STUDY OF GRAVITY DAM WITH ROLLED CONCRETE

Abstract

roller compacted concrete or rolled concretes comprises placement of low cement no-slump concrete in thin layers compacted by vibratory roller in continuous series of operation without the interruption and discontinuity of conventional shuttered transverse joints. The roller compacted concrete can be placed as hearting or central core between upstream and downstream facings provided. either by conventional form work or slip formed method; or precast block concrete. The method enables large savings through use of low cement content, no-slump concrete, use of high fly ash content in, the mix and significant reduction in the cost of construction to the extent of 5O:, depending on the size of the dam. In the present study the proper-ties of rolled concrete in dams, and 'constructiontechniques required for placement along with the equipment needed and mix proportioning are des-cribed. In this dissertation, the finite element analysis of a conventional concrete dam and a mcdified section using rolled compacted concrete at core and richer concrete at the upstream and down stream faces has been carried out. A finite element mesh has been judiciously selected by using an automatic mesh generation program so as to strike a bargain between accuracy and economy, For a 150 m high concrete darn, four different types of sections have been analysed for gravity, hydrostatic, uplift, silt, and quasi-static earthquake loadings. Detailed plots of defomations, stress contours and vectors have been obtained to study the behaviour of 150 m high concrete dam sections. Various factors resulting in over all economy are enumerated. These enable us to high-light the economy affected by the use of roller compacted concrete. Finally the scopefor future work in this area has been indicated.