This paper deals with some aspects of the air entrainment process along the chute of spillway and study of pressure fluctuations. The experimental study has been carried out using stepped spillway model located in the campus of Government College of Engineering, Amravati (India). It is observed that air concentration is increasing with discharge as well as with number of step. Air concentration is increasing along the length of spillway. It is also observed that the bottom mean air concentration increases with step height in the upstream reach of stepped spillway, which is prone to cavitation. The pressure profiles exhibit a wavy pattern down the stepped chute and pressure on each step increases with ratio of critical depth to step height (yc/h).
Soil stabilization has become useful solution to treat the weak soil to achieve the required engineering properties. Soil stabilization by adding materials such as cement, lime, bitumen, etc. is the effective method for improving the geotechnical properties of soil which have been applied for many years now. This work is intended to study the effect of adding nano-copper on geotechnical properties of black cotton soil i.e. liquid limit, compaction characteristics, unconfined compression strength, CBR value and swelling pressure. Nanocopper was mixed with soil in three different percentages (i.e. 1, 1.5 and 2.5 % by weight of soil). The optimum nano-copper content found to be 1.5 % for attaining the maximum strength.
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