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Liquefaction Potential Assessment of Guwahati City Using One Dimensional Ground Response Analysis

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Document pages: 19 pages

Abstract: Guwahaticity which lies in the North Eastern region of India, falls in the highest seismic risk zonal level i.e. zoneV in India. However,there are very few works on seismic hazard analysis of Guwahati soil consideringthe local site effects. The effect of large modificationsin seismic waves that occur due to variation in soil properties near the surfaceof the earth is of great importance in geotechnical earthquake engineering. Seismicsoil liquefaction, a soil seismic hazard, is evaluatedin Guwahati city in terms of factor of safety against liquefaction alongthe soil profiles using ground response analysis. One dimensional ground response analysis has been conducted using equivalentlinear and non linear method using the Deepsoil software. The input motion of 2011Sikkim earthquake (Mw = 6.9) having bedrock PGA of 0.152 g at 30 m depthis considered. A comparative study has been made of the equivalent linear and nonlinear analysis in terms of surface PGA (g), maximum strain ( ), maximum stressratio and liquefaction potential using soil profiles of Guwahati city. It has beenobserved that stiffer soil layer results in similar PGA from both the analysis howevernon linear analysis generally gives a lessersurface PGA than by equivalent linear analysis. Non linear analysis generallygives a higher strain range and a lower maximum stress ratio as compared to theequivalent linear method. A slightly higher factor of safety is obtained using nonlinear analysis than using equivalent linear analysis. A soil database of 200 boreholes was used for the study. Spatial distribution of soil liquefaction potential ispresented in the form of GIS based maps of factor of safety values.

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