Department of Civil Engineering

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Browsing Department of Civil Engineering by Author "NATH, SNEHASISH"

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    GROUND RESPONSE ANALYSIS AND LIQUEFACTION POTENTIAL AT TWO BRIDGE SITES IN SILCHAR TOWN
    (National Institute of Technology, Silchar, 2026) NATH, SNEHASISH
    Silchar, in southern Assam, is the state's second most densely inhabited city, with an economy cantered on agriculture, forestry, and tea cultivation. The current study focuses on ground response analysis and liquefaction potential assessment at two key bridge sites: Itkholaghat and Sadarghat. Subsurface soil conditions were characterized using detailed geotechnical data from eight boreholes across these sites collected from the Public Works Department (PWD) of Assam. Ground response analysis was carried out with the SHAKE2000 software, which included a typical acceleration time history from a Mw 7.2 Indo-Burma region earthquake obtained from the COSMOS Virtual Data Centre. The peak ground acceleration (PGA) values obtained were then used to determine the liquefaction potential of the soil profiles. The analysis shows that most boreholes are highly susceptible to liquefaction, particularly at shallow depths, due to the presence of loose, moist soil layers. Borehole 5 (BH5) at the Sadarghat bridge site, on the other hand, shows significant resistance to liquefaction up to 30 m deep, most likely due to denser or more cohesive soil strata. Furthermore, the study considers the impact of seasonal groundwater table variations, which is an important aspect in liquefaction assessment. It was discovered that as the groundwater table rises closer to the ground surface—particularly during monsoon seasons—the likelihood and severity of liquefaction increase significantly. These findings emphasize the significance of site-specific geotechnical evaluation and groundwater concerns in seismic risk assessment and infrastructure design in the region.