应用地电阻剖面法於土壤地层水份变化与SPT-N值比对.PDF

中華水土保持學報, 42(1): 57-66 (2011) 57 Jour nal of Chinese Soil and Water Conservation, 42 (1):57-66 (2011) 應用地電阻剖面法於土壤地層水份變化與SPT-N 值比對 * 馮正一 鄒佩蓉 陳奕凱 鄭旭涵 摘 要 本研究在彰化縣灣雅水保持教室，於三個不同時間點施作地電阻試驗，並採用不同 電極排列方式探討地表下電阻值之變化。結果發現地表下電阻率分佈與鑽探結果接近，且對於 地層水份變化有良好推測結果。本研究亦探討經由鑽探後所得到之N 值與電阻率分布之關係， 其方法採用文獻中提出之轉換公式，主要是將電阻率轉換為橫截電阻率 (transverse resistivity) 後，再比對 N 值之相關性。本研究結果顯示灣雅試區之土層，其土層特性對於橫 截電阻率與N 值之關係有較大的影響。 關鍵詞：不飽和土層，地電阻，SPT ，N-value 。 An Application of Electrical Resistivity Tomography on Water Changes and Correlation with SPT N-Values of the Strata * Zheng-Yi Feng Pei-Rong Tsou Yi-Kai Chen Jero-Hertz Jeng ABSTRACT The tests were performed using various electrical resistivity tomography (ERT) electrode arrangements to discuss the variation of electrical resistivity of the ground at three different periods in Wan-ya, Zhanghua County. The results of ERT measurements are consistent with the drilling data; the changes of water in strata are also well estimated. In addition, the relationships between ERT measurements and SPT N-values are obtained by using an equation proposed in literature. Based on the equation, the resistivity obtained from ERT measurements is converted into transverse resistivity for correlating with the N-values. The results indicate that the characteristic of the strata in Wan-ya has an important influence on the correlation between transverse resistivity and N-value. Key Words: electrical resistivity tomography, SPT, N-value. 染等領域範圍，其特點為可快速獲得大量地層資訊， 一、前 言