The simulation of quantified multi-layered ground subsidence by Time Series Analysis

• Main Authors: Chen, Yi-Hsuan, 陳奕弦
• Other Authors: Su Miau-Bin
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/67645827168125488091

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.