With major facilities such as sports complex,
educational institutions , hospitals, flyovers, multiplex halls, etc.,
Guwahati, the main town in the North Eastern region of India, is growing
rapidly in every aspect. In order to ensure the structural protection and
serviceability of the above-mentioned structures before any building, awareness
of the subsurface soil conditions is important. Therefore, using the
Geographical Information System ( GIS) platform and contour maps of Standard
penetration test N value, Liquefaction potential map and shear wave velocity
map, the ground water table would be of great help to the foundation designers
at the initial stage for site selection and preliminary foundation design in
static and seismic conditions. Contour maps of the Standard N-value penetration
test at different depths and the average N-value contour map of the city of
Guwahati were prepared. Normal penetration Test N for penetration In order to
prepare the N value contour map of Guwahati region, the values and depth of the
water table were taken from a data base of 200 boreholes up to a depth of 30
metres. A regression equation based on twenty-seven previous similar
correlations was also established between shear wave velocity Vs and Standard
penetration test N value. For determining the shear wave velocity of Guwahati
region, this regression equation was used. For all places, the average shear
wave velocity of 30 m depth was calculated and used to generate maps on the
(GIS) platform. In Guwahati region, seismic soil liquefaction was assessed in
terms of the safety factor against liquefaction and the likelihood of
liquefaction along the soil profiles and presented as maps showing zones of
liquefaction risk levels. In order to form a database, other subsurface geotechnical
details of Guwahati region, such as soil classification, depth to water level
from ground surface, are also provided in the form of GIS based maps.
Author (s) Details
Binu Sharma
Department of Civil Engineering, Assam Engineering College, Assam, India.
S. K. Rahman
Department of Civil Engineering, Assam Engineering College, Assam, India.
View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/273
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