The above approach is used to evaluate the
liquefaction potential of Maesai’s subsoil and to back
analysis for the subsoil layer that is likely to be liquefied.
This information is rather important for the future of the
design building codes of Maesai. The safety factors against
liquefaction of each soil layer were calculated using the soil
data from the boreholes in Maesai. The peak horizontal
ground acceleration (PGA) is considered to be equal to 0.2g
as recorded by accelerometer station of TMD at maesai
(Fig5). However, since the analysis will be done in various
locations depths, the average actual acceleration for each
considered locations and depth is none to be known.
Therefore, considering the amplification effect, the 0.2g PGA
values were used. The MSF is equal to 1.33 for earthquake
magnitude of 6.8. The ground water table obtained from
the boreholes is reported in shallow depth. The boreholes
were drilled before liquefaction occurred. The first SPT-N
value data starts below the top crust layer, therefore the
evaluation was done below this level and also below the
present of ground water table. The clay layer was not
evaluated since it’s considered to be non-liquefiable
material