譚義績2006-08-312018-06-292006-08-312018-06-292001http://ntur.lib.ntu.edu.tw//handle/246246/29735本研究利用簡化的黏彈性模式，描述 含水層中粗顆粒礫石沈積物與細顆粒砂石 沈積物交界面處至拘限含水層尖滅端，於 地震力作用下液相之動力行為。假設拘限 含水層中砂石沈積物所在研究區域於震動 時為液相可壓密且孔隙介質不排水狀況 下，將液相及固相耦合的波動方程式分 離，僅考慮液相控制方程式，推導出解析 解，同時套配921 集集大地震中於濁水溪 沖積扇中所觀測到之水井水位變化資料， 獲致良好的結果。本研究亦參照地質井取 樣調查所描繪的水文地質剖面圖，描述921 集集大地震中發生土壤液化地區，與含水 層中粗顆粒礫石沈積物與細顆粒砂石沈積 物交界面處位置關係，據觀察紀錄顯示， 地震所引起之水井水位變化最大處皆位於 含水層中礫石與砂石交界面處，而導致該 區域靠近扇頂部分於地震後數日陸續發生 土壤液化之現象，顯示於大地震中評估土 壤液化潛能，除現有工程評估方法外，還 需考慮工程所在水文地質環境之影響。The simplified visco-elastic model is adopted to describe the earthquake induced dynamic behavior of the liquid phase from the interface between the gravels and the sands to the pin-off in the confined aquifer. We assume the porous media is undrained and the liquid phase is compressible in the sanded confined aquifer during the vibration, and then decouple the momentum equation of the liquid phase to find the analytical solution. The presented model is derived to match the captured data of the high dense network of hydrologic monitoring wells after the Chi-chi earthquake and does fairly well. Consulting the hydrogeological profiles identified from the drilled cores, the highest well water level changes are located at the interface between the gravels and the sands in the confined aquifer and induce the liquefaction at the upstream area in the next few days. The field observation emphasizes the importance of the hydrogeological influences in evaluating the liquefaction potential.application/pdf691320 bytesapplication/pdfzh-TW國立臺灣大學生物環境系統工程學系暨研究所集集大地震水井水位變化黏彈性力學孔隙介質土壤液化The Chi-Chi earthquakeWell water level changesVisco-elasticityPorous mediaLiquefactionreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/29735/1/892116M002053EAF.pdf