Floors of hydraulic structures, which are located below the minimum tail-water level or sub-soil water-level or within the range of reservoir effect, are subjected to severe uplift pressures. In view of the magnitude of such uplift pressures, generally it will not be economically advisable to counterbalance it with the weight of the floor slab alone. Instead, the effective weight of the floor slab is increased by anchoring it to the underlying rock. The anchors, in effect, tie the floor slab to a cone of rock, the volume oj which depend,s upon the anchor depth, their spacing and the angle of rupture of the soil. Field tests which were conducted at Beas Dam site to determine the type of anchors to be provided, and other parameters governing their six, depth and spacing are described in this paper.
