應用食鹽水檢層法於九份二山崩塌地地下水特性之研究

Characteristics of Groundwater at Chiufenershan Landslide Area by Salt Logging Method

陳明杰(Ming-Chieh Chen) ； 曾俊偉(Chun-Wei Tseng) ； 周明德(Ming-Te Chow)

《中華林學季刊》 37卷3期 (2004/09) Pp. 269-281

https://doi.org/10.30064/QJCF.200409.0003

摘要

本研究為瞭解九份二山潛在崩塌地之地質構造以及地下水特性，於研究區域坡面選擇六個位置進行地質鑽探調查，並於鑽孔內實施食鹽水檢層。每一鑽孔深度45m至60m不等。經地質鑽探岩心取樣研判，主要地層構造為棕黃色及灰色砂岩偶夾薄層頁岩，剪裂帶出現在深度40m至50m，與地震造成崩塌坡面的深度一致。其次，經食鹽水檢層結果，地下水的比電阻基準值不一致，地下水流動可區分為確定流動與潛在流動型態。由於試驗期間降雨量少，地下水位相當低，經食鹽水檢層結果研判，地下水層為上位含水層，尚無法檢出其確定位置，而且，含水層為非拘限含水層。而地層之剪裂帶為地下水流出位置。

關鍵字

九份二山 ； 食鹽水檢層法 ； 地下水

並列摘要

Landslide area at Chiufenershan, Nantou county, was surveyed by using geological boring and salt logging method in order to understand the characteristics of stratum and groundwater. Six locations were selected to carry on the geological boring investigation. Each boring well depth was 45 m to 60 m From the geological boring core sample, the main geological stratum was brown and gray sandstone, and the thin layer shale appears occasionally. Also, shear rupture zone appeared from 40 m to 50 m depth, which was consistent with the slope failure depth induced by Chichi earthquake. Besides, the background value of groundwater specific resistance of the six wells was inconsistent, which showed groundwater of the six wells was divided into definite and probable flowing type. Groundwater aquifer upper the water table was not detected by salt logging test in the condition of lower water table because of little rainfall occurred in research period. Also, the groundwater aquifer of six wells was unconfined. The shear rupture zone of stratum was the position of groundwater flowed out.

並列關鍵字

Chiufenershan ； Salt logging method ； Groundwater