台灣近年發生許多轉爐石未被妥善處理的事件，傳統上評估汙染場址的方式為開挖及鑽探取樣，然而這樣的方法既為破壞性，又無法有效獲得大面積地下資訊，地電阻影像剖面法透過選擇適當的電極排列施測，可快速獲得大範圍的地層電阻率影像剖面，在應用於地下掩埋物上也有不少文獻研究，因此若能透過地電阻此一地球物理方法做轉爐石掩埋偵測的協助，將能提供國內相似汙染場址調查上的參酌。
本研究以粉砂土、轉爐石細砂作為研究材料。首先先對材料進行物性試驗及電性試驗以了解性質，其中，電性試驗以四極法搭配含水量試驗，利用Archie’s Equation建立電阻率-飽和度擬合關係式，比較兩材料在電學性質上的差異，再以一維反算設計最適當的砂箱配置，砂箱試驗上研究了3 Layers、2 Layers、Single block三種配置，分別探討在垂直向（3 Layers、2 Layers）及水平向（2 Layers、Single block）上，地電阻影像剖面圖的不同處，並搭配四極法量測表層電阻率值，用以驗證地電阻數值的正確性，最後再以二維正算模擬理想均質狀態下的電阻率成像，跟實際量測地電阻剖面影像相比較，來做檢討及分析，以評估用ERT偵測轉爐石位置之可靠度，試驗結果主要如下：
(1) 就本試驗材料電阻-飽和度擬合結果來看，兩材料在近似含水量下，單就電阻難有辨識性。
(2) 電阻-飽和度擬合曲線可用以檢查後續試驗數據合理性，不同的材料擬合方程式不盡相同，但能確定Archie’s Equation在質性上電阻值和飽和度為指數反比。
(3) 本研究砂箱試驗有兩種可能誤差原因，一是電流源非點電源，二則為邊界效應。

In recent years, there have been many incidents in Taiwan where slags have not been properly handled. The traditional method of assessing contaminated sites is excavation and drilling. However, both methods are destructive and ineffective. On the other hand, electrical resistivity tomography (ERT), which is one of the geophysical prospecting, can obtain a wide range of resistivity tomography effectively. In this case, the study attempted to use ERT to detect buried slag, which could be able to provide reference in the investigation of similar sites.
This study uses silty sand and slag as the research materials. First, we used 4-pole method to establish the resistivity-saturation fitting curve to compare the electrical properties of the two materials. Next, we designed the most appropriate sandbox configuration with one-dimensional inverse calculation. Then, we did ERT test on three sandbox configurations. Finally, we used two-dimensional positive calculation to evaluate the rationality of the results. The principal conclusions are as follows:

(1) According to the resistance-saturation curve fitting results, the electrical properties of silt sand and slag are similar. Under the same water content, it is difficult to distinguish from the electrical resistance alone.

(2) The resistance-saturation fitting curve can be used to check the rationality of the subsequent test data. The fitting equations for different materials are not the same. However, it is determined that the resistance value and saturation of the Archie's Equation are inversely proportional to the exponential value.

(3) There may be two major errors of the sandbox experiment. One is that the penetration depth of electrode is close to the spacing, which causes the current sources are not in the form of point sources. The other one is the boundary effect. In this study, the array length is too close to the sandbox wall, which leads to measurement errors.

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