Moreover, The summary of the liquefied soil
informations and the related calculations are presented in
table 1. It is found that the liquefied soil may have been
generated at 3.5 -11 m depth within the loose to medium
dense sand layers where SPT-N values are lower than 17
blows/foot.
By plotting the analysis data into Seed’s curves ([5]), it
can also be seen that the liquefaction data in Measai
located in the liquefied zone in which coincided with the
actual condition (Fig 7).
The liquefaction probability of sand layer that has F.S.
less than 1.0 are calculated to be about 75 to 95% which in
range of very likely to liquefy-almost certain (class 4 to class
5) classified by [8] (table 2.). Furthermore, The relationship
between probability of liquefaction and factor safety in
Maesai region, Chiengrai province can be expressed in Fig.8
and can be expressed in equation(6).