Correlations between Compression Index and Index Properties of Undisturbed and Disturbed Tehran clay     

Akbarimehr  Davood  Eslami  Abolfazl  Imam  Reza 《Geotechnical and Geological Engineering》2021,39(7):5387-5393

The compression index (Cc), which is used to calculate the consolidation settlement of fine-grained soils, can be determined through consolidation testing. Given that exploring the soil in a local region is highly important to determine the correlation between the Cc and other soil indices, the present study investigated these correlations in undisturbed and disturbed samples through 130 consolidation tests and determining the Cc of Tehran clay. The results are suggestive of the validity of the linear correlation between the Cc and the unit weight and initial void ratio of the soil, with several relations presented to estimate the Cc of Tehran clay soil. In contrast, the initial water content, liquid limit and the plasticity index do not produce reliable correlations with the Cc of the local clay soil, and a relation based on these index parameters cannot be recommended in this area. Further, the presented empirical correlations were compared with the existing ones. More over time-displacement and e-log σ’ graphs for undisturbed and disturbed samples are compared and stress history of the site are presented. The results are significant in terms of engineering applications, saving time and money and provides an initial estimation of compression index.

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Erratum to: “Impact of season and road on stream crossings and river water quality in Darabkola,Hyrcanian Forest”     

Mananeh Akbarimehr  Seyed Ataollah Hosseini  Fatemeh Shariati  Seyed Mohammad Hodjati 《Water Resources》2017,44(1):167-167

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Impact of season and road on stream crossings and river water quality in Darabkola,hyrcanian forest     

Mananeh Akbarimehr  Seyed Ataollah Hosseini  Fatemeh Shariati  Seyed Mohammad Hodjati 《Water Resources》2016,43(2):369-376

Nutrients are important building blocks for healthy aquatic ecosystems and are generally nontoxic; but they can change with alteration in environmental parameters. The main objective of this study was to consider the seasonal variability of NO ₃ ^– , PO ₄ ^3– and total suspended solids (TSS) concentrations in water. The study sites, stream crossings (L30, L15) and river (R), are located in the hyrcanian forests, district 1 of Darabkola forest. The sampling was conducted in winter and spring. Water samples were taken into plastic bottles, labeled, and carried out to the laboratory for NO ₃ ^– , PO ₄ ^3– and TSS analysis. T-test results showed that there was a seasonal change in nutrient concentrations (p < 0.05) except for NO ₃ ^– concentration at L30. Also, there was no significant seasonal change in TSS concentrations at all stations. Pearson correlation analysis did not reveal the same trend. Further analysis showed that the effect of road age on water quality parameters was statistically significant for PO ₄ ^3– in spring and winter. Atmospheric precipitation plays vital role in nutrient loss and increasing concentration of suspended sediment. To prevent soil erosion from activities and discharge of wastes in the vicinity of river and stream an effective management should be planned and enforced.  相似文献