Abstract:
This research aims at using of geographic information system to created Bangkok subsoil profile, undrained shear strength and standard penetration test terms of contour lines and studies of soil properties by using statistics in whole Bangkok and each districts. The data used in this study were obtained from 1,083 boreholes around Bangkok. Moreover this study compared the results between this study and past studies. The results showed that the soil profile around Bangkok which can be summarized as follows: weathered clay 0.5-5.5 m. average 2.45 m. with differences in soil profile, soft clay 8-23 m. average 13.94 m with differences in soil profile and stiff clay 14.5-41.2 m average 22.44 m. The depth of stiff clay tended to increase from north to south but not significantly differed in east-west direction. The average undrained shear strength of soft and stiff clay were 1.89 and 10.56 t/m2 respectively, while the average SPT of stiff clay was 24.65 blows/ft. The results of Bangkok subsoil profile, undrained shear strength and standard penetration test terms of contour lines were only showed the trend of parameters. The value of parameters were interpolated value. This research aims at using of geographic information system to apply in soil engineering field. The results of this research can not be referred because some areas vary in soil condition and the borehole's scattering are not cover in partial areas. To calculate in soil mechanics, should have a new soil test.