Dependency of dry density of soil on water content in the measurement of electrical resistivity of soil

 Chik Z., Murad O.F., Rahmad M.


Density is defined as the weight of soil per unit volume of soil. Often in the construction of different types of structures in-situ 'fill' is required. In-situ measurement of density is vital for such projects. When soil is being used as fill material it is usually compacted to a dense state to obtain satisfactory engineering properties. Dry density of soil basically depends on many properties of soil. For this reason it is difficult to establish an empirical relationship between electrical resistivity and dry density of soil. For similar typ of grain size distribution and dry density of soil, electrical resistivity widely varies with different percentages of water content. In this study dry density of soil was determined using standard proctor test. After compaction electrical resistivity of soil was measured for different dry density of soil. From the graph of volumetric dry density of soil versus water content of soil, a slightly steeper increment in dry density can be observed with increasing water content. On the other hand in the case of dry density versus electrical resistivity graph, electrical resistivity remains almost same for increasing dry density until it reaches to the peak value. After achieving the maximum dry density a detrimental slopes can be observed in the both graphs. In the case of electrical resistivity of soil, after achieving maximum density of soil it does not decrease in remarkable extent. So except some dissimilarity a common trend can be observed in the both of the graphs. In both graphs after a maximum value, dry density tends to reduce. Also in both cases measured maximum dry density of soil was 1.79, 1.936, 1.792 and 1.821 gm/cm3 respectively. So it can be concluded that for both cases electrical resistivity mostly depends on percentages of water in the soil rather than dry density. It is difficult measure dry density of soil from only electrical resistivity. But the maximum dry density of soil can be found from the least resistivity value.


density, electrical resistivity, percentages of water, maximum soil density

Full Text:


Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.