A Case Study for Selecting the Type of Jamrani dam (Roller Compacted Concrete Vs. Conventional Concrete) Vishnoi Prashant1, Sant Pratibha Shankar2 1Superintending Engineer, Irrigation Department/GM, UPDCC, Uttarakhand 2Assistant Engineer, Irrigation Department/Project Manager, UPDCC, Uttarakhand Online Published on 21 June, 2022. Abstract A 150.60 m high concrete gravity dam is proposed to be constructed across Gola River at Jamrani, 10 km u/s of Gola Barrage in district Nainital of Uttarakhand under UPDCC (Uttarakhand Project Development and Construction Corporation Ltd.),Uttarakhand. The project aims at providing irrigation to 56951 ha area of Uttarakhand & Uttar Pradesh, providing 117 MLD drinking water to population of Haldwani region and hydropower generation, 14 MW installed capacity. In 1980’s various dam types were discussed and final recommendation by Jamrani Board of Consultants was RCC (Roller Compacted Concrete) dam type which was favoured due to factors like shortage of cement, and problems of disposal of fly ash produced by thermal power plants and freely available within 200 km from plant. However, In the present scenario, procurement of fly ash will pose issues pertaining to both availability and cost of fly ash. In addition, the various factors like requirement of low-level orifices; constraints on achieving the higher tensile strength in RCC etc. Hence, this paper includes comprehensive study on selection of dam type whether Roller Compacted Concrete (RCC) dam or Conventional Concrete (CVC) dam based on quantitative and qualitative comparison between both types. The computations based on dynamic analysis after PSHA(Probabilistic Seismic Hazard Analysis) show that the volume of concrete in RCC type dam is greater than in CVC type by about 4,67,00 m3. As the slope of RCC section is flatter because of higher tensile stresses, the associated quantities are significantly higher. The cost of proposed Jamrani dam sections in RCC & CVC have been compared, the saving in CVC dam worked out to be about Rs. 440 Crores as compared to the RCC dam. On the basis of the above study, dam type has been changed to conventional concrete. Top Keywords Roller Compacted Concrete, Conventional Concrete, Fly ash, Cost. Top |