Proceedings of DFI-India 2019: 9th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Capacity of Piles in Pond Ash Based on Model Pile Load Tests
Sreedhar M.V.S., Ph.D. and Dheeraj Ram A. V., M.E.
The electric power requirements of this country at present are primarily met from coal based thermal power, which in turn generates huge quantity of coal ashes as by-product. The un-utilised coal ash is generally disposed in to ash ponds. The ash ponds abandoned after their capacity is reached, are occupying vast areas of land. As these areas are generally not preferred for cultivation, there is great necessity for their utilization. Solar plant installation is one of the ways of utilizing these abandoned ash ponds. In view of the wind induced uplift forces acting on these solar installations, the preferred foundation type is pile foundations. However, it is possible only if the interaction of piles in pond ash is well understood. In view of this efforts are made in this study by carrying out a series of model pile loads tests in laboratory and understand the interaction. The model piles made of cement concrete with mesh reinforcement are installed in to the ash pond test bed and its ultimate capacity is determined by applying monotonically incremented loading. The length of embedment, the density of the test bed and saturation state are studied systematically. The study indicated that, the nature of failure is brittle in pond ash and the effect of other variables is similar to that of cohesionless soils such as Sands. A comparative study is also conducted on sands to have a correlation among different soils. This study gives insights into the behaviour of the pile in the pond ash and itís utilisation in the field.
|article #3306; publication #1059 (India2019)|