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Response Analysis for Multi Layered Soil

Dibyashree Lohani Poudyal

Abstract


The Kathmandu valley is underlain by thick lacustrine quaternary deposits which are susceptible to ground motion amplification. The realistic modeling of seismic ground response analysis is very important in the seismic microzonation. This however greatly depends on the availability of detailed subsurface geological and geotechnical information as well as strong ground motion records. As there is only limited borehole data on depth to bedrock, geophysical surveys and geotechnical properties of the soil type of Kathmandu valley, a one dimensional seismic response modeling software could only be done based on the number of assumptions for geotechnical parameters and soil depth. Altogether 14 boreholes profile from different sites of the Kathmandu valley before Gorkha Earthquake was used for the seismic response analysis. The results indicate that the maximum amplification is 1.6 times to PGA at bed rock for linear response.

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References


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