Abstract:
This paper presents the stability analysis of Tha-ngiw Reservoir,
located in Trang. It began by investigating the data obtained
from the geotechnical instruments installed, including
piezometers, observation wells, and standard rain gauges. Then,
it was used to analyse its behaviour using the finite element
method via Plaxis. The model was created by referring to the
drawings and the actual dimensions in the field at current
conditions. After that, the water level was varied between the
lowest and highest. The results showed that the reservoir is still
intact when the water level was the highest. When the water
level was the lowest because of rapid decrease of water level,
settlements and deformations occur at the front of the reservoir.
These were quite useful for that they can be employed in order
to prevent the damage of old reservoirs. In addition, the results
could be used in the design of a new reservoir so that the rapid
change of water level would not trigger the damage.