范正成臺灣大學：生物環境系統工程學研究所林昱汶Lin, Yu-WenYu-WenLin2007-11-272018-06-292007-11-272018-06-292006http://ntur.lib.ntu.edu.tw//handle/246246/55998本研究以滲流槽模型試驗，模擬南投地區之地下水水質對邊坡崩塌及崩落型土石流發生之影響。試驗土樣採自南投縣信義鄉神木村及豐丘村之土壤重模製作75˚邊坡至滲流槽內，經供水設備由滲流槽一端控制水頭高度，促使土體試樣邊坡產生破壞，並同步蒐集水質資料及記錄土體變位，藉此分析地下水水質與邊坡破壞之間的關聯。 試驗結果顯示，土體變位與土體下游處之滲流水電導度值及硫酸根離子濃度有非常顯著的相關。當土體破壞時，土體下游處滲流水電導度之門檻值為39.2µs/cm，而土體下游硫酸根離子濃度之門檻值為9.98mg/L。利用土體下游電導度值與土體垂直變位及水平變位迴歸分析，決定係數各為0.7220及0.8252，這表示以土體下游電導度值推估土體變位具有不錯的預測效果。The objective of this study is to investigate the relationships among the occurrences of landslides, slump type debris flows and the quality of groundwater in Nan-tou area. Soil samples for the tests were collected from Shen-mu and Fen-chiu in Nan-tou to prepare for the remodeled test with slope of 75˚ in a specially designed seepage tanks. A water supply system was used to control the pressure head to cause soil slopes to be failed, quality of groundwater and displacement of the soil sample were collected at the same time. The tests were then conducted to investigate quality of groundwater while the soil slopes failed. The testing results showed that there is positive correlation among the concentration of EC and SO42- of the seepage water at downstream of the soil slopes. While the soil slopes failed, the threshold value of the concentration of EC and SO42- of the seepage water at downstream of the soil slopes were 39.2µs/cm and 9.98mg/L. The coefficient of determination among the vertical displacement of soil, horizontal displacement of soil and the concentration of EC of the seepage water at downstream of the soil slopes were 0.7220 and 0.8252, it means that the displacement of soil can be predicted by the concentration of EC of the seepage water at downstream of the soil slopes.目錄 一. 前言 - 1 - 1-1 研究背景 - 1 - 1-2 研究動機 - 1 - 1-3 研究目的 - 2 - 1-4 研究內容 - 3 - 二. 前人研究 - 4 - 2-1 邊坡崩塌之因素 - 4 - 2-2 滲流對邊坡破壞模型試驗之相關研究 - 7 - 2-3 地下水水質變化與土體破壞之關聯 - 10 - 2-3-1 地下水對土體之化學作用 - 10 - 2-3-2 地下水離子濃度之觀測 - 11 - 2-3-3 地下水離子濃度變化之因素 - 16 - 三. 研究方法 - 18 - 3-1 研究區域簡介 - 20 - 3-1-1 地理位置 - 20 - 3-1-2 區域地質 - 20 - 3-2 研究區域之土樣採集 - 23 - 3-2-1 選擇採樣地點 - 23 - 3-2-2 現地採土 - 26 - 3-3 土壤基本性質實驗 - 26 - 3-4 室內滲流槽試驗 - 29 - 3-4-1 試驗理論 - 29 - 3-4-2 滲流槽設計 - 30 - 3-4-3 滲流槽改良 - 34 - 3-4-4 試驗流程 - 35 - 四. 結果與討論 - 48 - 4-1 水頭高度 - 48 - 4-2 土體變位 - 51 - 4-3 滲流水電導度分析 - 51 - 4-3-1 電導度趨勢 - 51 - 4-3-2 土體變位和電導度變化量之相關分析 - 60 - 4-3-3 3號電導度變化量之門檻值 - 67 - 4-4 滲流水離子濃度分析 - 70 - 4-4-1 離子濃度趨勢 - 70 - 4-4-2 土體變位和離子濃度之相關分析 - 84 - 4-4-3 土體下游硫酸根離子濃度之門檻值 - 85 - 4-5 土體變位量與電導度變化量和離子濃度之關聯 - 88 - 4-5-1 3號電導度變化量和硫酸根離子濃度之相關性- 88 - 4-5-2 土體變位量和3號電導度變化量之迴歸曲線 - 93 - 五. 結論建議 - 99 - 5-1 結論 - 99 - 5-2 建議 - 100 - 六. 參考文獻 - 101 -en-US邊坡破壞地下水水質門檻值迴歸分析soil slopes failurequality of groundwaterthreshold valueregression analysis[SDGs]SDG6thesis