應用地電阻剖面法於土壤地層水份變化與SPT-N值比對

An Application of Electrical Resistivity Tomography on Water Changes and Correlation with SPT N-Values of the Strata

馮正一(Zheng-Yi Feng) ； 鄒佩蓉(Pei-Rong Tsou) ； 陳奕凱(Yi-Kai Chen) ； 鄭旭涵(Jero-Hertz Jeng)

《中華水土保持學報》 42卷1期 (2011/03) Pp. 57-66

https://doi.org/10.29417/JCSWC.201103_42(1).0006

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。

關鍵字

不飽和土層 ； 地電阻 ； SPT ； N-value

並列摘要

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.

並列關鍵字

electrical resistivity tomography ； SPT ； N-value