| Summary: | 碩士 === 國立中興大學 === 土木工程學系 === 85 === Economy in Taiwan develops rapidly, in recent years. At
the same Time,demands for water resources are increasing, people
turn to use groundwaterfor it is cheap and qualities are stable.
Thus, the groundwater level in south-western area descends fast
and making the land subsidence disaster very serious. The method
that can estimate amount of subsidence using thegroundwater
level change is very important from the point of view land
protection. The data of goundwater table change and
settlement measured at different depths from the monitoring
station , are collected to build up the correlationbetween the
change of effective stress and settlement . The division of
aquifer system and soil layers are judged transfer function
between each monitored water head and by comparison of soil
layer. Then, the hydrogeological system is set. Finally ,
it is found that: (A)The transfer function method can analyze
the settlement of multiple layers reasonally , and get good
result in simulating land subsidence. (B)According to transfer
functions founded in kthe analysis, when effective stress stop
changing , settlement changes gradually to stop . (C)Using the
value of Cv=0.0466cm^2/sec can match field settlement data and
the soil behavior more assemble to clayey silt.
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