Study on Groundwater Table Variations Induced by Earthquake, the Chi-Chi Earthquake Induce.
Date Issued
2007
Date
2007
Author(s)
Lai, Yueh-ting
DOI
zh-TW
Abstract
The Chi-Chi earthquake truck Taiwan in 1999, not only caused casualties, house collapses, slope failures, but also caused many liquefication in the Choshui alluvial fan.
The abnormal change of groundwater level has often accompanied earthquake incidents around the world. During the Chi-Chi earthquake, a network of groundwater monitoring wells located in Choshui River alluvial fan near the west side of Chelungpu fault recorded the abrupt changes of groundwater level which clearly showed the effect of this major earthquake.
In order to understand the relation of the pore pressure change of the aquifer subjected to qarthquake, this study used finite-difference software, FLAC, to construct the conceptual model of the pore pressure dynamic response pattern. The ground stratigraphic section data of the groundwater monitoring wells and reasonable simplify cation of soil layer to were used in analysis. The ground acceleration records of the Central Weather Bureau in the Choshui River alluvial fan, and records at the groundwater monitoring wells were determined by way of the interpolation. The deconvolution analysis were performed SHAKE to get the earthquake acceleration time histories for the base input of the groundwater monitoring wells.
Comparisons of the analysis results with the groundwater level record obtained during the Chi-Chi indicated that the result of east-west seismic wave compares the north-south seismic wave as the numerical model input basis obtained outstanding, and its result and the actual groundwater level change tallies, also with overall tendency consistent, therefore the simulation result is quite good.
Subjects
地震
地下水變化
動態反應
動態孔隙水壓
earthquake
groundwater change
dynamic response
dynamic pore pressure
Type
thesis
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