n Journal of Emerging Trends in Engineering and Applied Sciences - Characterization of erodibility using soil strength and stress-strain indices for soils in some selected sites in Anambra State

Volume 4, Issue 2
  • ISSN : 2141-7016
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The purpose of the study are to develop models for predicting the susceptibility or extent of soils to erosion in the selected sites in the state; to measure and observe the relationship between soil strength indices, stress-strain characteristics and changes in moisture content (mc%) and dry density (γ) for some selected soil samples in the state; to obtain the jet index (J) for the various soil samples and to investigate the relationship between soil strength indices or stress-strain characteristics on the erosion resistance of compacted soils. In this study, initial soil strength indices (q) and stress-strain characteristics namely failure strain (ε); area under the stress-strain curve up to failure (I) and stress-strain modulus between no load and failure (E) were investigated as potential indicators for characterizing the erosion resistance of two compacted soils namely sandy clay loam (SCL) and clay loam (CL) in some selected sites in Anambra State, Nigeria. The unconfined compressive strength (used in obtaining strength indices) and stress-strain measurements were obtained as a function of moisture content in percentage (mc %) and dry density (γ). Test were conducted over a range of 8% to 30% moisture content and 1.0g/cm3 to 2.0g/cm3 dry density at applied loads of 20, 40, 80, 160 and 320kPa. Based on the results, it was found out that initial soil strength alone was not a good indicator of erosion resistance. For instance in the comparison of exponents of mc% and γ for jet index or erosion resistance index (J) and the strength measurements, q and E (Table 7) agree in signs for mc%, but are opposite in signs for γ. Therefore there is an inconsistency in exponents making it difficult to develop a relationship between the strength parameters and J for this data set. In contrast, the exponents of mc% and γ for J and ε and I are opposite in signs (Table 7), there is potential for an inverse relationship. The measured stress-strain characteristics however, appeared to have potential in providing useful information on erosion resistance. The models developed for the prediction of the extent or the susceptibility of soils to erosion and subjected to sensitivity test on some selected sites as shown in table 8 achieved over 90% efficiency in their functions. Finally, the contributions to knowledge are the models developed for all the sites in the state that can be used to easily predict the susceptibility or extent of soils to erosion.

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