Cachar EQ (MW-7.5) and 1897 Assam EQ are used to identify sites with high liquefaction potential. The identified sites are further classified as prone to lateral spreading based on sub-soil properties, layer thickness, fines content, depth of ground water table, ground slope, earthquake magnitude, and source-to-site distance. The aforementioned parameters are then employed in a Multiple Linear Regression (MLR) model to estimate the amounts of displacement at the classified locations. The displacement lengths are found to range between 0.02 and 0.11 m. Based on case studies the flow direction of lateral spreading at some of the locations is also identified.
Identification and Quantification of Liquefaction-Induced Lateral Spreading Potential of Guwahati City Soil
An attempt is made in this study to understand and quantify the liquefaction-induced lateral spreading potential of Guwahati city soil in the Indian state of Assam. Past studies have shown that Guwahati city soil is prone to liquefaction. Liquefaction-induced lateral spreading in Guwahati city was reported during the 1897 Assam EQ (MW-8.1). However, no studies have been conducted to identify the probable locations or to estimate the displacement lengths of lateral spreading during similar future earthquakes. In this study contour maps developed by previous researchers for scenario earthquakes of 1869 Cachar EQ (MW-7.5) and 1897 Assam EQ are used to identify sites with high liquefaction potential. The identified sites are further classified as prone to lateral spreading based on sub-soil properties, layer thickness, fines content, depth of ground water table, ground slope, earthquake magnitude, and source-to-site distance. The aforementioned parameters are then employed in a Multiple Linear Regression (MLR) model to estimate the amounts of displacement at the classified locations. The displacement lengths are found to range between 0.02 and 0.11 m. Based on case studies the flow direction of lateral spreading at some of the locations is also identified.
Identification and Quantification of Liquefaction-Induced Lateral Spreading Potential of Guwahati City Soil
Lecture Notes in Civil Engineering
Jose, Babu T. (editor) / Sahoo, Dipak Kumar (editor) / Vanapalli, Sai K. (editor) / Solanki, Chandresh H. (editor) / Balan, K. (editor) / Pillai, Anitha G. (editor) / Raghavendra, Konathala (author) / Baro, Olympa (author)
Indian Geotechnical Conference ; 2022 ; Kochi, India
2024-09-25
12 pages
Article/Chapter (Book)
Electronic Resource
English
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